I had some problems with my Wanhao Duplicator i3 V2.1. Since a while the printer sometimes stops extruding enought filament at ca. 50%. Yesterday the filament got stuck and it was hard to get it working agan. Now extruding works but just manually (with adjusting the extruderposition in the menu). When I start a gcode everything is working except the extruder. Nothing is coming out of it but the nozzle is hot.
What can I do?
Thank you
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it’s working now 
my print bed was to high
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Was your print bed just physically too high or too hot? I’m having the same issue and have lowered the bed but no luck.
