Calibration Ring One Layer .3mm Height

Hi guys, This is a new revised version of calibration ring. Print at .3mm layer height. It is awesome for seeing the high or low spots for where the extruder is laying the the filament. It is one layer thick so it works well. Designed to fit a square print area perfectly but can be sized in print/slicer software like repetier.
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https://www.youtube.com/channel/UC_iQq2mmhiAU2ACVeDNzVQA