Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5277843.
This is a super quick, super low filament usage Test Print which you can/should use to dial in and adjust the corners for perfect leveling.
My recommended steps:
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measure the x-axis gantry on both sides (since it is dual-z steppers) to ensure it is perfectly level to the frame. Disable the steppers and adjust as necessary.
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manually level with a piece of paper on all 4 corners, then auto-level (if you have a CRTouch/BLTouch) and save to eeprom.
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use the attached .STL file (super quick, super low filament usage) to run a test print and adjust the corners as necessary during it.
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use the 'Tune | Babystep Z" as necessary when printing the skirt to ensure that you are getting good 'squish'