I 3D printed yet another nerf gun. The design I used is called "rektify" and is located on thingiverse here: https://www.thingiverse.com/thing:3024361 However it needed some improvements. The biggest problem is that the pusher would strip out the gears in the 90:1 motor gearbox. Then I found an all metal gear version on ebay and that solved the problem. Also I used washers as spacers between the layers around the pusher assembly. Without the washers it gets stuck. Another change was to drill out holes for the pusher motor gearbox mounting screws heads.
These are pictures of the all metal gears motor driver gearbox.
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