I’ve been playing around with heating the chamber on a spare X1C for a while and here’s what I’ve found:
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I’ve been running an X1C at 60°C for a few hundred hours now without issue.
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I would not recommend higher without swapping to high temp steppers as they’re running at ~87°C at 60°C chamber temp. Assuming they’re class A then the insulation is good to 105°C but that’s the windings, the 87°C I measured on the case is probably already pushing it.
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When the chamber temp exceeds 70°C, the heated bed is automatically shut off. I have only tested for this behaviour when NOT printing, just while at idle. I cannot say what will happen if the chamber temp exceeds 70°C while printing.
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If your room temp is above 10°C then getting the chamber to 60°C can easily be achieved by just insulating the printer and setting the print bed at 100°C+ (which is generally what you’ll be doing anyway if you’re printing a filament that benefits from a heated chamber). Even wrapping it in a blanket/bubble wrap works fine. Cover the top, sides, front, and top 1/4 of the rear for best performance (If you still want to be able to see in the front then grab a replacement glass door and bodge a double glazed window but you still need to seal the gaps around the door (edit: and you need to change the hinge for clearance)). Although frankly even covering just the top and sides makes a huge difference.
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Speed up the preheat by raising the heated bed and turning on the Aux fan.
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To actively heat the chamber you can just place any old heat bed you have lying around in the bottom of the chamber (on feet to keep it away from the plastic base). Works just well enough with minor insulation. This doesn’t circulate air but depending on the filament and print size that can be beneficial. Take care not to crash the bed into it - it’s not a perfect solution.
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If at any point you start getting layer shifts, it’s because the stepper motor drivers on the motherboard are going into thermal protection and losing steps. This happened to me when I was pushing anything above 60°C. To solve it I simply stuck a 40mm fan on the outside of the case blowing into the vent holes over the motherboard. The motherboard already has a fan but it draws air from within the chamber. Ideally the electronics need to be sealed off from the chamber, I’ll get to it eventually but for now the bodge fan is working fine.