The surface the paper was on was :
– Not quite level (hence the T top part of the crown)
– There was some grit I missed under the paper
– And as the pen was held on by rubber bands, at the lower part of the table, it dragged, thus the odd shape for something that should be a bent rectangle
But as a first go of running some g-code on it for 2d (and well, tech 3d as it did raise/lower the pen) it went well.
Really want to know if the marlin linked from the here -> home -> assembly ->.. marlin (I think it is RC7) supports G38.2 for surface probing (for gcode ripper/etc) and also what pin (Z min or max maybe) it is bound to.