I am using TMC2100 clones, and they are working OK. Every now and then I get a skip on the X axis. When I try to adjust the VREF, the voltage climbs smoothly until about .8vdc. Then it jumps to 1.8vdc. I can't adjust the drivers to any point in between, on either of the TMC2100s.
Am I doing something wrong or should I just order the Watterott genuine articles?