PLA jamming issues

[adman234]

Hello everyone,

I am having some issues with my H1.1. Printing with PLA, it will work for about 3 days then jam.

When I take apart the hotend, I can see that the PTFE has allowed the filament to swell, expanding inside the PTFE and creating a bulge. This causes a jam once the PLA cools a bit.

I am printing with the new nozzle design, at appropriate temps, with a fan blowing on the PEEK. I'm about out of hope at this point... it's really frustrating to cut new PTFE every 3 days because of the jam.

Should I maybe try to buy a budachnozzle and print with it?

Thanks everyone,
Adam Brown

[adman234]

I also have issues with PLA stringing and leaking out...

I am considering buying one of these and trying to mount it...

https://www.hotends.com/index.php?route ... duct_id=83

Good idea? anyone have any experience?

[Eaglezsoar]

What temperature do have the Hot End at when you are printing with the PLA?

[mhackney]

A more important question is, do you have a fan on your PEEK? If not, please rad the sticky "fan" post in this forum.

[adman234]

Thanks for the replies gentlemen!

I have my temp at around 160, although i have been adjusting it up and down in incriments to no avail.

Also, as I said I do have a small fan on my PEEK, although I never turn it off. Literally, never. It has been running for about 2 months nonstop now. Could it maybe be worn out? Do I need a sort of funnel that channels the air directly to the PEEK or is blowing across it enough?

Thanks for the sticky BTW, very informative post my friend.

Adam

[mhackney]

Adam, if it is blowing air, it is not worn out. It may simply be not directed at the PEEK properly, you may need a funnel or dedicated mount on the H-1. If you have a fan blowing properly on the PEEK, there is very little chance - especially at the reasonable temps you are using - that your melt zine is creeping up. I suspect a misdirected fans, those rascals.

[adman234]

Hmm it's mounted fairly well and pointed right at the PEEK, I think I will try making a little funnel out of some cardstock and see where that gets me.

[adman234]

I picked up that new Jhead Hotend. Print quality is leaps and bounds above what I was getting with the stock nozzle!

I maintain that the seemecnc hotend is NOT appropriate for use with PLA and a small nozzle. That combo simply leads to jams and issues.

[foshon]

I picked up that new Jhead Hotend. Print quality is leaps and bounds above what I was getting with the stock nozzle!

I maintain that the seemecnc hotend is NOT appropriate for use with PLA and a small nozzle. That combo simply leads to jams and issues.

Steve's nozzle works. It is probably the most finicky nozzle I have ever used (although the Magmametal is running up on it). 160 degrees is to low for most PLA. Assuming your temps where correct, which honestly I doubt becuase most PLA won't extrude well enough to print until the 175-185 range, then most likely you had some extreme prussure in that nozzle. If you put that much pressure in a j-head and then do a quick retract, it will jam as well. All IMHO, glad you got it fixed.