What this setting does
Enabling Enable clear bed notification/button in Printer Settings makes a "Build Tray is clear" toggle appear directly on the printer card on the Printers Page.
This toggle is how users confirm the bed has been cleared between prints. Without it enabled in settings, the toggle will not appear on the printer card at all.
How to enable it
Go to the Printers Page
Open Printer Settings from the three-dot menu.
Toggle on Enable clear bed notification/button.
Save changes. The "Build Tray is clear" toggle will now appear on the printer card.
Optional: if you want to confirm bed clearance using a physical button on a Raspberry Pi instead of the web UI, see the RPi GPIO Interface guide.
How it works
When a print finishes, the "Build Tray is clear" toggle on the printer card automatically turns off. This signals that the bed needs to be cleared before the next job.
The printer status on the Printers Page also changes to "Bed is Not Clear".
The printer status is also visible in the Printer Selection pop-up when a user is about to send a job.
How to confirm the bed is clear
There are two ways to confirm bed clearance:
In the 3DPrinterOS web interface: flip the "Build Tray is clear" toggle on the printer card to the ON position. The printer status will update and the next job can start.
Via Raspberry Pi GPIO button: if you have a physical "Send Bed Clear" button wired to pin 33 on your Raspberry Pi, pressing it confirms bed clearance without using the web UI. See the RPi GPIO Interface guide for wiring instructions.
The printer owner, Advanced Users, and Organization Admins with Can Print permission can confirm bed clearance. Org admins can also grant this permission to Advanced Users in Organization Settings.
Does this block printing?
By default, this flag is demonstrational only and does not block new print jobs from starting.
To enforce it and prevent printing until the bed is confirmed as clear, an Organization Admin must enable the restriction in Organization Admin → Settings → Printing Section.
Note for Ultimaker users
Some Ultimaker models (for example, Ultimaker 3+ and S5) have their own built-in bed clearance confirmation that appears on the printer screen after a print finishes. This is a separate firmware feature and works independently from the 3DPrinterOS "Build Tray is clear" toggle. Confirming one does not confirm the other.