Remix of the repeating crossbow by Naus (http://www.thingiverse.com/thing:1848665)

I've modified the initial design, mainly to make it printable without supports. I've also rounded the levers slightly, as well as increased the angle, to give room for proper cocking.

The pins have been thinned to enable snap assembly, though some glue is recommended.

To make it a lot more reliable, I recommend putting a short bit of shrink tubing on the middle of the rubber band, and heating it accordingly.

I've also added an optional finger-holder thingy, so that it's easier to operate- but this is strictly optional.

Zortrax m200

Yes

No

.2 mm

Maximum

Print the arrow holder vertically, with the muzzle towards the print plate. You don't need supports!

Take a piece of thick rubber band, maybe 7cm long. Thread it through a small piece of shrink tubing. Keep the rubber band stretched, and heat the tubing until it tightens around the rubber band. Let it cool before releasing the rubber band.

This will ensure proper release, and minimise the wear and tear on the rubber band.

Modifies with Cinema 4d. Some overhangs rounded out to enable support-less printing, as well as general structural improvements.