20mm test cube sling shot
thingiverse
The ultimate way to get rid of all the failed 20mm test cube prints. Just but your new sling shot next to your makerbot and keep practising while printing along. Instructions Screw to M3 caps into the wholes and add the rubber band. I used the thick variety which is also used when sealing jam glasses. Cut it and super glue the ends around the caps.
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