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I bought a used IIIP and after I got the broken filament out of the delivery tube and downloaded Cura and a few test prints I got it to print pretty good. Then I changed the support settings to None and Brim. It has not printed since. It recognizes the gcode file and I have even preheated it but it will not go to the print screen. It just sets on the gcode file and I cannot even get it to exit. I have to turn it off to get it to reset. I uninstalled Cura and re-installed it but it still will not print. Any Suggestions?