britton

Sure, it was actually pretty straightforward once I found the lines to change. First off, I downloaded the ultimaker + heated bed arduino source from here: https://github.com/Ultimaker/Marlin/tree/Marlin_UM_HeatedBedUpgrade Then I opened up pins.h and changed lines 1297-1304 to this #define HEATER_BED_PIN 4 #define TEMP_BED_PIN 9 #define HEATER_0_PIN 2 #define TEMP_0_PIN 8 #define HEATER_1_PIN -1 #define TEMP_1_PIN -1 ....basically, disabling HEATER_1 and TEMP_1, and changing TEMP_BED_PIN from pin 10 to pin 9. HEATER and TEMP_0 should be left alone, as they're for your hot-end. Then I saved out my new pins.h, opened up Marlin.ino in the Arduino IDE, and uploaded it to the Ultimaker's mega. For me it was that easy, and it's been working ever since. Hopefully it works for you too...

Hey, just FYI, I managed to get mine working... ...after checking your link, I tested the voltage across the temp signal lines going into the mainboard, and noticed the bed signal was putting out 5v when unplugged, which is WAY too much. So I plugged the HB daughterboard into temp2, and recompiled Marlin so that the bed would read the temp going into that pin instead.... seems to be working so far! At the very least, the error is gone, and the bed heats up. Long story short, I think my arduino might be faulty... Hope you have luck with yours.

Okay, thanks for the quick reply!!

Hey Dave, Did you ever get this solved? I'm having the same problem on my 1.5.7 electronics. The heated bed reads at about 106 ohms (it's chilly in montreal), and I've triple checked all other connections, but nothing seems to get rid of the MAXTEMP BED error on bootup. I tried rolling back the firmware so I could at least run the printer normally again, however the new z-screw has a different thread gauge, so I'll need the HB firmware update in order to run. Any ideas? thanks!