Geeetech

So far, 0.6V is working fine for me.

Hi. I had to set stepper voltage to 0.7. It was originally set to 5.5, and steppers did not have enougt torque and missed some steps. At 0.7, it is ok, no more steps missed and steppers don't even get warm A4988 can drive up to 2A motor. I would suggest to set the pot for 0.6V if the motor can run ...

I posted earlier saying my Rostock 301 dropped about 3/4 inches when cutting power on my power supply. I was experiencing the free fall condition when turning off my power supply after I ran the program to exercise all axes motion using program from SD card. At the end of the program it brought all ...

Isn't this caused by the weight(hot end assembly) and gravity when the power is dropped off to the motors? Mine drops about 3/4 of an inch when either hitting E-Stop on Repetier-Host or turn off the power supply. Anyway to put a brake on the top pulley for each axis? The brake is released when the m...

Thanks William.
Do you have a list of G-code and M-code descriptions for Rostock 301?
Thanks again for your support.

Thanks.
VREF = 1.5 /2.5 = 0.6V
Same formula from "https://www.pololu.com/product/1182"

Thanks William for the stepper motor specification.
Can you share what and how to determine the VREF voltage(current limit) on A4988 module for Rostock 301?
Thanks again.

Hi all,
Just finished putting Rostock 301 together. I like to exercise X/Y/Z motion up in the air without running heat bed or extruder motors. Does anyone have any motion exercise program can share? I like to be able to run circle diamond square, might be closed to each axis travel limits. Thanks.

Thanks William for your quick reply. X/Y/Z motors are 42SHD0217-24B The current rating are 1.5A as I found from internet(file attached). Based on "https://www.pololu.com/product/1182", the calculation for adjusting current limit on A4988, Current Limit = VREF × 2.5. So, I used this formula and adjus...

Hi all,
Almost finish putting the Rostock 301 together. I think the axis miss steps at certain area of the machine. Can anyone provide the current limit for X/Y/Z motors and extruder motors? Thanks.