Help with Print.

So I have a Prusa IV3 12" with Rumba running the stock firmware from the installation guide. I have upgraded the X and Y idler to use the gear instead of the bearings. I also have a cooling fan (Not the Clough design).

I am having issues when printing cylindrical object. It specifically looks like the problem is coming from when the printer finishes a layer and then proceeds to the next. When doing so I believe it is oozing and leaving behind lots of errors.

I have tried to fix the oozing with retractions up to 2.5mm and other things including increasing the Z Axis speed. I am using Simpfly3D and can include any details you would like.

I am including two pictures the first shows the errors from the outside on the left and the right. Please note, if you look in the middle the layer adhesion actually looks rather nice. The second photo shows the inside of the print where you can see the extra material from the oozing.:

http://i.imgur.com/FfSPuGm.jpg
http://i.imgur.com/BwOuQD3.jpg

I would like to know what 3D Print board would recommended? My current settings below:

Retraction Distance: 2.00mm
Retraction Speed: 45 mm/s
Coasting Distance: 0.20 mm

On the off chance you're using ABS, and you're printing at something like 250C, I'd suggest experimenting by re-printing the object with incrementally lower temps..., perhaps try 240, then try 230.

The MF recommended ABS temp of 250 is a "bit" on the hot side, and can diminish the effectiveness of retraction.

OTOH, if none of that applies..., never mind! ;)

I apologize this is with PLA at 210*

..., then I would try slowing down retraction speed, to perhaps as low as 15mm/s, but play with it incrementally of course.

Quote:

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Originally Posted by BLKKROW

I apologize this is with PLA at 210*

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Quote:

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Originally Posted by lakester

..., then I would try slowing down retraction speed, to perhaps as low as 15mm/s, but play with it incrementally of course.

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I have tried speeding up retraction, why would you want to slow it down? I am just curious and wanting to learn?

Also, I have noticed when changing from one layer to another it takes a while for the x carriage to rise.

The machine is not capable of that retraction speed..15mm should be the max.

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Originally Posted by voodoo28

The machine is not capable of that retraction speed..15mm should be the max.

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I will certainly change it!

So I have changed the feed rate to 15 mm/s and I am still receiving the same artifacts. Could it be the Z axis is moving too slow?

Have you changed those settings in the past?....Mine are all default from S3D
by the way are you referring to the line of blobs on the side of the print where the layer change occurs?

Quote:

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Originally Posted by voodoo28

Have you changed those settings in the past?....Mine are all default from S3D
by the way are you referring to the line of blobs on the side of the print where the layer change occurs?

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That is exactly what I am referring too, the side where the layer change occurs it leaves behind that weird trail.

I have tried a lot of settings in S3D to get it to print well. Which it does, it just has problems with thin walls.

thats going to be an uphill battle...if youre doing a cylindrical print, try printing in vase mode.

What I print will not work in vase mode. I will just have to play around with it, maybe try the Z antibacklash mod or change the firmware to increase Z acceleration.

Try these settings in S3D

Under the extruder tab under Ooze control

Check mark Retraction, Coast at End and Wipe Nozzle

retraction distance = 3.00mm
extra restart distance = 0
Retraction Verical Lift = 0
Retraction Speed = 15
Coasting Distance = 0.20
Wipe Distance = 5.00


Under the Advanced tab under Ooze control Behavior

Check only

Force retraction between layers
Only wipe extruder for outer-most perimeters

Leave the rest unchecked

Quote:

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Originally Posted by BLKKROW

What I print will not work in vase mode. I will just have to play around with it, maybe try the Z antibacklash mod or change the firmware to increase Z acceleration.

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Is retraction speed a little low. Maybe that's why you still getting the layer change bloob.

Quote:

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Originally Posted by Chadd

Try these settings in S3D

Under the extruder tab under Ooze control

Check mark Retraction, Coast at End and Wipe Nozzle

retraction distance = 3.00mm
extra restart distance = 0
Retraction Verical Lift = 0
Retraction Speed = 15
Coasting Distance = 0.20
Wipe Distance = 5.00


Under the Advanced tab under Ooze control Behavior

Check only

Force retraction between layers
Only wipe extruder for outer-most perimeters

Leave the rest unchecked

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Quote:

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Originally Posted by Chadd

Try these settings in S3D

Under the extruder tab under Ooze control

Check mark Retraction, Coast at End and Wipe Nozzle

retraction distance = 3.00mm
extra restart distance = 0
Retraction Verical Lift = 0
Retraction Speed = 15
Coasting Distance = 0.20
Wipe Distance = 5.00


Under the Advanced tab under Ooze control Behavior

Check only

Force retraction between layers
Only wipe extruder for outer-most perimeters

Leave the rest unchecked

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I have tested your settings and the cylinder is not 100% perfect it is really close to what it was previously. The inside layer change blobs are a lot better but on the oustide you can see the same issues as pictured on the original post.

Do you have it set to print outside perimeters first or last?

Quote:

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Originally Posted by BLKKROW

I have tested your settings and the cylinder is not 100% perfect it is really close to what it was previously. The inside layer change blobs are a lot better but on the oustide you can see the same issues as pictured on the original post.

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Quote:

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Originally Posted by Chadd

Do you have it set to print outside perimeters first or last?

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Outside in.

You may try to reverse it so that it prints inside first.

Do you have anything set under Extruder/ooze control/extra restart distance? To me it almost looks like you have a negative value set there as it doesn't look like you are extruding a enough material after the retract when it is starting the next layer. You could try to put a positive value in there and see if it looks any better. That will extrude a bit more material at the start of the extrusion.

Or if those marks are at the end of your extrusion you may try to disable the Coast at end setting under the same tab.

Quote:

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Originally Posted by BLKKROW

Outside in.

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