Received a 3D printed ceramic calibrations piece from shapeways. As you can see the glazing adds about 0.11mm to the surface:
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And what will you calibrate with these?
His designs. Now he knows how the glazings work in function of size of the piece. I wouldn’t call it a calibration, more likely an experiment, although he will “calibrate” in this case, correct the original drawing to acomodate the glazing variation…