After a few tries, we finally got it! A lil screw converter for toothpaste tubes. Don't print with supports.
Update 3.16.23: I was informed by u/MillennialGeezer on reddit here that this design only works with Crest, that it needs to be upscaled 110% for Colgate, and it won't work between brands. Thanks u/MillennialGeezer!
The author marked this model as their own original creation.