Someone mentioned some errors with delta calculations with 20 tooth pulleys on marling firmware. I have the 20 tooth pulleys on my printer, so far no issues. Keep in mind two things however, 1 plastic just like any material expands and contracts with heat, and 2 it could depend on the slicing software. I had ok luck with kisslicer, better luck with cura. Almost no luck with slicer itself. The joys of tuning a printer.
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