Its the flow that counts!

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So I’ve been struggling to get one particular part to print while many others did with the QU-BD extruders.  After numerous tests and tweaks, I discovered that when the flow is very low, the PLA hardens in the filament tube.  While it sounds simple, this was one hell of a revelation.  Now I can print without issue.  The prints come out beautiful.  The trick for this part was to use a .28 layer height instead of a .2.  I print at 212C at 80mm/s.  I’m going to build a calculator to determine the min flow rate in a gcode file, but its working.  More to come later.  Check out the quality