Tape dispenser core.  Someone threw one out at work.  I looked at some I found online and they were not going to fit because the axle was too big.  I quickly designed this one and printed it.  It works great.  It fits the C-38 dispenser from Scotch .  

I did find that printing on one flat with supports works best.  Without supports the axle prints really rough.  I also tried printing one on end with supports.  The supports were super hard to take off and the dimensions of the triangle was just enough smaller that the roll of tape didn't grab onto the core.  

Recommendation: Print on one face as in the layout.

Please use the CAD model included