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Extruder Stepper Slipping/Skipping/Losing steps

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Printing black amazonbasics PETG at 240C, 35mm/s print speed, 2mm retraction distance at 35mm/s. E-steps is at 96.2, feed rate is 25mm/s in firmware. This problem has occurred with amazon petg, 3d solutech PLA, and hatchbox PLA. I have tried several different springs and a spring tensioner, and differing levels of tightness on the screw that holds the lever to the plate, all with the same clicking sound. I have tried about three new nozzles and performed cold pulls.

Mods installed:

-LM8LUU three bearing setup for y carriage

-Removed all belt tensioners and tightened belts

-Screw-in Thermistor from Gulfcoast Robotics

-Self-Made silicon sock using mold on thingiverse

-5015 Radial Fan mod on stock duct

-Microswiss extruder plate and lever (with stock PTFE hot end)

-Ball bearing hot end cooling fan

-Glass Bed with thermal pads

-Spring cups

-TUSH spool holder with filament guide

-Z Brace

-Brand new stainless steel 36t extruder gear

Does anyone know how to fix this?

Yeah you need to go all metal hotend with PETG, short story is that PTFE lining sucks for heat transfer and the issue seems to be far more pronounced with the hotter plastics like PETG. Hold the extruder lever down when the hotend it up to temp and try and push the plastic through by hand, its really hard. Now that i have micro swiss all metal hotend its effortless to push the plastic through even at the lower temps like 215-220.