3D Printable line truck for Invert Speargun

Suitable line trucks or blocks are difficult to find and extremely expensive... so I used a commercially available design for the basics and came up with my own.
Whether they are actually going to be strong enough remains to be seen of course...

[@Artiz...]

+Christopher Wahlers (GermanSpearfishingChannel) Just an idea really Chris... for the load which they need to take 3D printed versions are very unlikely to work... especially with no ball bearing implied...