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Ultimaker original with 0.2mm nozzle white teflon connector is clogging ?

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Hi , I installed a 0.2mm nozzle on my ultimaker original and am printing with PET 2.85mm filament at 210c, print speed 20mm/sec , layer height 0.05mm, retraction at 60mm/sec distance 9mm . flow rate 100%. Starts print off nicely and then it clogs the with teflon tube and the filament wont pass that no more. I have specified a 0.2mm nozzle in my settings in Cura already

Any suggestion as to what to change in my settings to prevent the clogging ? what is causing this problem . is it too much flow rate , too much retraction possibly?

Thanks. cura.thumb.jpg.7147dad77d24540030ebbfb6b9c3c5ba.jpg

cura.thumb.jpg.7147dad77d24540030ebbfb6b9c3c5ba.jpg

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9mm retraction will make clogs even with pla. You are moving hot filament to a cold area, that clogs ofc. Retractions of 4.5 should just work, maybe 5.5m

Also PET temperature it's just 210? I thought pet needs much more? I never printed pet

 

Hi thanks for the reply ya its the Innofill brand PET on the spool it says 190 - 210C print temp. PET is low temp . I will try to lower the retractions I am also thinking maybe the flow rate needs a reduction since the smaller 0.2mm nozzle but im not sure. I do know that that the clogging is happending at the white coupling maybe halfway through the print job . Starts off nicely tho.

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You might also want to measure the PET with a caliper to make sure it is in the range of 2.8-2.9. If is not that might be why you are having issues with it.

 

When i print with the 0.4 ultimaker nozzle it works fine. But when I try the 0.2mm nozzle it causes problems. Iv just checked the nozzle and it might be clogged the nozzle is full but nothing comes out of the hole .

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Can you see filament in the nozzle tip? Do you have it disassembled? What is your layer height when you print with the 0.2 nozzle?

 

Hi , nope no filament in the nozzle tip , however when i unscrewed it from the block i could see the nozzle is full. I print at 0.05 layer height. Like i said I get great prints with the stock 0.4m just wanted to upgrade to the 0.2 for finer output. I ordered a cheap 0.2mm nozzle for the ultimaker off of ebay.

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You layers are too small. I recommend you get your nozzle from a trustable resource because china could have bad manufacturing of the nozzles on ebay. Can you post some videos/pictures of what happens with the 0.2 mm nozzle?

 

Sure i can do that , well i have printed 0.05mm and even 0.02 layer height and the prints come out great with the stock 0.4mm nozzle . Just trying to use the new 0.2mm. I was able to get a print done halfway through then i gues my retraction was too high and the platic was getting stuck in the white PTFE coupling , i cleared that jam and put back together but now i get no more plastic coming out of the nozzle end even though it is full of plastic inside so i guess it must be clogged. There could be some residue from other filaments i tried to print with before such as the mouldlay wax and or PLA .

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Flow rate drop?  No.   Speed?  Maybe.

20mm/sec * .2 * .05 (layer height) is 0.2 cubic mm/sec.  At 210C (PLA, not PET) the .4 can do about 2.5 cubic mm/sec with .4mm nozzle.  But this nozzle hole is 1/4 the area so I would expect it can print about 0.6 cubic mm/sec.  So your speed seems okay.  But I've never printed PET and maybe it's much more viscous at 210C than PLA is but I suspect they are similar.

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