M3X35 Counterhead Bolts
thingiverse
M3X35 Counterhead - Hex, Phillips, Flathead Bolts. I heated a flathead screw bit and then melted the flathead slot with that. I have done this process to increase the control over the screw because if you try to print it directly in the size of the bit, the screw head bends and you can't tighten the screw.
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