monocultured

The board and head cooled down enough to check, and the nozzle isn't touching the fan assembly. Off to create a support ticket! Thanks for the help all, I'll post any solutions I get. Should you get suggestions I'm still interested though! Cheers

I checked the connections to the board, they were slightly loose so I retightened. No scorching as far as I can tell. Heating the head up worked as previously, but as soon as it reached the manually set temperature it would start to drop again. Restarting the machine didn't help, the head refused to heat up now. I updated the firmware, reassembled the head and everything else, and it heated up fine and stayed at the assigned temperature, and I could increase / decrease the temp. I did a small test print which started out fine (it didn't stick to the bed though, so I aborted) On the second print the print starts coming out blobby again and after a minute the printer stops with: Error - StoppedHeater Error On the support page Ultimaker.com/support I've checked the suggested check 1&2 for the error, so will see if the head is touching the fan assembly (#3). Suggestion 4 doesn't apply, so unless it's touching the fan assembly I'll have to open a ticket... As a side note: The grup screw is what keeps the sensor and heater in the block, right? At least I can't remove them until I loosen the grub, so figure it ought to be tight.

Thanks for the input all. I ended up doing the atomic a couple of times, still no dice. I picked apart the head and cleaned out the nozzle and checked all wires, reassembled and still no good. Might be electronic fault somehow - I'm thinking that the heating block or sensor is tripping a fuse if there is one. I just heated up the head through the menu and it jumped to 200°C with no problems, but then started to cool down again. A quick restart of the UM2 showed the residual temp - still cooling - but it wouldn't go up again. The wires going to the board (temp1 & temp3) look OK, and I've tried resetting the firmware in case that was at fault. So I'm thinking either a faulty heating cartridge or something on the board acting up. I shot a video of the rising / falling temp as well as the exposed heating block: Video (The rattling noise is the loose back fan) Also, while taking the heater block apart the grub screw is all worn out - any suggestions for where to get replacements? Looking to get an Olsson block, but need to see how much repairing this will cost me… Cheers!

Thanks for the fast reply! I haven't tried the temp test yet, but I did feed through more PLA until it was clear. Did a test-print but with same result. Video: http://kkvgbg.se/dremelfuge_fail.m4v Thanks for the suggesting the Olsson block - I'll look into getting one if this doesn't clear up. Will also do the heat test to see if I need to pick it apart and reset the sensor or heater.

Howdy! I'm getting spotty feeds on my U2 - using both ABS & PLA. Tried gluing the surface and change the bed distance to see if it was too close / far away, but with no difference. When feeding manually it extrudes without problem, but once it starts printing it only produces small blobs. I'm thinking that it might be something with the temp sensor or heater block being off - I lent it to a friend and the he had the sensor replaced as it broke, could that be related?