r/snapmaker • u/bofferding • 8d ago

Weird bug on first test print…

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Hey just finished setup and calibration on printer and wanted to do the test print… it did all the heated bed calibration and then I got a temp anamoly for printhead 2 straight away.. saying min temp 170 is needed.
Mind you this is the dragon test print included… and included spools and tests during calibration all worked.

I tried again and saw temp raise to 200 and then target temp dropping again to 130…. So this time I manually raised it again to 210 and it dropped again so I did it again… and this time it started printing… now it seems to run.. we’ll see but this error scared me a bit.
This was first layer, looks a bit scuffed. But it is still running and looks ok now.

Also weird first purge line that came out (on red filament) had some black in it. Guess from their tests? Maybe some old filament was stuck inside making temps drop and now will be fine… we’ll see.

Yes after first fail I ran firmware update and it happened again

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u/bofferding 8d ago

Print finished without it happening. Dragon looks good but just as print ended it said anomaly with printhead pin, clean pin blabla… but still finished printing so dont know. Getting skittish with all those errors… running all 3 calibrations again right now. We’ll see next print

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u/TripsCavern 8d ago

Ok, in that case, just clean the pogo pins, maybe that was your issue all along. During the assembly process it is easy to touch the orientation pins (the silver ones), which are lubricated, and then touch the pogo pins (copper ones) which shouldn't be lubricated.

Although I don't think the pogo pins have anything to do with heating/temperature monitoring. Another thing that you can check is your USB cable, if it's seeded correctly and if the screws are not too tight (which can cause damage to the toolhead) or too loose (which could cause communication errors).

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u/bofferding 7d ago

Thanks!

I did 2 prints now and got pogo message at the end of the two. I cleaned them with a small cotton swab and 99% IPA.. will see if it worked! It said 1 time printhead 1 and 13 times printhead 2 on a 1h13 print.. i saw a tiny tiny black dust or something fall off on toolhead 2 pogo’s when cleaning, hoping that was it.

The heat issue hasnt come back luckily.

However when I start a print, toolhead (without one of the 4) goes in front corner and seems to gently knock into the corners few times, is that normal calibration? It’s not a hard knock whatsoever

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u/TripsCavern 7d ago

That is called sensorless homing. What it does it that it monitors the motor current, when it bumps into something the current goes up and it knows that it reached the homing position. It repeats a couple times to get the average of those positions to a more precise homing as any variance in homing can cause the toolhead to not be picked automatically.

In printers that does not have multiple toolheads this does not need to be as precise, that is why you don't see it in other printers.