Zheng Penny Mortar Fat Nock
by AMS3000, published
I had trouble printing the nock part of the very cool zheng3 Penny Mortar, so I popped it into Tinkercad and fattened up the walls in the trouble area (the hole where the band goes through).
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Print and use in the place of the normal nock on the Penny Mortar ( http://www.thingiverse.com/thing:24556 ) if you have trouble printing it like I did. Slic3r just kept leaving gaps on the walls of the hole in the original nock, and the part split in two.
I printed it on my Printrbot with 3 perimeters and 40% infill.