BIAONU UV LED Board for ELEGOO Saturn 4 Ultra

The light engine for the Saturn 4 Ultra — the board under the LCD that decides whether a print cures. People fit one when the printer rips models off the plate at stock exposure, or when the light dies a few layers in. The board carries its own thermistor: overheating is the second most common cause of drifting exposure after emitter wear. Aftermarket part, made by BIAONU.

Specifications

• 405 nm COB emitter sized for the 10" 12K panel
• NTC 100 kΩ ±1% thermistor on the board
• Four leads — two for power, two for the thermistor
• Brass-bushed mounting holes

Compatibility: ELEGOO Saturn 4 Ultra. The seller lists only this model, so we don't extend the fit to the plain Saturn 4 or the 16K revision even though their panel format is close — ask the seller if you run a different variant. Check the thermistor connector pinout before installing; boards in this class come in several revisions.