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Nevermind, I finally managed to print the part, sliced in Slic3r PE, the trick was to print it slow, at 50% speed and to use 0mm between supports and the part itself and a solid top layer of the supports. The inner floating ring wouldn't stick on the supports with the default 0.15mm gap that Slic3r PE sets, this would make the print head catch on the ring and cause serious problems with the print.
Hopefully I can remove the supports but I think it will take some effort to make it clean, at least the part printed.
Thanks for your help!!