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Biqu H2 on Sidewinder X1 - extruder not working


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I just ordered and installed the Biqu H2 and SKR 1.4 turbo board on my Sidewinder X1 v1. I'm having an issue getting it to extrude, when I warm up the nozzle and try to extrude the motor just grinds/clicks and the gear doesn't move.  If I try and 'help' it with my thumb on the gear it will spin but not smoothly. If i disable the motor and spin the gear manually it spins smoothly.  I've disassembled the extruder, cleaned all the gears and lubricated.

Here's a video: https://imgur.com/a/e4fjGWF

I'm running the latest Marlin Bugfix 2.0.x firmware and have checked the current on the motor:

#define E0_CURRENT 900
#define E0_MICROSTEPS 16
#define E0_RSENSE 0.11
#define E0_CHAIN_POS -1
//#define E0_INTERPOLATE true
//#define E0_HOLD_MULTIPLIER 0.5

Any assistance would be greatly appreciated, thanks.




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