Droppy Micro
thingiverse
A versatile servo dropper ... perfect for any application, even as a secure lock. It accommodates most mini servos. I recommend printing it with 100% infill and double-checking that the holes aren't too constricted, just in case you want to tap them with an M3 male tap. This design fits most mini servos measuring 23mm in size, but if you're looking for a safer bet, consider using the same servos I'm using - check out this link: https://goo.gl/l643wk
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