Designed for use with pocket hole screws (such as Kreg pocket hole screws or their alternatives) or pan/washer head machine screws. (V1 was designed for use with countersunk wood screws but that may split some 3D printed parts with weak layer adhesion)
Holes are 4.3mm with 9.4mm counterbores designed for 4mm screws with up to 9mm screw heads.
Enjoy!
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