Hi anxjfarnoth, what type of filaments are you using? You are talking about the tiny gap between the driving wheel and the place where the bowden sits? I thought that might be an issue only with flexible filaments.
I used "tried" to print with PLA(proper UM filament), Ninjaflex, alloy 910 and nothing seemed to work, and yes that's what I'm talking about. the hole has already showed elongation and you can see a clear lip on the back side of it.