Thank you for your answers.
We are using Cura 4.3, which I believe is the latest version.
We wanted to use a raft to correct the warping issues we have had with some of our parts, since rafts supposedly give you a better adhesion than a brim. Why are rafts so unusual on Ultimaker as you say? Does the printing quality of the UM3 make their use a bit of an overkill or is there a parameter we are missing?
We checked the default raft air gap on Cura and it is indeed higher than zero (although why is that the case? I understand the need for the raft to not be completely fused with the piece to take it off easily once the print is finished but how can the raft attach itself to the part if we essentially ask the printer to print in the air?). We will try to set it to zero on our next print. I unfortunately have no picture to show you yet since we dicarded our failed prints.
On a final note, we think we will continue using active levelling since it always seem to work well for us in spite of the hanging bits, although it would make more sense for the next version of Cura to heat the print cores after the active levelling to suppress this issue, if I may be so bold.
First of all - using a raft on Ultimaker printers is very unusual - with the exception of very special use cases. I guess you'll get more complete answers if you elaborate a bit more the reasons why you are experimenting with rafts nowadays.
You don't mention which slicing software you use. Default settings usually produce a small gap between the last layer of raft and the actual model. That's probably the cause of the problem and this distance can be set to zero, if PVA is involved (but I'm just guessing - a picture of your model would be nice).
In Cura it's called "Raft Air Gap".
Active leveling on UM3 is nice if it works, but not mandatory. You can configure it to "never", ensure that the nozzles are clean and do a manual leveling from time to time. That's totally sufficient.
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