Nozzle leaking from top beneath the curved washer.

Hi guys,

I have assembled and calibrated a 3DRAG but after the first two prints the nozzle started leaking a black substance from the
top region beneath the curved washer.
I tried to tighten the nozzle but I broke it and ordered a new one. The problem is the new one is still leaking and I cant print anything.
I have tried different temperatures from 160C to 225C but the PLA does not melt when the temperature is low and it leaks when the
temperature is high enough to melt the PLA. I have blue and white PLAs.

Please help.

Thanks.

You will need to provide more information and best to show some photos of the problem.

What kind of hotend is it? What speed are you printing? What is the nozzle size? What is the layer height?........

I have owned 2 different printers but neither had a "curved washer" so I cannot relate to where that is. Most PLA should print at 190c to 200c with no problem. It's very important to determine what hotend you have as it sounds like that is the problem but there are so many different ones that it's impossible to determine without knowing which one.

it seems the problem of extruder with black PEEK. The quality is not good. I met this problem before.

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Hi guys,

Thanks you for your response.
I have attached two photos. The black substance on the nozzle are the leaked PLA.

Thanks.

I had this problem early on, but I solved it by adding a longer tfe inside. What was happening was the tfe tubing was sliding up as pressure built up in the nozzle. After awhile it would begin to ooze out between the peek and brass.
If this is not your problem try teflon tape on the brass fitting.