I have an MK4+MMU that I bought partially with the intent of building PLA-supported PETG and TPU parts. I haven’t dug in too far yet but in the few prints I’ve done the PLA has severely degraded interlayer adhesion. Presumably this can be addressed by purging (much) more on changes from PLA, but if I had known this before I bought, I would have seriously considered a multi-head printer.

I suspect an electrical issue on the motherboard.

• What happens if you swap the bed and hotend thermistor, and/or plug one of your reference thermistor into the bed input?
• What is the open-circuit voltage on the signal line of the hotend and bed thermistor inputs?
• What is the short-circuit current of the same?

If you see differences in those last two points, that is a clue that something is messing with the divider circuit that the thermistor is a part of.

That adds up. All the spots it broke are where the filament bends pretty substantially. Thanks.

23% is really just the bottom range of what your dryer will report. My dryer is 15%. Who knows what it really is below that, and whether those numbers are even accurate?

But after a day of drying at 50C you PLA will be bone dry regardless of what the dryer reports.

I imagine something like colonal cavitation. Little sonic booms of intestine collapsing on itself. Probably not healthy

The nice thing about this style of communication is that it makes the context explicit, so I can at least look up what you’re talking about. You know, when I have access to a means to search the entirety of a civilization’s works.

I think you are looking for a caliper

But it might be more fun.

Or more tedious 😀

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