Problem with Layers
Posted by dasneo72
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Problem with Layers September 16, 2018 07:07AM |
Registered: 6 years ago Posts: 22 |
Hi everybody!
This is my first post on this forum and I hope to get help, because I‘m running mad on this.
My Mendel has a problem during printing. Somehow and not reproduceable on a specific layer, the print begins to „detach“ from the layer before. Don‘t know how to describe it better.
Any ideas?
Thx in advance
Francisco
This is my first post on this forum and I hope to get help, because I‘m running mad on this.
My Mendel has a problem during printing. Somehow and not reproduceable on a specific layer, the print begins to „detach“ from the layer before. Don‘t know how to describe it better.
Any ideas?
Thx in advance
Francisco
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Re: Problem with Layers September 16, 2018 07:21AM |
Admin Registered: 13 years ago Posts: 6,998 |
What is your layer height? is it constant (advanced slicers let you set different layer heights for different regions)
what is you nozzle size?
are you obeying the rule layer heights should not exceed 80% of nozzle diameter ?
I note its on a much smaller area, perhaps insufficient time between layers for the previous layer to solidify? (play with dwell settings)
Do you have a part cooling fan?
what is you nozzle size?
are you obeying the rule layer heights should not exceed 80% of nozzle diameter ?
I note its on a much smaller area, perhaps insufficient time between layers for the previous layer to solidify? (play with dwell settings)
Do you have a part cooling fan?
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Re: Problem with Layers September 16, 2018 09:42AM |
Registered: 6 years ago Posts: 22 |
What is your layer height? is it constant (advanced slicers let you set different layer heights for different regions)
what is you nozzle size?
are you obeying the rule layer heights should not exceed 80% of nozzle diameter ?
I note its on a much smaller area, perhaps insufficient time between layers for the previous layer to solidify? (play with dwell settings)
Do you have a part cooling fan?[/quote]
Noozle ist 0.4mm
I am using Simplify3D, did not know where to find the layer height, only first layer and this is set to 0.2mm
Cooling: nope, my duct is broken..but it works before without cooling that much,
Thank you!
what is you nozzle size?
are you obeying the rule layer heights should not exceed 80% of nozzle diameter ?
I note its on a much smaller area, perhaps insufficient time between layers for the previous layer to solidify? (play with dwell settings)
Do you have a part cooling fan?[/quote]
Noozle ist 0.4mm
I am using Simplify3D, did not know where to find the layer height, only first layer and this is set to 0.2mm
Cooling: nope, my duct is broken..but it works before without cooling that much,
Thank you!
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Re: Problem with Layers September 16, 2018 10:44AM |
Admin Registered: 17 years ago Posts: 7,879 |
Have you got a picture of what the part is supposed to look like. It looks like the top is shifted in both X and Y?
Are you sure the filament isn't dragging on the print head? Do you have it feeding through the PTFE tube. If not it can lift the print head and cause layers to not attach properly and also cause X shifts. Can't explain a Y shift as well though.
[www.hydraraptor.blogspot.com]
Are you sure the filament isn't dragging on the print head? Do you have it feeding through the PTFE tube. If not it can lift the print head and cause layers to not attach properly and also cause X shifts. Can't explain a Y shift as well though.
[www.hydraraptor.blogspot.com]
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Re: Problem with Layers September 16, 2018 01:44PM |
Registered: 6 years ago Posts: 22 |
Attached you will find the part I want to print.
I do not use a tube and the problem started when the nozzle begun to change Z height in relation to the bed. Then I tried to find out why Z sometimes has a Z0 the nozzle on the bed, and sometimes 0,3mm and more above the bed. I tried several configurations and finally I changed the screw nuts. Z0 seems to be okay now…...
Now I have this problem and I do not have an idea…..
thank you!
I do not use a tube and the problem started when the nozzle begun to change Z height in relation to the bed. Then I tried to find out why Z sometimes has a Z0 the nozzle on the bed, and sometimes 0,3mm and more above the bed. I tried several configurations and finally I changed the screw nuts. Z0 seems to be okay now…...
Now I have this problem and I do not have an idea…..
thank you!
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Re: Problem with Layers September 16, 2018 02:22PM |
Registered: 6 years ago Posts: 22 |
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Re: Problem with Layers September 16, 2018 04:15PM |
Registered: 6 years ago Posts: 22 |
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Re: Problem with Layers September 16, 2018 11:47PM |
Admin Registered: 13 years ago Posts: 6,998 |
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Re: Problem with Layers September 17, 2018 02:46AM |
Registered: 6 years ago Posts: 22 |
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Re: Problem with Layers September 17, 2018 02:47AM |
Registered: 6 years ago Posts: 22 |
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Re: Problem with Layers September 19, 2018 04:25AM |
Registered: 6 years ago Posts: 22 |
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Re: Problem with Layers September 23, 2018 03:11PM |
Registered: 6 years ago Posts: 22 |
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Re: Problem with Layers September 24, 2018 06:13AM |
Admin Registered: 17 years ago Posts: 7,879 |
It's hard to say without watching it go wrong or a better description. It seems to get offset in both X and Y simultaneously and also seems to get smaller and taper back out to the correct size. I can't think of anything that would do that but perhaps I am interpreting the pictures incorrectly.
Is the carriage firmly attached to the rails? Sometimes the carriage can break at the back where the third bearing is. In that case, if you don't have the PTFE tube the filament will drag and tilt the carriage updwards. That would cause the nozzle to swing back and up and cause layer to be shifted and not attached.
[www.hydraraptor.blogspot.com]
Is the carriage firmly attached to the rails? Sometimes the carriage can break at the back where the third bearing is. In that case, if you don't have the PTFE tube the filament will drag and tilt the carriage updwards. That would cause the nozzle to swing back and up and cause layer to be shifted and not attached.
[www.hydraraptor.blogspot.com]
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Re: Problem with Layers September 24, 2018 03:57PM |
Registered: 6 years ago Posts: 22 |
Okay...did another tests today, result still the same
Printed a flat piece without any problem
Printed a higher piece and after about 6-7mm of height the Layer broke again
Noticed a little lag during printing, the printer stops for half a second.
Okay, thought it could be, because I stored the print file on OctoPi.
Did another test with the same print file on the SD card, but the same result.
Also moved Z by hand all the way up and down to prove if the screws are moving smooth and they do.
Could also aknowledge, that it seems to affect more axis. Not only Z is involved, after the event occurs the honeycomb infill is destroyed
Anybody a hint how to do tests to search for the reason?
Edited 1 time(s). Last edit at 09/25/2018 02:51AM by dasneo72.
Printed a flat piece without any problem
Printed a higher piece and after about 6-7mm of height the Layer broke again
Noticed a little lag during printing, the printer stops for half a second.
Okay, thought it could be, because I stored the print file on OctoPi.
Did another test with the same print file on the SD card, but the same result.
Also moved Z by hand all the way up and down to prove if the screws are moving smooth and they do.
Could also aknowledge, that it seems to affect more axis. Not only Z is involved, after the event occurs the honeycomb infill is destroyed
Anybody a hint how to do tests to search for the reason?
Edited 1 time(s). Last edit at 09/25/2018 02:51AM by dasneo72.
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Re: Problem with Layers September 25, 2018 03:16AM |
Admin Registered: 17 years ago Posts: 7,879 |
Is the Z axis sitting down on both nuts? If for some reason the Z bars are leaning such that when you level the bed only one nut is bearing the weight, then the Z motion could be erratic.
[www.hydraraptor.blogspot.com]
[www.hydraraptor.blogspot.com]
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Re: Problem with Layers September 25, 2018 04:12AM |
Registered: 6 years ago Posts: 22 |
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Re: Problem with Layers September 25, 2018 07:14AM |
Admin Registered: 17 years ago Posts: 7,879 |
I don't know, my Mendel90s still work fine with the original lead screws.
I would start by installing the PTFE tube that stops the filament dragging on the print head. If the filament is hard to pull it can lift the carriage. Even if it doesn't it pulls towards the centre at the edges of the print and increases backlash, that is why it is in the design.
[www.hydraraptor.blogspot.com]
I would start by installing the PTFE tube that stops the filament dragging on the print head. If the filament is hard to pull it can lift the carriage. Even if it doesn't it pulls towards the centre at the edges of the print and increases backlash, that is why it is in the design.
[www.hydraraptor.blogspot.com]
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Re: Problem with Layers September 25, 2018 07:26AM |
Registered: 6 years ago Posts: 22 |
Quote
nophead
I don't know, my Mendel90s still work fine with the original lead screws.
I would start by installing the PTFE tube that stops the filament dragging on the print head. If the filament is hard to pull it can lift the carriage. Even if it doesn't it pulls towards the centre at the edges of the print and increases backlash, that is why it is in the design.
okay... I will order the tube again and do some Tests.
Thank you very much!
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Re: Problem with Layers September 25, 2018 09:53AM |
Admin Registered: 17 years ago Posts: 7,879 |
Don't forget to anchor it at the spool end. I.e. like the original dust filter.
[www.hydraraptor.blogspot.com]
[www.hydraraptor.blogspot.com]
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Re: Problem with Layers October 05, 2018 10:56AM |
Registered: 6 years ago Posts: 22 |
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Re: Problem with Layers October 05, 2018 01:38PM |
Admin Registered: 17 years ago Posts: 7,879 |
It should carry on where it left off, so the worst would be a blob. Seems more like some lines of G code go missing.
Have you been able to reproduce the effect at will?
Possibly a faster PI might help but I still use RPI Bs to run my machines. I haven't updated Octoprint for a long time though as it does seem to get slower with each new release like most software. I try to stick with versions that work and only update if I have to.
[www.hydraraptor.blogspot.com]
Have you been able to reproduce the effect at will?
Possibly a faster PI might help but I still use RPI Bs to run my machines. I haven't updated Octoprint for a long time though as it does seem to get slower with each new release like most software. I try to stick with versions that work and only update if I have to.
[www.hydraraptor.blogspot.com]
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Re: Problem with Layers October 05, 2018 05:59PM |
Registered: 6 years ago Posts: 22 |
Sorry, only registered users may post in this forum.