1/4-20x3/8 Small head bolt
thingiverse
I required a lightweight 1/4-20 bolt for my quadcopter and found an ideal solution in mike-linus's threading tool. I am thoroughly impressed with its functionality! A big thanks to Mike. After getting the hang of it, this tool is really cool. Now, how about creating socket cap screws? Customized version of http://www.thingiverse.com/thing:193647; created using Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=193647. Note that printing it in high quality, with 2 shells and 50% fill, works best. Standard quality settings may not do justice to this design.
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