To more accurately assess hover height, I 3D printed this small tool.
Essentially it is a staircase with each step 0.5mm taller than the previous.
Each step is 0.5mm in height.
Each step is a 5mmx5mm square.
At every 1.0mm increment the step is labelled.
I used a digital caliper to measure the thickness of the steps and found it is relatively accurate within +/- 0.1 for each step.
Printer: Bambu X1C
Nozzle: Bambu Lab X1 Carbon 0.4 nozzle
Filament: Bambu Basic PLA
Layer height: 0.2mm
Initial layer height: 0.2mm
Plate: Textured PEI Plate
Because the layer height is 0.2mm:
The whole number steps are very accurate
The intermediate steps such as 1.5mm, 2.5mm are slightly thicker than they should be.
I measured the steps with a digital caliper and had these results:
1.0mm step = 1.04mm
1.5mm step -> 1.63mm
2.0mm step -> 2.04mm
2.5mm step -> 2.63mm
5.0mm step -> 5.04mm
5.5mm step -> 5.65mm
10.0mm step -> 10.04mm
10.5mm step -> 10.64mm