@Bill That's super nice of you! I am curious it was just a really tight batch of tubes? Or if I should switch it to wider ones since these don't need to be that tight above the splitter?

I'm having the same issue. When the gears do get a grip, they just end up pushing the tubes out of place. I've tried multiple brands of filament and the tubes are just too tight without enough grip and without enough hold to stay in place.