1) I'm not sure why you want a raft as it is an old technology that you shouldn't need.
2) If you really want a PLA raft, just disable the PVA extruder altogether.
3) Not sure why you care if the PLA doesn't start until several layers later? That's how it's supposed to work with raft.
I suggest you turn off raft. If you are using raft to fix some issue, please explain that issue instead. I guess we need more information. Maybe you want the raft to be part of the final model? We need some more details please.
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Slashee_the_Cow 409
Hi there! AFAIK rafts are usually printed with the support material - in this case I'm guessing that would be the PVA - so the actual model (in PLA) will only start printing on top of the raft.
Rafts themselves aren't nearly as useful as they were in the past - bed adhesion has gotten a lot better, especially from the printer's side. I've never had to use them, although I know some people do to make sure they don't have any trouble removing the print from the bed (I just don't understand why someone would do it on a single extruder printer because you then have to separate the print from the raft).
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