UM2 Extrusion problems (again ultimaker has the worst customer support ive ever dealt with)

[evostatic 0]

so since ultimaker isnt responding to my emails i thought instead of paying money for a new nozzle that id try to unclog mine. so i took it all apart and help a propane torch on it until and the pla had burned away. i looked through one end and could see light through the tiny little hole in the end of the nozzle. i put it back together and what do i get? under extrusion and the little click/skip on the bowden extruder. i took of the tube and tried to manually feed it and i felt the it wasn't going through with as much ease. i might not be hot enough or the nozzle is screwed. what weird is that it will print fine for a bit but then start clicking. and when i extrude filament it doesn't just string out of the nozzle, it beads up on the tip. PLEASE HELP!

 

[Dim3nsioneer 558]

How did you unload the filament? If I use the change filament procedure it results in a very fine thread inside the Bowden tube as the unload is performed at a significantly too high temperature. This thread is hardly to not visible by eye but blocks the filament flow as the clearance between Bowden tube and filament is extremely small on the UM2. So, I recommend to clean the Bowden tube as you feel some resistance when inserting filament manually.

About UM support: I don't understand how they could keep customers waiting for an answer (not for a solution) for up to week. Something is still quite wrong there. I can only guess but I think it has something to do with their ticket system. It upgrades every ticket by two levels in urgency from day to day. I think there is something like 6 different levels which means that after three days latest every ticket has the highest priority. This must be very difficult to deal with for the support people. So, I recommend to UM to switch off this urgency upgrade and let the customer choose and eventually upgrade the urgency level.

 

[evostatic 0]

How did you unload the filament? If I use the change filament procedure it results in a very fine thread inside the Bowden tube as the unload is performed at a significantly too high temperature. This thread is hardly to not visible by eye but blocks the filament flow as the clearance between Bowden tube and filament is extremely small on the UM2. So, I recommend to clean the Bowden tube as you feel some resistance when inserting filament manually.

About UM support: I don't understand how they could keep customers waiting for an answer (not for a solution) for up to week. Something is still quite wrong there. I can only guess but I think it has something to do with their ticket system. It upgrades every ticket by two levels in urgency from day to day. I think there is something like 6 different levels which means that after three days latest every ticket has the highest priority. This must be very difficult to deal with for the support people. So, I recommend to UM to switch off this urgency upgrade and let the customer choose and eventually upgrade the urgency level.

 

ok. ill give it a try. any other ideas as to why its clicking?

 

[Dim3nsioneer 558]

ok. ill give it a try. any other ideas as to why its clicking?

 

I guess the clicking comes from the skipping extruder motor.

 

[gr5 2,265]

for up to week.

 

I hear sometimes 2 weeks :(

Smart to ask here.

 

it doesn't just string out of the nozzle, it beads up on the tip

 

Major Clue!!! I think. I hope.

I had this problem a while back. Sometimes it curls and goes back and touches the nozzle but usually if you pull on the loop a little as it extrudes then the gravity of 30mm of filament should keep it straight.

But once even 100mm of filament was not enough to keep it straight - it kept touching the nozzle. Also I had underextrusion. The fix was to take a hypodermic needle (smaller than .4mm) and stick it in the hole and rub it around in a circle hard - careful not to stick it in so far it could damage the teflon piece higher up.

This fixed both issues almost immediately.

After burning to ash did you get the ash out? One method is the atomic method:

http://umforum.ultimaker.com/index.php?/topic/4118-blocked-nozzle/?p=33691