I’ve recently purchased (from here) the parts for an MPCNC. While mounting in the rollers, I noticed that one of them had a little crack (see pictures). I thought that’s not a big deal and moved forward. A few days later I took a look at the rollers again and saw that all of them have a crack in the same place.
The parts I’ve bought are for 25mm pipes and I use 25x3 mm pipes.
Do you guys know if they are still usable, should I replace them or should I just throw in some glue? Also, what might have caused this? I did not tighten the bolts a lot…but perhaps I overdid it?