Moving pen around the boundary of your artwork. Watch the paper to verify placement.
Once per camera mounting. Put a sheet on the bed and a pen in the holder; the plotter draws 9 crosses, photographs them, and you click each one.
Photo park position — where the head waits for every scan. Move it until the whole sheet is in view and nothing covers it; the position you end on is saved.
With a rigid pen holder, pressure is set by how far Draw Z pushes the tip into the paper — a tenth of a millimetre too deep scratches and tears. This draws 7 short strokes, shallow on the left to deep on the right, centred on the base Z, with a tick above the first one. Put the pen in and a sheet on the bed.