Knuckleduster and Bottle Opener in One!
thingiverse
This clever device serves as both a knuckle duster and a bottle opener. To print it successfully, I use a layer height of 0.3mm with three perimeter layers and 30% infill density. If you want to speed up the printing process, you can lower the infill level. However, for optimal strength, it's recommended that you maintain at least three perimeters. Additionally, this design is somewhat oversized for my average-sized hand, so unless you have large hands, I suggest scaling it down by approximately 10% for a comfortable fit.
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