Dim3nsioneer

The standard M3x16 or M3x14 screws are still used for all purposes other than the casing. But not for the bottom cover. I would check inside the build volume for a missing screw, e.g. somewhere on the bottom of the print bed.

You might want to try resetting all printer data (on the printer). You will lose all settings except print core calibrations. Then connect the printer through LAN/WiFi with Cura and restart Cura to initiate the material data transfer.

After a reboot of the printer, is the material there in the selection list on the printer?

Yes, the Ultimaker 3 is not produced anymore. There might be some units left in the warehouses of distributors and resellers. Spare parts can be provided five years after a model is discontinued. That means you get spare parts but maybe you have to buy an assembly, i.e. more than just the parts you actually have to replace.

The softest material among the Ultimaker partner materials have a hardness of 85 Shore A. This is pretty much the limit you can go with a Bowden printer for professional usage. Hobby users might try hacks like oiling the inside of the Bowden tube for printing even softer material.

The question is if it did happen on the first maybe three layers or later.

Griffin is the gcode flavor for the Ultimaker 3 and the S-line printers.

Same material family (co-polyesters) but not the identical material. But the CPE profile is indeed a good starting point for PET-G.

At which height / layer of the print did it happen?

Unfortunately not. But I agree this would be a useful feature.

Do you use Ultimaker Essentials Early Access? Then please get in contact with your reseller and ask him for a Digital Factory compatible firmware for your Ultimaker 3.

I see your point. Yes, afaik the brand is not included in the text displayed on the printer. But you can use e.g. "colorFabb XT" instead of just "XT" in the type field and then it should be displayed correctly. The routines for displaying that name on the printer probably come from a time where no strategic material partnership existed (Ultimaker 3 Launch). So it could have been intensional. But with the partner materials and the tendency that people want to have more and more their own profiles it could be that it will be adjusted in future.

Generic materials as defined in Cura should be all compatible with the Material Station. If your Pro Bundle does not let you choose one of those something might be broken with the material table in your printer. In such a case, I would recommend to reset all printer settings. Defining Material Station compatible materials in Cura is not that straigth forward. You can copy a generic material and unlink it from the original material to get it sent to the printer. But you cannot define the Material Station specific properties like depriming temperature etc. in Cura but only in the json file

Afaik the app is indeed not maintained anymore by Ultimaker although it is still available in the Google Play Store. The current recommendation is to use digitalfactory.ultimaker.com on your mobile device instead.

You can change the theme in the Cura configuration. There is a light and a dark colorblind theme too there.