Upgrade or fix your 3D printer!With the Monoprice Replacement Door Open Sensor for Ultimate 2 (36045). Designed for the Monoprice Ultimate 2 3D Printer. When changing parts on your 3D printer, always exercise extreme caution. It is recommended to contact Monoprice before making changes to your 3D printer.Warranty: Replacing parts on your 3D printer may result in its warranty being voided. If you are having difficulty and are unsure if your printer is still under warranty or wish to prevent voiding your email@example.com for assistance.Safety: Always exercise extreme caution when working on any electrical device, including your 3D printer. Ensure that the power plug is removed and the printer has fully cooled down prior to working on the printer.