Thanks for the ideas geert, I like what you said about applying the ink to the various materials. The ink is in a cartridge inside the printer but I could probably order a similar type that I could use for this testing.
I was originally leaning more towards the idea of trying to coat the PLA with something that would make it more resistant to the ink, mould release or any lubricant won't work as the prints are being used in a clean room on parts which should have no contamination. I wouldn't know where to start with trying to find an appropriate coating but I think google is my friend for this one.
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geert_2 560
Usually nylon, polyethylene, and polypropylene are very hard to glue. Also PET can be somewhat hard to glue. Maybe you have a chance with these? But I haven't printed with the first three, only with PLA and PET, so I don't know if and how well they print on an UM2.
Before buying filament, maybe you could test what the UV-ink does on cheap parts in these materials? E.g. PE or PP boxes for the fridge, nylon screws, PET bottles,...? On a 3d-printed part it will probably stick a bit more, due to the layer lines that give more grip.
Another option could be to spray the PLA with mould-release spray, silicone oil, or PTFE oil, if your application allows it (outside of the printer!!!)? These can be found in car-accessories shops, brico shops, or art shops.
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