Last night, I tried printing a bigger 20cmx20cm square. It seems to be un-square in the same way. Both sides measure right on at 20cm, but when compared to a carpenter’s square, it’s about 1.5mm off over the 20cm length. I’m using your mount, but haven’t tried using the perpendicularity tool.
I’ll probably take the middle apart over the weekend. Other than the 4 – 3″ bolts and the bolts holding the joiner pieces together, what else should I check?
I am still somewhat suspicious of the roller parts. While I was cleaning them up, I noticed the circular area the conduit sits in looked slightly crooked and I’m wondering if the PETG sagged a bit on the “overhang” areas. I’m thinking of sanding those parts more to try and even it out.