10oz Caulk Tube Cap
thingiverse
I've seen several of these around here that didn't quite fit or grip well at all. After some experimentation though, this one seems to be working out for me. It fits snugly and holds up perfectly on the 10oz caulk tubes I've tried so far. You'll need to rotate it before printing since Fusion 360 leaves things lying flat. Nothing too complicated about printing it itself, but if you're struggling with bed adhesion you might want to consider adding rafts or something. On my printer, with a PEI surface, it printed just fine without them.
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