YTYIN

YTYIN is a broad-catalog marketplace label covering 3D printer electrics and small mechanical parts: UV light boards for resin machines, power supplies, belt drive pulleys, heater cartridges, and fasteners.

No website and no evidence of a factory behind the name, and the product spread — UV panels through to screws — is typical of a trademark applied to sourced goods. We list two YTYIN parts for Elegoo: a UV light board for the Mars 2 and Mars 2 Pro, and a belt drive pulley set for the Neptune 3 and 4. Treat it as a budget replacement, not a branded part.