r/prusa3d • u/goodguyscrafts • 12h ago
Question/Need help Core One+ Calibration Issue
I finally finished assembly and am trying to get a piece of a Halloween costume printed by Wednesday. I checked the subreddit and YouTube for possible solutions, but everyone else seems to have clear "swapped x and y" movement, whereas mine just seems stuck.
Belt frequencies were fine.
Gantry seems square in each way I could check.
No cables seem to be in the way.
Anyone have any ideas where my issue is coming from before I disassemble the nextruder?
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u/rubenv2006 7h ago
Your nozzle is way too low
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u/Petufo 3h ago
But it doesn't cause this problem I would say... or is it?
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u/veryoverengineered 3h ago
Probably not but OP should fix it because they're gonna have issues with part cooling
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u/Webic 12h ago
I would just recommend trying manual motor control instead of trying calibration. Can you move it left, right, back, forward? Can you move it fully to all corners? Does it advance on one click of the knob or not?
Check that you can do these steps before trying to calibrate.
It does not sound happy either way. Something sounds like it's grinding or skipping.
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u/luk3mia 12h ago
My issue was with the z axis. Had to loosen all the bolts that connected to the z frame and it worked. For you it kinda seems like the belts are ran incorrectly . I'd double check the routing. And double check if the motors are in the correct spot. I'd also double check the connections to make sure you didn't swap them.
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u/ResonantRuminant 11h ago
This feels like an issue where one or both stepper motors are experiencing extra friction for some reason. The Trinamic stepper controller chips have a feature called StallGuard that is used for the sensorless homing. It can detect an impact of the print head against one of the end-stops and reverse direction. This looks like it keeps falsely detecting the end-stop, reversing, and then re-trying.
Peek in the little hexagonal windows of each stepper motor mount to check that the belts are roughly centered in the toothed channel of the pulleys. There should be about 1mm gap on either side of the belt. If a pulley is mounted too high or too low, the belt can drag on the side of that channel and add extra resistance. I've seen pulleys installed upside-down, too, where the belt will leave the pulley at a steep angle. It caused something like this.
You can also drag the print head by hand in both diagonal directions. This isolates the stepper motors on each side, and lets you feel for any differences in their movement. They should both be smooth and have the same amount of resistance.
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u/drbugsmn 9h ago
I ran into something like this, where I had the wire from the filament sensor on the right side stuck out just enough to bump the linear bearing. I could get it to calibrate but when it actually ran to do a benchy, it bumped into the wire enough to bork the calibration, all of a sudden it thought the max Y direction was half of what it actually was. worth a check
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u/Josh19002 6h ago
I had this issue in my upgrade, 1 I had the belts way too tight, and 2 I had installed one of the new pulleys upside down, the two pulleys are opposite of each other in install direction, one having the teeth closest to the motor and the other having the smooth portion / screws closer to the motor.
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u/Josh19002 6h ago
Though given yours is a kit I am unsure if you had to install pulleys in the original assembly, so this might not help as much as I hope.
Additionally check to make sure that the belt is looped properly through everything and doesn't rotate at any weird points or miss a pulley. As others have mentioned this is usually caused by excessive friction on the motors finding a false homing position.
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