I got a used Qidi tech dual extruder about a month ago. Im currently using one extruder to print on a glass bed. it works just fine but the printed are not the right scale. i did a calibration test by making a cylinder at 4 inches and then a 3.5", 3",2.5 and so on. the 4inchs is about 3.89 and 3.5 is 3.295, 3 is 2.825. what im trying to get to is that it’s not printing to scale. is there a way to fix this issue?

What slicer, material, settings etc.?

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Need more info! What setting and material are you using?