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Thread: Shifted / Offset layers in print
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08-01-2016, 05:31 AM #1
Shifted / Offset layers in print
Hi everyone,
I am printing in flexPLA and at some points the 3D printer creates shifts in the layers, only in the X-direction.
See the pic attached for an example.
There can be many causes:
http://reprap.org/wiki/Shifted_layers
The belt tensions are exactly right and the motors work fine.
I suspect a backlash in one of the C-clamps causing at some point too much friction.
Or can it be something simple like the arms needing oil?
Has anyone else had the same problem?
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08-01-2016, 07:57 AM #2
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- Jul 2016
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- Pennsylvania, USA
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Hi
Yes, I have seen exactly the same issue.
Since I don't know what kind of printer you are using, it is tough to know if my slipping parts are the same as yours. Set screws on D shafts can do that.
Bob
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08-03-2016, 04:31 PM #3
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- Aug 2014
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- Montreal, Quebec
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Have you repeat the print and did it happen again?
Typical issue could be your nozzle slamming your print. Make sure nozzle is cleaned and doesnt have a huge junk of crap sticking on it.
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08-04-2016, 05:06 AM #4
It happens in about 1 out of 10 prints that I do.
I reassembled the print arms and checked the electronics - one of the heatsinks on the motor stepper drivers is missing so I am suspecting that this motor is skipping steps causing the offsets. I will put on some thermal paste and see if it resolves the issue.
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08-04-2016, 05:58 AM #5
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- Jul 2016
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Hi
If you have rate dependent thermal motor shutdown, the answer may be to drop the speed. If it's purely thermal, it should happen when the printer has been on for a while. In that case, you may have to much current headed into the motors. The little paste on heatsinks do very little for the drivers. You can get a little more benefit from a fan. Even there the benefit is less than you might think. The way the chips cool and the pc board layouts don't generally work very well together.
Bob
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08-04-2016, 03:07 PM #6
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- Aug 2014
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- Montreal, Quebec
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Dont just put the heatsink, put also a fan or make sure it is running free. Sleeves bearing clogged up easily and needs to be cleaned frequently.
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08-30-2016, 02:51 AM #7
Hi Bob, thank you - it happens when the printer has been on for a long while, and indeed the cooling paste doesn't help very much. So when I turn it off between prints to let it cool down it works as normal again. Thanks!
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08-30-2016, 04:44 PM #8
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- Jul 2016
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- Pennsylvania, USA
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Hi
Put a fan on it. Running the chips hot shortens their life.
Bob
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09-12-2016, 10:54 AM #9
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- Sep 2016
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Make sure nozzle is cleaned and doesnt have a huge junk of crap sticking on it. In that case, you may have to much current headed into the motors
Ender 3v2 poor printing quality
10-28-2024, 09:08 AM in Tips, Tricks and Tech Help