Is there a reason, why the Y-axis is set to 8 Microsteps and 180 steps per unit? During printig the chimney of the 3DBenchy I relized some vibrations and I thougt they come from the Y-Stepper. I changed the Y-axis driver to 16 microsteps and the firmware to 360 steps per unit and it prints much smother now! Is there any disadvantage with this setup? Franz
Your Y-axis speed will be limited due to how fast (not very) step signals can be generated on an 8-bit Marlin platform. Ot go faster you'll need to reduce micro stepping or move to a 32 bit platform.
Ok, so I halved the max possible Y-Feedrate. :-( The RepRap Wiki defines following max step-rate Marlin/Repetier ATmega 16 MHz, Single Step-Mode: <10.000 Schritte/Sekunde (10 kHz). which woul lead to a max Y-feedrate of: 10000/180 = 56 mm/s for the original setup (180 steps/ mm) and to 28mm/s for my setup (360 steps/mm) In the firmware I found: #define DEFAULT_MAX_FEEDRATE {150, 150, 6, 50} // (mm/sec) This 150 mm/s is 5 times my 28mm/s but still about 3 times 56mm/s. Where is the error in my calculations or the assumptions? Nevertheless I will go back to 1/16 Microstepping.
Marlin use quad-step, so the limit is 40 000 step/s. With 1/16 microstep on y-axis the limit will be 111 mm/s.