Sliding Legolini arrow bolt
thingiverse
3d printed arrow/bolt for "The Best 3D Object on the Planet" brilliant invention by JoergSprave (https://legolini.com/sliding_legolini.php). Inventor introduction video https://youtu.be/iYqMs2Dk4hk Also thanks to the designer of 3d printed version Łukasz Janikowski (https://www.thingiverse.com/jaaanik/designs)
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