lewisd wrote:The mylar sheet you mention, was that attached to the underside of the bed itself, between the rails?
Correct.
Mosselake wrote:Is the bed heater set to PID in the MP's firmware?
Good call - tuning the PID would definitely help if it's not set correctly. Try sending
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M303 E-1 S60 C8
and then wait for it to finish the tuning process. This will take some time.
It should report back three numbers, set those as your new PID values with "M304 P# I# D#" where "#" is replaced with the three new values.
Example:
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M304 P1 I2 D3
Then send
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M500
to save the settings to EEPROM.