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miles-h2
(@miles-h2)
Eminent Member
Retraction

What are the settings to make the retraction increase to stop the stringing I am experiencing?

Attachment removed
Posted : 05/07/2019 1:11 am
Dave Avery
(@dave-avery)
Honorable Member
RE: Retraction

you may want to lower the extruder temp 5 deg  and see if that helps. otherwise its under printer settings /extruder / retraction

 

Posted : 05/07/2019 5:43 am
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(@)
Illustrious Member
RE: Retraction

I have never seen stringing that bad; I'd like to know how you are doing it.

Upload you 3mf file for that part, please.

Posted : 05/07/2019 6:29 am
bobstro
(@bobstro)
Illustrious Member
RE: Retraction
Posted by: miles.h2

What are the settings to make the retraction increase to stop the stringing I am experiencing?

The Prusa defaults for PrusaSlicer profiles are 0.8mm retraction with 0.6mm z-hop. What slicer and profiles are you using?

My notes and disclaimers on 3D printing

and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan

Posted : 05/07/2019 6:53 am
miles-h2
(@miles-h2)
Eminent Member
Topic starter answered:
RE: Retraction

I moved the "O" scale insulators to a 1" OC spacing to try to help the stringing but it did not seem to help.

Posted : 06/07/2019 1:13 am
miles-h2
(@miles-h2)
Eminent Member
Topic starter answered:
RE: Retraction

tim-m30:

What is a 3mf file? How do I load it for you to see?

Thanks, Miles

Posted : 06/07/2019 1:22 am
miles-h2
(@miles-h2)
Eminent Member
Topic starter answered:
RE: Retraction

Bobstro:

I increased the length to 4.0 but I did not s=change the speed or any of the other retraction settings. I'm using an Original Prusa i3 MK 3s and the PrusaSlicer 2.0.0

Posted : 06/07/2019 1:29 am
Dave Avery
(@dave-avery)
Honorable Member
RE: Retraction

3mf is the save project file from PrusaSlicer

Posted : 06/07/2019 1:45 am
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(@)
Illustrious Member
RE: Retraction

Posted : 06/07/2019 2:35 am
tom.s33
(@tom-s33)
Eminent Member
RE: Retraction
Posted by: bobstro
Posted by: miles.h2

What are the settings to make the retraction increase to stop the stringing I am experiencing?

The Prusa defaults for PrusaSlicer profiles are 0.8mm retraction with 0.6mm z-hop. What slicer and profiles are you using?

That's what my Retraction is set at: 0.8mm retraction length (not 4.0mm - too much for a direct drive feed), and 0.6mm Lift Z at 40mm/sec.  I get minimal stringing at those settings (more like whisps than actual stringing).

This post was modified 5 years ago 3 times by tom.s33
Posted : 06/07/2019 2:42 am
miles-h2
(@miles-h2)
Eminent Member
Topic starter answered:
RE: Retraction

I have tried several times to upload the 3mf file ( thanks for showing me how to save the file). The forum server keeps giving me an error message saying it will not allow the file for security reasons. 

In the mean time I will try the suggested settings and see if they help.

Thanks to all of you.

Miles

Posted : 06/07/2019 1:14 pm
RH_Dreambox
(@rh_dreambox)
Prominent Member
RE: Retraction

Make a ZIP file of your 3mf file and upload it instead.

Bear MK3 with Bondtech extruder

Posted : 06/07/2019 1:26 pm
miles-h2
(@miles-h2)
Eminent Member
Topic starter answered:
RE: Retraction
  1. Tried .8 & .6 @ 40mm speed. Here is the result, still excessive stringing. I will try to zip the file next.
Attachment removed
Posted : 06/07/2019 4:08 pm
miles-h2
(@miles-h2)
Eminent Member
Topic starter answered:
RE: Retraction

This is the zipped file for the insulators at the last settings of .8, .6, 40mm speed also at 210 nozzle temp and not my normal 215.

Attachment removed
Posted : 06/07/2019 4:26 pm
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(@)
Illustrious Member
RE: Retraction

How long has your filament been stored outside a sealed with desiccant bag?

Posted : 06/07/2019 5:51 pm
miles-h2
(@miles-h2)
Eminent Member
Topic starter answered:
RE: Retraction

It's the end of the roll and about two weeks. You think moisture could be the cause?

Posted : 06/07/2019 8:27 pm
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 --
(@)
Illustrious Member
RE: Retraction

I just printed you parts with my gooeyest filament; and I can say I am impressed you can get them to stay attached for an entire print.  I'm probably due for an acetone bath, but I had to add brims to keep them down.

And webbing ... well ... there is lots of it.  And I honestly can't say why, other than small towers with lots of moves causes a web to form with each move.  Again, this was my worst offending filament (a marble), and it doesn't look as bad as your print.   But I had to reslice to add a brim, and I went with 0.07 layers (more webs) than the 0.1 slice you posted. And your parts are small enough the heat gun trick doesn't really help much ... lol (see video).

SpiderWebs

 

Posted : 06/07/2019 9:27 pm
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 --
(@)
Illustrious Member
RE: Retraction

Here's my first try with your configs, and my reslice.

I can't really suggest anything to help at this point, except to find a better behaving filament.  I suspect even my "better" filament won't help a lot here.  Maybe playing with temps, but I am guessing now. First time I've run into a part that is this stringy.

This post was modified 5 years ago by --
Posted : 06/07/2019 9:34 pm
Jerry liked
bobstro
(@bobstro)
Illustrious Member
RE: Retraction

I had a couple of casualties, but frankly I was surprised these printed as well as they did:

I cheated and used a 0.20mm layer height. The more layers you have the print, the more movement, the more potential for stringing, and the greater the odds of adhesion failing. At this size, I don't think anybody will see much difference, especially if you paint them. I used the $15/Kg Inland PLA (215/210C) I had handy. I believe white is notoriously more difficult to print with, so that may explain some of the results. Disabling z-lift helped, and I slowed all printing speeds to 25mm/s and travel down to 80mm/s. The stringing stayed more-or-less manageable, but a few of the shapes are mangled. I calibrated the extrusion multiplier, filament diameter and linear advance settings for the filament prior to printing. 3MF is attached. I could probably go a bit lower on temps, but this worked well enough.

I think you could get a much higher part density and stable print if you simply line these parts up on a sprue and use flush cutters to remove them.

Are these power line glass insulators for a model railroad?

Attachment removed
My notes and disclaimers on 3D printing

and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan

Posted : 07/07/2019 6:56 am
miles-h2
(@miles-h2)
Eminent Member
Topic starter answered:
RE: Retraction

My thanks to all who have helped. I did not know about trying a heat gun and that is a good tip.

I will try the file from Bobstro and see if it works better. As an alternative I can print the insulators for my train layout one at a time. I don't need that many anyway and they print in less than a minute. It's just the set-up/change time that would not be needed if I could print in mass.

Again thanks to all, you guys are GREAT!

Miles

P.S. My delay was because the MAC was putting the replies in the Junk file. I just found all of your responses and read them. Got to figure out how to keep the Prusa from the trash - LOL. I love this machine it's the best, and I've had others.

Posted : 08/07/2019 1:06 pm
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