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How do I fix these Bumps?  

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frak.n
(@frak-n)
Active Member
How do I fix these Bumps?

https://photos.app.goo.gl/z88sWhGcH4jsmXzS7
https://photos.app.goo.gl/u31jinVcbuxxHf8h7
https://photos.app.goo.gl/cRKXkYs1LCeVURwX9
https://photos.app.goo.gl/4QWf29zgE4E1Ku949
https://photos.app.goo.gl/nfRGdPW3K3EDYo8AA

Why is my top layer always bumpy and stringy? The other layers seem fine. Perfect first layer. I'm using MK3S (single extruder with filament changes). 0.1mm layer height. Hatchbox PLA. Other normal prints seem fine but fine details like these are killing me.

I wonder if there are any retraction settings I could change.

Opublikowany : 20/04/2019 4:40 pm
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(@)
Illustrious Member
Re: How do I fix these Bumps?

Are you asking about the retract - wipe doodles on the letters? It is stringing, plain and simple. You can play with retraction settings, reduce print temps at the last layer, increase the wipe distance... Since different filaments respond differently, the fix that works for you won't be what works for me.

Opublikowany : 20/04/2019 8:51 pm
frak.n
(@frak-n)
Active Member
Topic starter answered:
Re: How do I fix these Bumps?

"reduce print temps at the last layer"

How do I change the temperature of the last layer with Slic3r PE?

Opublikowany : 21/04/2019 5:22 pm
Vojtěch
(@vojtech)
Honorable Member
RE: How do I fix these Bumps?

For that, you need a custom script. Add something like:

{if layer_z > 5.00} M104 S200; 

to your "Before layer change" script dialog. Adjust the 5.00 height to whatever the thickness of your print, minus the last layer (and a half, you're comparing floar numbers) is.

Nevertheless, I don't think the temperature will change much. Removing Z hop, increasing coasting after retract will probably do more. But the easiest way is to simply cut them off with a sharp blade.

Opublikowany : 26/04/2019 6:50 pm
Sembazuru
(@sembazuru)
Prominent Member
RE: How do I fix these Bumps?
Posted by: vojtěch.p6

For that, you need a custom script. Add something like:

{if layer_z > 5.00} M104 S200; 

to your "Before layer change" script dialog. Adjust the 5.00 height to whatever the thickness of your print, minus the last layer (and a half, you're comparing floar numbers) is.

Nevertheless, I don't think the temperature will change much. Removing Z hop, increasing coasting after retract will probably do more. But the easiest way is to simply cut them off with a sharp blade.

When adding an if statement in custom g-code, don't forget to include the

{endif}

See my (limited) designs on:
Printables - https://www.printables.com/@Sembazuru
Thingiverse - https://www.thingiverse.com/Sembazuru/designs

Opublikowany : 27/04/2019 6:57 pm
Vojtěch
(@vojtech)
Honorable Member
RE: How do I fix these Bumps?

When adding an if statement in custom g-code, don't forget to include the

{endif}

Yes, my bad, the statement above was incomplete.

Opublikowany : 27/04/2019 8:13 pm
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