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I have a problem that I can’t find an answer to. When I produce a model, then create a .stl file, then go to Cura to put in any variables (size, rotation, etc. and then produce a .gcode file for my Creality printer, it looses about .05 inch on the bottom layer. The default demo gcode file that came with the printer prints fine. I have leveled the bed innumerable times but the problem seem only to appear on models that I have created, not on files from other sources. I can’t find any setting that would account for this phenomenon. Can you suggest something?

Alan