I figured out the problem.
I was trying to print MakerGeek wax filament, which has a recommend temp of 150C. What I learned was any time the temperature was below 170C, the extruder stopped working.
I set my temp to 175C and was able to print the wax filament, but as a result of the extra heat, I didn't have very good luck in the part not curling.
Why did Ultimaker set the lower limit to 170C?
I assume you did a firmware upgrade?
Are you absolutely sure you did the upgrade for the correct machine? meaning if you have a ultimaker2, you did select that one in cura , and then did the upgrade?
A common mistake if people mixing the Ultimaker 2 and the Ultimaker2+
I would advise to check and do another firmware upgrade just to be sure.
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