Summary

Great blocks in this design: https://www.thingiverse.com/thing:6368467

Everything prints and assembles perfectly. But to my regret, I was not able to turn the central part of the roller - the gap in it turned out to be small.

Since all printers are configured differently, I made several different rollers with different gaps in the central part. Everyone can choose the one that will print normally on their printer.
You should choose one with as little clearance as possible: otherwise the roller will have a lot of play.