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I have the community edition of the firmware for my CR-6 SE printer installed on a BigTreeTech SKR-CR6 V1.0 board. This firmware has a nice E-step calibration guide you can use to easily get the correct step/mm value.

However when I raise that value, my extruder motor starts to chop, it's like it doesn't have enough strength to push the filament through and starts chopping.

I tried raising the current on the extruder motor, from 600 mA which is standard, to 900 mA incrementally, but it didn't make any difference.

I just replaced the stock extruder with a dual gear extruder in hopes that the extruder was causing this. but the new extruder faces the same issue.

I think raising the Vref value for the extruder motor might help, but I don't know how to do that. on the BTT SKR-CR6 V1.0 board all stepper drivers are in UART mode so there is no way to change this on the board itself. and there is no way to change Vref in the UI as far as I know.

What should I do to progress with this issue?

0scar
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inifus
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1 Answers1

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You cannot change the Vref of a UART operated stepper driver, setting the current directly is the way to go on UART operated stepper drivers; in fact that is actually what you are doing on non-UART operated stepper drivers, you change the Vref to change the current through the stepper motor, the higher the voltage the higher the current through the stepper the more torque the stepper has.

Depending on the stepper you may increase the current even more, this depends on the stepper motor model/type. There are stepper motorss that allow more than 1000 mA, I don't know the steppers used in the CR6 E, find out before you test higher values.

Please note that there may be something else causing this issue, possibly your filament path is having a lot of resistance. You should check the extrusion manually and possibly clean the nozzle and heat break.

A similar question is found here: Is the Vref trimmer relevant on TMC2208 in UART mode?

0scar
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