
For a graphic cross-section look.

Move your 3D model down so it intersects with the build platform at the chosen Z-height.
Set build plate adhesion to none
Optional: in 'Special Modes', set 'Surface Mode' to surface. This slices just the outer contour of the 3D model and ignores the infill etc.

Go to Extensions > Post Processing > Modify G-Code. Add script Pause at height. Change settings to:
Pause at: Layer No.
Pause Layer: 1
Disarm timeout: 1s
Standby Temperature: 0°C
Save the G-code file to a USB stick and print.
The printer is paused after the single layer. Navigate the printer menu to Tune > Abort to actually stop the print.
Tested on