Hi DidierKlien,
I followed the ColorFabb recommended settings for an Ultimaker 2 as they had none for the Ultimaker 3, you can read here: https://learn.colorfabb.com/lets-make-something-clear/
They also used a print head 0.8 instead of 0.4. I will adjust the layer height to 0.15 instead and use 100% flow and report back my findings.
Thank you for your replay.