How to cut up and key models in Blender for 3d printing
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- เผยแพร่เมื่อ 8 พ.ค. 2021
- PLEASE NOTE: This booltool method does not always work. A newer version of this video that does not use bool tool is here • Blender. How to cut an...
Tutorial on how to cut 3d models into separate parts and key them in Blender. This parts handles simple plane cuts. Part 2 will show more complex organic cuts. Edit: Please note this technique does not work reliably in 2.93 or 3.0.
Second part of this video is here • How to cut up and key ...
Blender for 3d printing facebook group / 1371247373254645 - แนวปฏิบัติและการใช้ชีวิต
When i apply the slice, instead of splitting the object into 2, the plane gets shaped according to the object's width and the object doesnt cut
This is due to the latest versions of bool tool. Can I suggest you look at my updated version of this video which is here th-cam.com/video/j5at2x0CcX8/w-d-xo.html It has better sound too :)
i had been looking for this tool since 2 hours, such a relief after finding it from you man, thanks a lot. i came to know that almost no one tals about bool slice in entire youtube except you.
Really good to hear this is useful! I would remind you that booltool doesn't always work as expected for this on later versions of Blender. In the description of this video I have a link to another video that does the same thing but without booltool if you find you need it. Thanks again for the feedback!
thanks so much!
simple and direct tutorial
Thanks for feedback!
Very useful lecture , thanks for sharing)
Hope u can make many tutorial like this. Really helpfully for my project workflow , best quick tutorial, thankyou !!
Thank you. I do have a plan to do some more soon.
Nice work, thanks.
Thanks for the feedback!
Well done 🙂
Thanks. First one is always likely to be a bit weird.
Its not weird at all :) I am impressed :)
Nice video help me alot
Pleased to hear it.
I coulnd't find the edit>slice menu at the side.
top left bar edit-preferences...-add ons search bool tool ✔
Thank god I was STRUGGLING 💀💀
Oooh, that's what slice means. I was using a flattened cube for difference modification
Yes but it doesn't seem to work if you have a mass of geometry in your slicing model. Then you need to use the boolean modifier. Part 2 of this video will show how.
What i am facing the huge issue with is when i bisect if the model is a bit complex it will select vectors on its own and i cant deselect them. i need to be able to cut Z axis to equal pieces so i can later cut with CNC. You were close to explaining that at 2:42.. Cant find a better free slicing tool and this one is killing me for weeks now.
I think this might be a simple misunderstanding here. We are basically taking one object to cut through the other object by using a boolean. It can't select any other vertices regardless how complex the model is. It CAN get messed up if the geometry is a bit messed up though. If you can find a way to make your blend file available I would be interested to look at it. If that isn't possible perhaps you can post screenshots/video in the "Blender for 3d printing" Facebook group facebook.com/groups/1371247373254645 I will see it there. Finally you might want to look at the updated version of this video here in case it helps th-cam.com/video/j5at2x0CcX8/w-d-xo.html
Hi There
Great video.
I don't know why but when I cut the model the other half desapears.
Any reason in mind why that is happening?
Yes I do :) The booltool add-on does not work reliably in later Blender versions. If you are interested, I have a similar video that should work for you as it doesn't use booltool. Hope this helps! th-cam.com/video/j5at2x0CcX8/w-d-xo.html
Nice tutorial, thank you. I have a problem, I want to cut a cube but when I use Slice delete one of the pieces. Why? What have I done wrong? Thank you
Newer versions of booltool don't work correctly. Try this updated tutorial. This should work th-cam.com/video/j5at2x0CcX8/w-d-xo.html
@@notverygoodguy Thank you
Hi, I'm following these steps but for some reason after I slice, half the model just disappears. I checked and its not hidden, its just gone. Any clue on why?
I usually use the bisect tool to make cuts but I am trying to use the plane to get a perfect 90 degree cut.
Thanks
Disregard, I found the link to your updated video. Thanks! Video saved me alot of headache
@@goose1498 Glad you found it and thanks for the feedback!
I am trying to follow along with this on an STL model I imported, trying to cut an arm off - when I perform the slice step I only get the top part of the model and the slice thru the arm. If I slice a cube, I get both parts after the slice. is there any prep needed for importing an STL before you perform the slice ?
Thanks.
There are many things that can cause this but usually it is because the origin is in the wrong place or scale and rotation needs to be applied. It can also be if the normals are all wrong. Apply scale and rotation by going Object->apply->scale and rotation. Set the origin to the correct place by going Object->origin->origin to geometry. If you want to check the normals check out the video I am about to upload :)
@@notverygoodguy Thnks - just checked that one out - also the 2nd one also on cutting more organically - still seems to be working incorrectly for me - _ total noob - just want to hack off an arm and add some Keys ;)
when slicing With the plane obviously there is a red and a blue side. eveything on the red side gets cut and disposed of. the blue side is kept.
I have tried this a number of times and getting weird results. Even tried the bog standard cube v plane and still get the red side cut.
@@StravidesUk same issue
@@StravidesUk Any chance you can make your .blend file available somewhere? I would like to take a look.
@@averygoodyear1255 Same for you, if you can make your .blend file available, I'll have a look and see if I can spot the issue.
How do you get the bool tool enabled if you don’t have it on
Edit->Preferences then select "Add-ons" from the left hand pane of the preferences window that pops up. Then type bool tool into the search box near the top right of the preferences window. The bool tool addon option should appear as "Object: Bool Tool". Select the check box and then close the preferences window. However, booltool doesn't always word when using later versions of Blender so you may want to look at the updated version of the video that doesn't use it, th-cam.com/video/j5at2x0CcX8/w-d-xo.html
G'Day.
I too am loosing one side of the slice similar to William Everhart. I have double checked the Rotation and Scale and also Face Orientation but i still loose one half of the slice. Any other suggestions would be very much appreciated.
Is there any way you could make available your blend file? Maybe I could look at it. I would like to update this video with any weird things like you are seeing (and with better audio :) )
Additionally you might try setting origin to geometry. Remember that scale/rotation need to be applied to both the model and the plane you use for cutting
I have Version 2.93. That probably is my problem. Thanks for your help. I look forward to your updated versions. Thanks again. Cheers.
@@alanaston5010 In the meantime look at my reply above which gives a way of handling in 2.93 by basically doing the operation twice. One time to get one half of the model and the second time to get the other half.
New version that doesn't use booltool here th-cam.com/video/j5at2x0CcX8/w-d-xo.html
I get from this video that the built-in "bisect" function is not able to split an object with a plane, but only with a hand-drawn line, which is not really precise. In order to slice an object one needs a plugin? The audio is quite low and you didn't show the name of that plugin...
The bisect tool can can cut an object but only in straight lines and as you say not with precision. Most 3d printer slicers can do that anyway.
The audio is not good in this video I agree though to be fair it was my first video :) There is a link in the description of the video to an updated version which has better sound and doesn't require the booltool plugin. I'll post the link here in case you would like to see that.
th-cam.com/video/j5at2x0CcX8/w-d-xo.html
When I slice it deletes the back half of the model, how do I do this without that happening?
It may be either the model has inverted normals (check by turning on the "show faces" option) or you have not applied scale and rotation but most likely because booltool is not reliable with some versions of blender. You could try this video which does the same thing without using booltool. th-cam.com/video/j5at2x0CcX8/w-d-xo.html
Hey I just want to say thank you i’ve been using it for about a week but I’m having trouble every time I do a slice the other half completely disappears
Also how can I make multiple slices on one piece
The booltool addon started doing this sometimes in later versions of Blender. I updated the video to a non-booltool version if you are interested. This should work but please let me know if it doesn't th-cam.com/video/j5at2x0CcX8/w-d-xo.html
@@notverygoodguy thank you I’ll try it tomorrow morning
@@justinguzman5308 You can just do the same operation again or you can have several planes as different objects or you could create several additional planes in edit mode and use them as if they were one object and do all your cutting at once :)
@@notverygoodguy got it imma watch that video soon so I can continue to cut and make with my 3D printer
Ok, this is weird. I followed every word you said to a T, but when I do the slicing part and try to move the object (model car body), the plane stays affixed to the object. 🤷🏾♂️
Is there something I’m missing? What’s also strange is the body doesn’t get spilt into two, but it separates actual body parts. Front fenders and one of the doors.
I’m new at this and I have no idea what’s happening wrong.
Firstly, I would suggest looking at the updated version of this video that doesn't use booltool here th-cam.com/video/j5at2x0CcX8/w-d-xo.html booltool can introduce some problems. Secondly did you model the car yourself or did you download the car model? Many car models I have seen are designed to render nicely but the geometry is all over the place with parts that are actually inside out and they are often made of many objects that are not actually connected. Booleans often do not work in these circumstances. If you can provide a link to the model or your blend file, I could take a look at it if you like.
@@notverygoodguy
Thanks for the response…..I’ll take a look at the video. The STL file was downloaded from here……
3dprintable.shop/product/maserati-ghibli-coupe-1967-printable-body-car/
I was able to see the vertices in Blender on one particular mode, and they looked quite fine and organized. I’m a novice at this, so what may appear OK to me, may be riddled with issues to someone else that has more experience.
Let me know what you find…. if all else fails, I’ll simply get a larger printer down the road to print the whole thing out. ☺️
Thanks again!
@@plastiksurgeon9129 It's late here so I will look into this tomorrow :)
@@notverygoodguy Thanks! 👌🏾
@@plastiksurgeon9129 OK, I haven't actually downloaded this model as it is a paid model but the description suggests it is supposed to be printable. There is no reason this method should not work, even if it is a shell. I presume you are just trying to cut this car in half or something. The issue you describe is typical of two things. Either the normals being the wrong way around or scale and rotation not being applied but if this an stl, I would imagine the normals to be correct. If you are just cutting it in half you could perhaps more easily do it with the Blender bisect tool or in your slicer. Prusa slicer is pretty good at it.
any pointers for how much adjustment needed for the hollow cube? it was .6 for the potruding box then you changed it to .8 to the hollow part. is it always +.2?
It really depends on your printer. For a well calibrated FDM printer +.2 should be OK though remember this becomes only .1 space on each side of the cube so it can easily be too little. Maybe .3 is a better average. For resin printing I would recommend a bigger gap as the resin is likely to shrink somewhat during curing and how much it shrinks depends a lot on how you cure it and the type of resin.
In the end +2 or +3 usually works for me and +4 for resin. That said, the cube approach does not work so well for me with resin but just pulling out the middle of the "cutting plane" as shown in this video works more reliably.
Maybe I should do a video explaining these and demonstrating the difference.
@@notverygoodguy im currently using resin and it hurts everytime my print fails bec of the 30 degree adjustment, im using a lot of supports by printing the entire model that i made so instead im thinking of cutting it in parts and print it on the plate and use the entire plate instead of having it focused on one single part which i imagine swings once the support snaps. id also get a free hole with the cube lock part which is automatically hidden upon assembly.
im using halot, just a ff up, ive read some articles that resin do expands, so from ur end +3 ( 1.5 each sides) do the job right? so just the thickness of the cube regardless of the orientation. im using water washable btw.
@@playerone6373 I haven't used water washable resins but have heard that they deform more but I would guess +3 would still be OK. If it isn't you can always file it down a bit after curing. You can certainly cut your model to help with print times but if you put the flat side directly on the bed you will need to compensate for "elephants foot" in your slicer. Again though this can be dealt with using a file after gluing the parts back together.
@@notverygoodguy im using raft and supports and tilt 30 on all of my prints just to avoid the elephants foot bec of the initial curing time, waste of resin but i guess i get the quality, i tried to cut my model and just use a potruding part and forgot that i cant see the measurent of it and had to use a box haha, so thats + .3, btw, you didnt revert the box to the first size after adding .2 on your vid?
@@playerone6373 Once the box had been used to make the key and then increased in size to make the hole in the second part it isn't needed any more as long as the boolean modifiers were applied so no need to bother about it.
By the wat, I presume you are hollowing out your model to save resin? If you are and you need to cut and key a hollow model you may want to look at my last video which deals with that.
How did you model the model to be totally solid?
That's an interesting question and I can see that it is not obvious. When you make a model in Blender or much other software you really only model a skin- There is nothing inside. The boolean operation here creates a wall where the cutting tool was. So, after it is cut, you end up with two separate hollow objects but they look solid.
Having said that, if you 3dprint your model, the slicer will assume you don't want it hollow and fill it up with stuff by default.
I hope this makes some sense.
@@notverygoodguy We are actually printing Chess Pieces and I am modeling some Star Trek, and WW2 ship model things for scratch build ships that I make the hulls and decks for scratch.
I use Blender 2.79, and I tend to stay with it because I know it about 50%, LOL.
Usually the 50% that I need and or tend to use for what I am doing.
I am a bit new to the 3D printing though and we are learning on the job and on the fly.
The Boolean tool is a tad different in 2.8/9/3.0
I messed with 2.9 for a bit, but merging double verts is not the same as how 2.79 eliminates them.
I have played with Z Brush but I also use Character Creator and have developed content for CC3/iClone 7.
a lot of it is redundant, and or you can do the same things with Blender that you can do with other programs, and sometimes the other programs are easier, and or superior for certain things.
I own and use 3D Coat for texturing, and you can model in it also, but I haven't taken the time to learn how to model in it, just like I don't and haven't taken the time to texture in Blender.
It looks like Blender can be used that way now though.
It also looks like I could Model, Texture, Render and make a game in UE5 if I, once again wanted to take the time to learn how to do all of that in one program.
All in all I didn't mean to get on a rant.
Thank you for answering the question. Yes it makes sense now. I haven't tried it in 2.79, and I don't think it will work that way in 79, so I might have to transfer models from 79 to 3 to do the cutting operation.
Thanks again. Eldan at Blue Dragon Archery.
@@TwistedSisterHaratiofales It is interesting to hear about all the things you have used. You sound way more advanced in 3d modelling than I am though maybe I have more years of 3dprinting :)
I just downloaded Blender 2.79 to see if my more basic method of cutting and keying would work and it does. I didn't try the booltool mentioned in this video but used the method I have in my later video on cutting and keying . If you look at my later video, exactly the same method works in Blender 2.79. Of course how to add a plane and apply modifiers is not exactly the same but the process is. The later version of my video is here th-cam.com/video/j5at2x0CcX8/w-d-xo.html if you want to try it.
@@notverygoodguy I will look at that, and Thank You.
I have been 3D modeling in Blender for about 14 years, but I started on it because I was writing a book about the ships that Germany had designed but didn't build at the beginning of WW2 so I wanted to make illustrations.
I have since then just started the 3D printing about 6 months back so we can make the parts for our custom quad limb recurve archery bows that I designed.
We are now working on several different designs of chess pieces and sets so we are printing them out along side our bow brackets.
the cutting model issue is because of the Star Trek garage model kits that range up to a 13 foot 1/72 scale Enterprise model that I want to make and build on my You Tube channel.
I plan to make some 6.5 scale ones to sell, and or sell the stl plans.
I am looking at some 3000 to 11000 dollar machines that would make it possible to print larger sections.
Right now I was looking at the design to put it together like a puzzle/model with a hundred pieces or more but the shrinkage and or swelling shifts are going to have to be figured out so we can make a model that is going to fit tight tolerances so it isn't a large number of parts that don't fit together.
Anyway I get to long winded.
TY again for the link and checking that out for me. I am sure I will use it.
@@TwistedSisterHaratiofales You have some interesting projects going on there! I look forward to seeing how they turn out!
after adding the plane I cannot do any kind or resizing. Bool tool should be activated
Can I suggest you try the version of this video that doesn't use booltool. It doesn't work well on some versions of Blender anyway. Try this instead th-cam.com/video/j5at2x0CcX8/w-d-xo.html
What addon is it ?
It is the booltool addon but I don't recommend it any more. Check out this video instead which is pretty much the same thing but without the addon. th-cam.com/video/j5at2x0CcX8/w-d-xo.html
I am using blender 3, it automatically gets rid of one piece of the model I cut with a plane. How does it decide which part to delete?
In recent blender versions the booltool addon often does this and it is pretty random. I reported it as a bug but I don't think anything is being done to fix it. Can i suggest you see this updated video which works in a similar way but doesn't use booltool. I think it will solve your issue :) Feel free to let me know if you have any other issues. th-cam.com/video/j5at2x0CcX8/w-d-xo.html
@@notverygoodguy Thanks a lot for the fast response. I solved my issue with the bool tool but by using a box instead of a plane. I duplicated my model so that I will have multiple sections after the bool operation. I will watch the video for sure to see if that is easier. Thanks.
@@yayser Glad to hear you have a solution!
When I apply the slide, half of my object disappears. What am I doing wrong?
This will most likely be because your normals are not correct or you haven't applied rotation and scale. To check for the normals check "Face orientation" in the viewport overlays (I show this near the start of the video) When you select "Face orientation" your model should go blue and there should be no red. If there is red you need to fix the model because some of the inside of your model is on the outside. If everything is blue then turn off face orientation and apply scale and rotation using the "Object" drop down menu.
I have seen examples where this doesn't work. It looks like a Blender configuration option. I am investigating
Version that should fix your issue here th-cam.com/video/j5at2x0CcX8/w-d-xo.html
When I apply the slide, half of my object disappears. I used blender 2.93.4
This is a bug this version?
I am not sure if it is a bug or if it is intended but I find the same results as you with 2.93 but not with 2.92 when using exactly the same blend file. You can get around this by duplicating your model and doing the operation twice, rotating your plane by 180 degrees in between operations.
That procedure would be to duplicate your model (SHIFT D) and duplicate your cutting plane as well. Then cut the model as described in the video. You will end up with half your model and your plane will be a thin intersection. Delete this original plane. Then turn off your new half a model and turn on the duplicate model and the duplicate plane. Rotate your plane by 180 degrees and repeat the procedure. This will give you the other half of you model :)
@@notverygoodguy Very cool dude.
I think is a bug... because you can rotation in Brush Bolean that in some position is done!
Another thing.... How is plane have only face, it cut the side this normal
Also how said in duplication, make a flip in plane before
@@HervertPimentel I am not sure what you mean with the first part of your question but with the second part you just rotate the duplicate plane. I have found that this sometimes doesn't work either if you are only cutting part of a model e.g. an arm.
I have submitted this as a bug to Blender and am starting to prepare a video that is fairly simple to follow but doesn't use bool tool at all :) Hopefully will post this weekend.
@@notverygoodguy I posted the error on your facebook page! :D
@@HervertPimentel Thank you! That is amazing. It seems to depend on the geometry you have!
seems like the addon is everything but which one...
It is the "bool tool" addon. It comes with Blender and only needs to be enabled in preferences.
Actually you can do the same thing without the addon but it is simpler with it.
none of the menus are displayed on the side of the window, thus I cannot slice :-(
I am guessing that you haven't installed the booltool addon as described. Or, possibly, sometimes after installing a plugin you need to restart Blender. In any case you can get around the whole booltool thing by not using it at all as described in this video th-cam.com/video/j5at2x0CcX8/w-d-xo.html
There is no edit tab on the right where I can find the slice. How can I make that appear?
You need to ensure "bool tools" is enable. Edit->preferences. Select addons and in the search bar, search for "bool" and booltools should appear as an option. Click the check box and you should have the slice option available.
@@notverygoodguy thanks man 😁👍
I just get the plane with the outline on the plane, nothing either side
Is it possible that you are selecting the model first and then the plane? It should be the plane and then the dog. In either case I would recommend using the updated video instead of this one as this method doesn't always work any more. You can check the new one out here th-cam.com/video/j5at2x0CcX8/w-d-xo.html
no matter what I do, using bool tool, or using the Boolean modifier half my model always disappears...
Can you provide a link to your blend file or model? WeTransfer is a good option to send it. I'll have a look at it.
@@notverygoodguy i used the default cube to try out the process. then tried Sphere, a model...same result on everything.
@@richerworldproductions Have you looked at the other video linked in the description of this video? Certainly the default cube doesn't work using the method described here on current versions of Blender (I have submitted a bug report for it). I just tried the default cube on the 3.1 and it works if you use the method without booltool mentioned above.
I think the most likely areas for problems are if somehow your normals are incorrect. I would suggest turning on show "Face orientation" and making sure both your object and "cutting" plane are blue. The default cube definitely works even without increasing the amount of geometry it has so solving the issue with that should solve the issue for everything :)
@@notverygoodguy YES, that other video gave me the results and answers needed. Thank you.
@@richerworldproductions Very pleased to hear that and thanks for letting me know.
and how can we do a toy, i mean.. with moving parts?
For this you are not really looking at cutting up parts though you could I guess. You need to create the links between your parts e.g. a pin that goes through a hole and leave some tolerances for you printer. It is really a special skill set to build articulated models that print in place though,
@@notverygoodguy thnk u very much
非常棒，感谢分享。
Glad it was helpful. Thanks
Iggy💔…
WHAT IS A BOOLTOOL
It's a Blender add-on that you can enable in preferences. However, I no longer recommend using it for cutting and keying so if you want a version of this video that does the same thing but without bool tool, you might want to look here th-cam.com/video/j5at2x0CcX8/w-d-xo.html Good luck!
@@notverygoodguy thanks!! One thing I’m having trouble with now is when I attempt to slice only one side of the object stays and the other is deleted, do you know how to fix this?
@@kitsipher I think you have found the reason I don't recommend using bool tool any more. It can often remove half the model in recent Blender versions. Try the video I mention in the previous reply. I think that will solve your problem but also, make sure you remember to apply rotation and scale for both the model and the cutting plane. If all that doesn't work, try checking face orientation is correct as mentioned in the vids. Let me know how you get on.
Why you killed iggy
No animals were harmed in the making of this video
"make sure the bool tool is enabled" ..not a very helpful explanation for beginners
There are loads of you tube that explain how to enable add ons and one you have seen it once or twice it gets really boring so I tend to leave it out.
Version without bool tool here th-cam.com/video/j5at2x0CcX8/w-d-xo.html
@@notverygoodguy yea i realized how great your video was eventually haha you are the man.
@@alexcastillo4086 You're too kind :)
yo ,,, you never say where to turn on the slicing tool !! ???????????? vidoe is worthless if the tool is not turned on ..
I believe I do mention that you need to have booltool enabled. That said, in the description I mention that booltool does not always work in later versions of Blender so provide a link to a video that doesn't use booltool. In that one there is no need to slice at all. Perhaps you could check that one out. Sound quality is better too :)
@@notverygoodguy i may of used slightly harsh words out of fustration not being able to do it..,, i found out that i would have to pay 3 $ to down load the add on . NO i did not down load it,i know i can do it for free. .. yes please , I would like to watch the video that you are talking about! can you send me a link to it ? ...... I 'm learning blender through random vidoes on you tube .thanks for makeing yours! I'm at the point where i dont know what do i what to get good at.. I would like to print something that people like. So far Rings ( finger rings ) are big hits at work. next im going to try little animals. what do you print that people like?
@@spotless624 Several points there. Firstly, you already have the add-on. It comes with Blender and is only not enabled so you have to enable it in the preferences. As i said though, I now think it is better to do it without the add-on and you can see that video here th-cam.com/video/j5at2x0CcX8/w-d-xo.html
I would recommend you make things you enjoy making as you won't be the only person in the world who likes those :) Jewelry is always a good choice though as if someone likes what you have made you can have it cast in metal which is not as expensive as you might think. I made dogs for a while which dog people bought, but I have also made small shelves with models underneath them which also sold. I also make lamps from time to time. Make what you enjoy.
The worst tutorial ever i cutted and the mesh joined the cube and dindt cutted
Maybe you didn't notice in the description it says this version no longer reliably works with modern version sof Blender? There is a link to an updated version that should work.