@InventedTiME the link to the german Drucktippps3D forum @Wombley posted contains the basic data collection and a link to my website where the rework itself is described in greater detail - the latter is also linked here in this forum: Things to do first with a new J1 - #47 by Mechanikus
If you have trouble accessing it, drop me a line including from which country you are. I have a quite restrictive access filter running to keep spammers out.