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takei-naodar

Many Issues with new UM2

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Hi

my problems started with the second print after i did an initial Test Print with the Ultirobot which turned out to be very good.

After that i was experiencing underextrusion which ruined all other prints. I am still in the search for the final reason why....

I now have found the fan in the back of the head is not working and as far as i have read here there could now be a partial clog...... i found a disconnected adaper near the arduino board but i dont know where it belongs..... sadly it is very short and i dont want to damage my ultimaker further than i got it delivered yesterday....

btw i print in 0.1 layers and 50mm/s so i should be below the optimal 8mm³/s right?

list of problems i have/had:

X rod in the back always moves to the left side (Solved)

Underextrusion (solved)

Fan in back of Printhead not working (solved)

i hope you guys can help me out

thx in advance

Takei

 

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The first thing to fix is the fan in the print head. There is supposed to be one unused cable at the running from the electronics board to the print head - that is probably not an issue.

Pull back the netting around the wires at the print head, and look for the pink/blue cable pair. That should go to the rear fan. Make sure it is properly connected at both the print head end, and the electronics board end. It seems there are two possible places it can connect on the board.

If it is on the back of the board at the short end, then note which pins it goes to, and try rotating it 180 degrees to reverse the polarity.

Fixing the fan will probably fix the under-extrusion/clogging issues.

Regarding the sliding rod, you need to push it all the way in, to the 'correct' position. You should then find that there is a gap between the pulley and the spacer next to it, and the bearing in the wall of the printer. This gap is what allows the rod to slide. You need to undo the fixing screw on the pulley by the gap, and slide it, and the spacer closer to the wall, and then tighten the pulley really tight again. This way the pulleys on each end are locked in place, and the rod cannot slide about.

 

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Takei - after you fix the 3rd fan I recommend you do "change filament" and try to get the filament out. If there was a problem related to the 3rd fan the symptom is that the filament partially melts a little above the nozzle and gets wider and causes clogs there in the upper portion of the print head. If you do "change filament" and it comes out easy then probably your underextrusion is something else.

Note also that the 3rd fan should come on the moment you turn on power. If instead one of the side fans come on then just change the connectors around until the rear fan comes on first. The 3 fans have red/black wires leading up to the area that illuminarti discusses in his post above.

 

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Sadly i read your post to late gr5.... luckily i thought of it myself ^^ btw i think it was one of your posts i read which enlightend me with the knowledge of the third fan ^^

one of the crimps on the fan adapter was bad and was out of the adapter..... i fixed it but that is just a temporary solution....i am currently doing a test print to find out if it was the reason.... though i think it was not..... as i looked into the printhead after i removed the bowden tube i just saw clear yellow filament and it came out pretty nicely with change of filament....

Regarding the Rod Issue..... no Spacer much issue.... though i am thinking of a homeprinted solution for that.... i dont want to take the whole thing apart because of 1 Spacer which is just causing me minor problems...

I will report back with the results of the testprint.

thx guys

 

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Regarding the Rod Issue..... no Spacer much issue.... though i am thinking of a homeprinted solution for that.... i dont want to take the whole thing apart because of 1 Spacer which is just causing me minor problems...

 

Are you missing a spacer? Can you take a picture please? Even if you don't plan to fix it.

 

but i needed to use 124% Material Flow. Otherwise everything is good now.

 

What are your important 3: print speed, layer height, temperature?

 

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