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towlerg
(@towlerg)
Noble Member
Multi layer rafts

Up till now I've only used a single layer raft where first layer detail was just too detailed (my theory being PETG will stick better to PETG than glass). I recently realised that Prusaslicer has the option to use multiple layer rafts, does anybody use this feature and if so why?

Posted : 20/09/2020 12:48 pm
cwbullet
(@cwbullet)
Member
RE: Multi layer rafts

I have used it just to mess around.  I have not found a benefit but would imagine it might make it easier to remove from the build plate.  

--------------------
Chuck H
3D Printer Review Blog

Posted : 29/09/2020 12:50 pm
towlerg
(@towlerg)
Noble Member
Topic starter answered:
RE: Multi layer rafts

@charles-h13

Thanks. That was the only use I could find.

Posted : 29/09/2020 3:12 pm
noleks
(@noleks)
Active Member
RE: Multi layer rafts

Hi:

I'm using Prusaslicer 2.2.0 linux64 and I can't see the difference on the plater when I try to print with our without rafts.

Shouldn't I see the raft layers after slicing?  Or is it a "feature" that I just need to trust that the raft will come out.

After uploading to a 3rd party gcode viewer, I still don't see the layers so I am skeptical that this button is doing anything.

I would like to try rafts for a case where I am trying to print a part at an angle where support is needed in most locations under the model.

Posted : 12/12/2020 3:33 pm
bobstro
(@bobstro)
Illustrious Member
RE: Multi layer rafts
Posted by: @noleks

[...] Shouldn't I see the raft layers after slicing?  Or is it a "feature" that I just need to trust that the raft will come out.

They should be visible in preview mode after slicing and definitely in a gcode viewer.

If you want to zip up your 3MF project file with your settings and part and attach it to a reply, we can check out your settings.

My notes and disclaimers on 3D printing

and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan

Posted : 12/12/2020 4:39 pm
noleks
(@noleks)
Active Member
RE: Multi layer rafts

Maybe this is a nomenclature issue.

Attached is a picture from the plater where I requested 30 layers of raft, so I could see what Prusaslicer considered a raft structure.

What I see is actually just support material extended vertically by the number of layers requested.  Even the first layer has spacing between filament lines.

I thought that a raft was a multilayer structure that was essentially filled 100% on the first layer, and then fairly dense on the second and third layers, such that the model and/or support could have very good adhesion to the build plate.

Cura was pretty good at this.

Posted : 12/12/2020 11:45 pm
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