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Broken UM2? - please help :)


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Posted · Broken UM2? - please help :)


One of my UM2s just doesn't want to print correctly. Please see the following pictures of the classical Stretchlet which do not exactly look good.

IMG 0227

IMG 0228

IMG 0229

I have tried everything I can think of. Re-slicing, changing PLA, adjusted the feeder, played around with temperature, reduced the fan speed, etc. Even did a factory reset but still no luck.


I have printed more than hundred of these without any issue earlier.


Anybody have any thoughts on what can be wrong?


Ps. The machine is about 3 months old.


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    Posted · Broken UM2? - please help :)


    Had a print turn out like that before because I accidentally hit ABS when changing out PLA material. In other words, it printed the PLA project at 260. Really screwed things up, oozing and stringing everywhere, under extrusion because the filament was just being pushed into a puddle of liquid plastic in the extruder, etc...

    I'm sure one of the big dogs will chime in with some useful info


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    Posted · Broken UM2? - please help :)

    @Peter Parnes: For me it looks as if your UM2 has a problem with the correct z position. The top of the third bracelet seems to have been printed too high up. Do you see any unusual behavior on the z stage?

    Are the bracelets actually printed at their locations shown in the pictures?


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    Posted · Broken UM2? - please help :)

    For me it looks as much to high temperatures would come to use.

    The fine stringing and the deformed areas indicate very high temperatures. Probably a wrong profile is selected, or the temperature sensor is faulty. After all, no Under-extrusion is recognizable.


    Please check the function of the printer nozzle / heater and temperature sensor.

    Use the menu item: HEATUP NOZZLE, on the device and select different test temperatures. Please compare the set temperatures, with for example an oven meat thermometer.


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