More here: https://www.printerknowledge.com/threads/crest-to-colgate-toothpaste-transfer-adapter.13105/

Remixed from:
https://www.thingiverse.com/thing:158910
and
https://www.thingiverse.com/thing:2238071

I like the travel size Crest, but like / have Colgate toothpaste. I printed these two and tested them individually, then mixed them in Tinkercad.

I only tested it on these two types of tubes