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Slic3r crash generating raft with MMU2  

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phantomkingx
(@phantomkingx)
Active Member
Slic3r crash generating raft with MMU2

Trying to create a PLA raft for a PET body, here are the steps to reproduce:

1. Start Slic3r
2. Settings on right panel to:
- 0.2mm FAST MK3
- Filament #1 PLA
- Filament #2 PET
- Printer MK3 MMU2
3. Add STL
4. Change STL part extruder to #2
5. Print Settings -> Support Material -> Raft layers - set to 2

At this point if I export G-code it works, except it makes the raft from the same material as the body, in this case PET. I want it to be PLA extruder #1.

6. Print Settings -> Multiple Extruders -> Support material/raft/skirt extruder - set to 1

Exporting G-code here will crash. Reproducible on Win64 builds of 1.41.0 and 1.41.1 beta.

Posted : 07/10/2018 2:17 pm
phantomkingx
(@phantomkingx)
Active Member
Topic starter answered:
Re: Slic3r crash generating raft with MMU2

I got it to work (i.e. not crash) by also checking 'Generate support material' in print settings. The crash is still a bug however.

Posted : 07/10/2018 2:28 pm
phantomkingx
(@phantomkingx)
Active Member
Topic starter answered:
Re: Slic3r crash generating raft with MMU2

This scenario doesn't seem to be supported properly. Even though G-code generation works, it looks like something is wrong with the G-code. After printing the raft the PLA is not being retracted from the extruder. The MMU unit knows it needs to do a filament change but the gears in the extruder aren't helping pull out the filament.

Posted : 07/10/2018 3:43 pm
Ojrik
(@ojrik)
Trusted Member
Re: Slic3r crash generating raft with MMU2


Trying to create a PLA raft for a PET body, here are the steps to reproduce:

1. Start Slic3r
2. Settings on right panel to:
- 0.2mm FAST MK3
- Filament #1 PLA
- Filament #2 PET
- Printer MK3 MMU2
3. Add STL
4. Change STL part extruder to #2
5. Print Settings -> Support Material -> Raft layers - set to 2

At this point if I export G-code it works, except it makes the raft from the same material as the body, in this case PET. I want it to be PLA extruder #1.

6. Print Settings -> Multiple Extruders -> Support material/raft/skirt extruder - set to 1

Exporting G-code here will crash. Reproducible on Win64 builds of 1.41.0 and 1.41.1 beta.

I'm not sure, but what you care about is this.

Posted : 07/10/2018 5:34 pm
Vojtěch Bubník
(@vojtech-bubnik)
Member Admin
Re: Slic3r crash generating raft with MMU2

I think Slic3r crashes, because it does not support setting the raft extruder for the "Single extruder multi material" printers with non-soluble supports.
We should make Slic3r complain and not slice if you select such a combination of parameters, as we do for the support extruder / support interface extruder.

Posted : 08/10/2018 10:37 am
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