Well I’ve fought this all week and I’m stumped. I thought I blew my Mini’s Rambo board when I accidentally pulled the wires out of the Titan Aero’s thermister while cleaning off some nylon filament gooped onto the nozzle and wires while heated. I didn’t hear any pop or smell smoke or anything. I was able to remove the filament and change to another filament and extrude a bit to purge out the old filament, but when I shut done the printer and turned it back on and tried to connect to Octoprint it would connect, then shut down with a MinTemp Error:
Recv: FIRMWARE_NAME:Marlin FIRMWARE_VERSION:18.104.22.168 EXTRUDER_TYPE:SingleExtruder SOURCE_CODE_URL:https://code.alephobjects.com/diffusion/MARLIN PROTOCOL_VERSION:1.0 MACHINE_TYPE:LulzBot Mini EXTRUDER_COUNT:1 UUID:351487b6-ca9a-4c1a-8765-d668b1da6585
Recv: ok N1 P15 B3
Recv: ok P15 B3
Send: M155 S2
Recv: ok P15 B3
Recv: T:0.00 /0.00 B:0.07 /0.00 @:0 B@:0
Recv: Error:MINTEMP triggered, system stopped! Heater_ID: 0
Changing monitoring state from ‘Operational’ to 'Error: MINTEMP triggered, system stopped! Heater_ID: 0
Recv: Error:Printer halted. kill() called!
I got the same MinTemp Error when trying to connect via USB in Cura 2.63. I talked to Lulzbot support and they said the Rambo wasn’t blown but there was probably a break in the cables somewhere between the thermister and the board. I checked the thermister and heater cables as best I could and could not find any obvious problems in the cables. I also checked them with my multimeter and they have signal. I even ran some new wires to the heater and thermister just to be sure and still I get the MinTemp error. Am I missing something? Maybe the Rambo is damaged. It seems to function, but just keeps triggering the Min Temp error. I even reflashed the the firmware, reflashed it again with an older version, and reflashed it with the newest firmware, and still get the same error. The board responded while flashing and Cura reported successful firmware upgrades each time.
I’m out of ideas and think I should just spring for a new Rambo and hope for the best. If anybody has any ideas, I sure would appreciate the help.