Knob for Harbor Freight AC gauge set

thingiverse

So I dropped my gauge set and one of the knobs split and went flying... I tried to glue it back together but it never held. It was easier just to design and print one of these. The 4 sides don't match the other knob but it works well. If that bothers you, print two matching knobs. Print face down, hole side up. No supports needed but use high infill (99%) for strength.