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Need help troubleshooting your BoXZY 3D Print Head? You're in the right place!

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Pinout for the 3d Printer unit.

So I’ve been having intermittent machine failures (firmware unresponsive over COM port) which freezes all the motors mid-print, but leaves the heating elements on. I pulled the 3d print head apart to unblock the nozzle after a particularly long time sitting idle, burning the same piece of filament and now that I’ve reassembled it, the arduino reports the temp as -26 degrees and that the milling head is attached. My understanding is that the detection is based on the resistance from the thermistor and either I’ve broken a wire there, or something has short circuited and I’ve cooked the pin on the arduino itself.

Does anyone know the pinout (now that the unofficial forum is down) for the 3d printer head so I can test the resistance of the thermistor with a multimeter before I start pulling apart more of the machine again?

Please upload an image or a list of pins (and let me know which you’ve taken as pin 1) so that I can troubleshoot.

Thanks.

Maz

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The Temperature pin is Pin 8 on the Arduino. If there is damaged to PIN 8 you can adjust the firmware to use Pin 10 and move the actual plug up one on the main board. The thermistor plugs are middle right side on the main board. You need only switch the green/blue with red/white (bottom to middle).

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Thanks. I'll pull the board out and test the pin directly with a thermistor. Am I correct in assuming that this is the sole way that boxzy detects which head is mounted?

I'll report back what I find out.

by

Yeah, it is the only detection method.

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I just disassembled the print-head again, found that the 2 wires off by themselves are the thermistor connection. Having discovered this i checked them with a multimeter and found that its reading between 95k and 108k ohms, depending on how much i’ve been handling the block. So it doesn’t seem to be a thermistor wiring issue, at least not out at the module end of things.

Am i correct in assuming that this temp sensor is why the print head isn’t being detected?

Thanks, Maz

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Can anyone tell me what pins on the mega2560 the thermistor is read off? I can pull out the board and use another 100k thermistor to test if the board is still okay.

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So I disassembled the whole machine again to test it. When the arduino isn’t connected to the ultimaker board, it detects a 3d printer and a random temp of between 100 and 200 degrees. The reason mine wasn’t detecting the print head was because the new arduino mega was faulty and wasn’t reading across pin 8 correctly. I replaced it with another mega to solve the problem.

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One problem I had with the thermistor was a cabling issue.

I ordered a replacement cable harness from Boxzy, and used the previous cable assemble wire colours as a guide.

Unfortunately the colours were not a match to the cable assembly that came with my original Boxzy printer head and I kept getting the thermistor is at -375 degrees error.

I nearly replaced the ATMEGA until I realized that the pinouts from the cables were different (red wire on the new cable assembly went to a different pin than red on the original assembly).

Verify pinouts on the wire assembly.

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Maz will be eternally grateful.
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