Marks on prints

Hi,

So this just started the other day. I have 8 parts on the bed and normally only 2 have marks on the pats. It leaves extra plastic on the sides and its stringy. It seems like when the extruder moves to the next part a small amount of plastic comes out of the nozzle and it sticks to the outside of the next part. How do i go about fixing it?

sounds like another cable problem , look at the other post that explains what to do

Hi,

So this just started the other day. I have 8 parts on the bed and normally only 2 have marks on the pats. It leaves extra plastic on the sides and its stringy. It seems like when the extruder moves to the next part a small amount of plastic comes out of the nozzle and it sticks to the outside of the next part. How do i go about fixing it?

Please provide a photo of this issue.

You can also report it directly to our customer service team, using the support form: http://support.zortrax.com/application-form/

Photos:

https://drive.google.com/open?id=0B91wuEXaJ6hCM2pleC0zYmdOTUk

https://drive.google.com/open?id=0B91wuEXaJ6hCRlE0bXp0QkZOaVk

https://drive.google.com/open?id=0B91wuEXaJ6hCWUdiNko1c1pGSlk

It can get much worse then this!!!

Photos:

https://drive.google.com/open?id=0B91wuEXaJ6hCM2pleC0zYmdOTUk

https://drive.google.com/open?id=0B91wuEXaJ6hCRlE0bXp0QkZOaVk

https://drive.google.com/open?id=0B91wuEXaJ6hCWUdiNko1c1pGSlk

It can get much worse then this!!!

It's easy to remove this with a fingernail  :)

It's easy to remove this with a fingernail  :)

Yes it kinda comes off with a finger nail but leaves makes on my parts. I use this printer for my company I need the prints to come out like they use to!

Yes it kinda comes off with a finger nail but leaves makes on my parts. I use this printer for my company I need the prints to come out like they use to!

Nick, the marks will usually disappear if you hit them briefly with a heat gun, have you tried this?

In my experience these strings and bits are produced when theres a partial clog of the nozzle and it's effecting the normal flow rate (meaning that filament is continuing to flow just a little bit longer than usual so it's leaving strings and producing bits when the extruder moves from one surface to another.

I've been unable to remove the bits without adversely affecting the surface quality and always reprint the part after cleaning the nozzle ( I use a .40mm Tungsten Carbide drill bit and then the .40 wire inserted like a pipe cleaner to insure any clog is properly dislodged).

I've also learned that you can observe the filament leaving the extruder (during "Load filament") and if the filament isn't coming straight out and down then you have a partial clog which forces the filament to curve in the direction of the internal clog. The bigger the clog the sharper the curve of the filament coming out.

I hope that helps. ;-)

Nick, the marks will usually disappear if you hit them briefly with a heat gun, have you tried this?

no i have not. going to check for a clog like the other person said. It just started doing this

so it was not a clog, unplugged the extender cable from motherboard and extruder PCB. didn't fix it. any other ideas??

Did you have the speed setting on high?

Someone suggested high speed setting causes this which is called ghosting apparently. 

Does it happen on all the areas of the Print bed? Meaning if you place the object elsewhere, does it still do that?

I would think it could possibly be cable position. I know I had an area that didn't print as well as the others until I redid my cable. Or even loose heater coupler and in certain positions it gets hotter or colder causing this which has also happened.

Are all the screws that need to be tight, tight? Tension on the belts good? .......etc

Definitely try the XY maintenance procedure, just to eliminate that from the list of possible reasons.

It's not hard and if it's never been done you'll definitely find some loose screws.

Buy a set of quality allen keys for the job.

@nicks3dprintes

stop to disassembly things and looking at wrong direction Julia gave you the correct tip, just remove blobs with finger nail or tools attached with your Zortrax and use heat gun which works like a charm

@nicks3dprintes

stop to disassembly things and looking at wrong direction Julia gave you the correct tip, just remove blobs with finger nail or tools attached with your Zortrax and use heat gun which works like a charm

I'm not sure we're talking about the same "blobs n globs". Mine don't flick off with a finger or disappear with a heat gun.

Nor do they show up on all of the instances of an object that I print at the same time. 

BlobNglob.jpg

Those are stop and start perimeter lines, the nozzle start at a small angle inside the part body and traces the perimeter then crosses its path at an angle back into the part body, usually it happens in the same location vertically and causes a "seam line", there is a setting in the advance printing menu that "randomizes" this behavior but that sometimes has issues too.

The issues I see in your photo would lead me to think there is a flow problem at the transition point causing gaps/blobs and it is most likely a speeds and feeds problem in the slicing software for that layer height and material settings, try other layer thickness and speed settings to see if there is a happy solution.

These sort of issues are why I always keep all version of these software's on a backup and currently I have two (0.0.9.6 and 1.1.0) versions installed in case of issues.