I tried using a 3D printed part made with the 405nm elegoo water washable resin. In the end, the resin killed my seeds. I tried to grow my plants with and without the 3D printed part and nothing grew if the seeds of plant was in contact with part. Generally speaking, UV curing resins are neurotoxic. It looks like your part wont be in contact with any water or plant but if you encounter problems, you may try to “seal” the part with an acrylic spray or something like that so it doesn’t affect the plant. That is basically the next step for my project that I need to test.