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Yes, we found two problems.. a bad crimp on the fuse and the red insulation on the crimp had slipped so the fuse lead was grounding out against the heat sink on the hot end. Once we corrected those problems, it ran fine.

Yep - check for shorts from the fuse lead to the hot end heatsink too. while troubleshooting, I'd opened a support ticket and they said it may be a bad fuse.. So we partially disassembled the hot end and removed the fuse. We checked it and it was good. While pulling it out, it came out of the crimp ...

Thanks everyone for the help

It turned out to be a faulty connection from the thermal fuse to the heater cartridge. It's connected by sliding the two leads through a ferrule and then crimping. Apparently we hadn't gotten it crimped well enough.

Logically, if you have a multimeter, check the voltage drop across the thermal fuse. if it's more than a volt, it's probably the thermal fuse. I would ensure the connector is properly and completely seated (I realize that if the LED's illuminate, that should be fine, but humor me by doing that firs...

This may not help, but my son and I had a similar problem on our first calibration. We found that the carriages weren't hitting the limit switches at the top, I guess this was causing it not to 'know' how far to travel down. We figured it out by turning off the printer and manually moving each carri...

The printer hot end will not heat. About 30 seconds after turning on the extruder heat, the display changes to 'def' for both readings and the display reads 'Heater decoupled'. Red LED's light up on both the hot end and the Rambo when heat is enabled. After powercycling, the temperature readings on ...

MatterControl is shrinking the prints we send to our Max v3. For example a bezel I made in Freecad measures 74mm wide, but printed just about 30.5 mm. The multiplier (~2.54) sounds suspiciously like a mm to inch conversion. Curious thing, the dimensions displayed in MatterControl are correct, so I c...