Tool stops being active half way the print
I'm experiencing an odd behaviour with my Duet WiFi 1.02 Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 2.05.1 (2020-02-09b1).
I have dual extruders but I print with only one of them most of the times. I slice with Simplify3D.
Sometimes the tool is "deactivated" mid print so the printer keeps working with no tool selected. I get errors in the console but as you can expect, no plastic is extruded and the entire thing fails.
I know is not the slicer because I re tried the same file and it completes. It happens randomly and not often, but when it happens, it might ruin a 20hs print.
I experienced it for the first time when I upgraded to RepRapFirmware 3. It was happening quite often so I downgraded back to stable version 2. Now it happens still though more sporadically. Ideally, it would not happen at all. I wonder if anybody experienced/resolved a similar problem before.
Is the tool really being deselected, or is the firmware reporting a heater fault and turning the heater off?
I think you're right, I remember reading something related to a heater fault in the console. I will pay more attention the next time the issue appears. Why do you think that it could happen?
Why do you think that it could happen?
Sometimes the part cooling fan will be running a lot during a bridging operation, or when doing a large section of solid infill and the change in flow will cause more air to blow onto the block causing it to cool rapidly.
It's recommended to use a silicone block sock and to PID tune the heater while the part cooling fan in on so that it's effects are part of the model.
@Phaedrux that's a quite likely cause. I didn't have a part fan for a good while and I added one more or less at the same time this started to happen. I had a silicon sock on, but I took a quick look and it has a big hole in the side, next to where the parts fan blows.
Actually, I have to upgrade the part fan to a more powerful one I bought. I will upgrade it and have it blowing at full speed, if that's the cause then the problem will show up more often. Thank you!