Inner diameter gauge (2-20mm)

thingiverse

I designed that test to gauge the accuracy of inner holes in my A5 printer. Notably, the outer dimensions (100mm x 50mm) are remarkably precise within a 0.1mm margin, but the inner diameters consistently fall short, sometimes by as much as 2 mm! I'm using Cura 4.1 to slice the models. Hole diameters are carefully measured as follows: Upper row: 2mm, 4mm, 6mm, 8mm, and 10mm Lower row: 12mm, 14mm, 16mm, 18mm, and 20mm Outer dimensions are precisely 100mm x 50mm x 5mm.