The problem looks similar to others posted where there seems to be something causing the controller to reset. However, I’ve replaced the power supply with a 24v 6 A supply, it’s on a UPS, and I think after watching video of it, and being able to find ways to reproduce it, I think I can confidently say it is not a supply power issue. This isn’t inside the enclosure, so it’s not the old door opening safety mechanism issue either.
The symptoms are this: print will be running fine, and anywhere from a few minutes to a few hours into the print the print head will stop moving, the blue flashing light on the controller will turn off (unclear if all of the fans also stop), the screen will stay in the sleep mode. A few seconds later there will be a click, the screen will flash the white boot screen momentarily, the blue light on the controller will start flashing again, and the screen will show the temperatures set to zero and the progress bar at zero. The power supply and UPS remain operating normally the whole time, and I believe it even happens if I leave fans off, so I don’t think it’s a power supply issue.
I’ve noticed it only seems to happen on models that are not just big, but that take up a lot of continuous space on the build plate, say around 1/3 of the surface area or more. I’ve done big multipart PIP articulated models that printed for 16 hours without issue. But put in a model that has a raft a couple inches square (like a 190% scaled up benchy at 114 mm x 58.9 mm x 91.2 mm) and I can get it to reset anywhere from a few minutes into the raft to a few hours into a print.
I have made some modifications to the original:
- Z-axis extension installed (doesn’t seem to be the issue)
- new Noctua fans installed on the controller and the print head
- New part cooler connected to the print head power with a pot to control fan speed manually.
At this point I’m wondering if it has to do with:
- Thermal control issue when trying to heat the bed with a large print on it (maybe it messes up the controller and it triggers a runaway protection?) - I haven’t been able to observe the temperatures because the screen will be in the ‘screensaver’ mode. I’d love to know if I could turn that off…
- thermal instability in the controller (something in the controller gets too hot and the controller reboots) or maybe another component
- Electrical issue in the controller (something not behaving and the controller rebooting to try to recover)
I’ve reached out asking if support has any ideas, but I figured I’d check here too. Anyone run into this? Or have ideas of what it might be?
I am a little worried about buying an even beefier power supply and seeing if that helps since this one is already like 50% higher power than what the machine came with, and I’m fairly certain the loads I added wouldn’t add that kind of draw), so I don’t expect it would make a difference.