Bulging corners April 08, 2016 12:14PM |
Registered: 8 years ago Posts: 35 |
Re: Bulging corners April 08, 2016 01:11PM |
Registered: 10 years ago Posts: 154 |
Re: Bulging corners April 08, 2016 02:08PM |
Registered: 9 years ago Posts: 1,873 |
Re: Bulging corners April 08, 2016 03:11PM |
Registered: 8 years ago Posts: 35 |
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JamesK
Bulging corners on a test cube are typically caused by over-extrusion as the printhead slows down for the 90 degree angle change.
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JamesK
The corner that is the worst is typically the corner where the seam is for changing layers, because that's the corner where the head dwells for the longest.
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JamesK
You can usually improve this by decreasing the print-speed and increasing the XY jerk, but obviously going too high will introduce it's own problems - more ringing and increased stresses on your printer. When designing your own parts it's best to use fillets on corners in the XY plane so that the head speed can be maintained.
Re: Bulging corners April 08, 2016 07:07PM |
Registered: 9 years ago Posts: 1,873 |
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What confuses me more here is when I turned the cube 45 degree and added 20% infill, the layer changes happend on two different corner that don't bulge as much. confused smiley I have triple checked this since I thought I was looking at the wrong corners. Seriously whats going on here.....
Re: Bulging corners April 09, 2016 05:56AM |
Registered: 8 years ago Posts: 35 |
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JamesK
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What confuses me more here is when I turned the cube 45 degree and added 20% infill, the layer changes happend on two different corner that don't bulge as much. confused smiley I have triple checked this since I thought I was looking at the wrong corners. Seriously whats going on here.....
I'll join you in confusion. The slicers remain a complete mystery to me. Sometimes they seem to change where the seam is for no obvious reason, and don't get me started on some of the weird stuff that Slic3r does for bridging. What's going on with the infill in that print? It seems to be mostly hex with some bits of line - or was that just some ooze that stretched out?
Re: Bulging corners April 09, 2016 08:27AM |
Registered: 9 years ago Posts: 1,873 |
Re: Bulging corners April 09, 2016 12:07PM |
Registered: 8 years ago Posts: 35 |
Re: Bulging corners April 09, 2016 01:19PM |
Registered: 9 years ago Posts: 1,873 |
Re: Bulging corners April 09, 2016 01:48PM |
Registered: 11 years ago Posts: 5,780 |
Re: Bulging corners April 09, 2016 02:14PM |
Registered: 8 years ago Posts: 35 |
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the_digital_dentist
That part is small and the time it takes to print a layer is short. That doesn't allow time for the previous layer to cool/harden before the nozzle comes by and heats everything up again. You're printing on mushy layers and they're getting squished out by the fresh, hot plastic from the nozzle.
Try printing two or three of those at once separated by a few inches on the bed and you'll see a drastic improvement in quality.
Re: Bulging corners April 09, 2016 02:16PM |
Registered: 8 years ago Posts: 35 |
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JamesK
I wouldn't have thought it was the hot end - why would it only affect the one corner, with the rest of your perimeter looking very good. Seems odd. If you wiggle the hot end is anything loose? Just wondering if the extra movement in that corner would cause a physical displacement if the hot end wasn't tight in the carriage perhaps? Grasping at straws I know...
Re: Bulging corners April 09, 2016 02:49PM |
Registered: 9 years ago Posts: 1,873 |
Re: Bulging corners April 10, 2016 05:27PM |
Registered: 8 years ago Posts: 35 |
Re: Bulging corners April 11, 2016 10:09AM |
Registered: 8 years ago Posts: 35 |
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CTCHunter1
Is it backlash or some hysteresis? Do you have belt tensioners in your x and y axis? Are your belts reasonably tight?
I would try lower speed and lower x and y axis acceleration and see if it makes it go away. You can change those things temporarily by adding M203 and M204 commands to your starup G-Code section of Slic3r. Mine are set to 200 and 1000 right now.
M203 X200 ; max feed rate
M202 X1000 ; max acceleration
Re: Bulging corners April 11, 2016 10:41AM |
Registered: 8 years ago Posts: 183 |
Re: Bulging corners April 11, 2016 10:46AM |
Registered: 8 years ago Posts: 35 |
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Montiey
If its just in one corner, then probably leaking when changing layers. Maybe disable any retracts-upon-z-change?
Not letting the nozzle idle is key- you want a constant flow of plastic to make sure that no areas get too much, and as a result, that no areas get too little.
Re: Bulging corners April 11, 2016 11:11AM |
Registered: 8 years ago Posts: 183 |
Re: Bulging corners April 11, 2016 11:17AM |
Registered: 8 years ago Posts: 35 |
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Montiey
Set your infill to 0 to see if it is actually the infill. If not, the. it's a mechanical problem because it should be happening in the others corners.
Re: Bulging corners April 12, 2016 07:32AM |
Registered: 8 years ago Posts: 413 |
Re: Bulging corners April 12, 2016 11:45AM |
Registered: 8 years ago Posts: 35 |
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MCcarman
You sure you are not just chasing the shrinkage. The walls typically shrink more than the corners so the walls "pull in". This is why the infill affects the outside as it can reduce the shrinkage.
The corners will be thicker with increasing nozzle size so a 0.5 nozzle will be more of a problem than a 0.4mm.
The order of printing the perimeter should have an influence. As the 1st perimeter printed can cool/shrink before the next perimeter is extruded.
Don't forget your fan will affect the cooling rate and hence the distortion. Sounds like your bulging corner is the one nearest the fan.
Re: Bulging corners July 05, 2017 11:50AM |
Registered: 7 years ago Posts: 34 |
Re: Bulging corners July 05, 2017 01:08PM |
Registered: 8 years ago Posts: 35 |
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saintofinternet
sorry to wake this topic after one year...
did you get the improvement? i am building a printer and facing the same problem??
inputs will be highly appreciated.