Speed difference between two UM2 machines

[kristoffer 2]

Hi

I have 2 UM2 machines, one bought spring 2014 and the second bought autumn 2015.

Both have the same firmware but the latest model is printing/moving ~50 % faster than the older.

I have reset both printers and checked all settings. The gcode file is the same, and has been tested with the same SD card.

I have no idea what causes the problem, but this issues does that I can't print with the same settings.

I've also done the extrusion test for the machines, and the older model can print 3 mm3/s fine, but the newer fails the test right away.

Both with new nozzles/PTFE couplers (And the iRoberts feeder and spool holder)

Any help on how to fix this issue - namely the speed difference.