ergonomic handle M4 nut/bolt
thingiverse
I simply pull out a piece from the hole to insert ISO M4 nuts. Thanks @TheMakerRob for the original design found at http://www.thingiverse.com/thing:1291805 Print Settings Printer: DAGOMA Discoeasy 200 Rafts: Doesn't Matter Supports: No Notes: You must print the handle on the side, rotating it 90°.
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