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Hi, first printer, i am trying to change the setting for my extruder thermistor. i have accessed the present firmware thru Marlin and Arduina, changed the setting. My problem comes in trying to upload to the printer, i corrected a couple of errors but now it comes back with cannot connect thru com. i generally use com 3 when i am printing, it asks for two com numbers i have tried several different combos but to no avail, what am i doing wrong ? Any help you can offer would be appreciated.

Thanks

Terry