Sunday, May 6, 2012

Z axis problems

Bad news - I upgraded the Z axis hoping to get rid of some periodic distortion, but my calibration prints look worse than before ;-(

After printing out a 20mm calibration cube that was only 16mm high, I realized that I'm loosing Z steps -- the  Pololu motor drivers have an adjustable current setting, and I'm guessing that while things worked before, it must have been right on the border. Moving the additional mass of the bigger ACME screws caused the drivers to overheat and miss steps.

Adding a fan blowing over the RAMPS board seems to work for now.

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