Replacement gasket for 3-part syringes by (West System 807).
Epoxy and paint sticks to rubber gaskets that come with reusable syringes, rendering them… well, not reusable at all.
Has to be printed out of TPU or some other flexible material.
Scale up in your slicer by about 1% (or whatever's recommended for the material you're gonna be working with).
The author marked this model as their own original creation.