Hi guys, thx for all your help. My project is finally successful. Shower hinge repaired - entire shower cabinet usable now. Let’s give you a short feedback:

• I‘ve chosen PCBway as it was the cheapest with 90€ for stainless steel, laser sintering.
• Other both providers were around 300€ up to 1000€ ( this one in chrome though)
• The production & delivery time was quite long with 2-3 weeks from China. But I‘m not in a hurry.
• I did two plastic prototypes first and discovered always a few new details I didn’t recognize first.
• The metallic print is stainless steel (hope better than Tesla quality) and it‘s fully printed - not the walls only.

At all it costs 130€ for the print, oil, silicone sealant and some other things. Saved me approx 2-4000€ for a new shower cabinet as spare parts were out of production. A picture in comment below.