nkuck
Posts: 30
Joined: Mon May 23, 2016 2:32 pm

Coasting problem or ??

Sat Sep 02, 2017 6:27 am

I have not seen this before, and am puzzled by what I am seeing. I haven't done a lot of ABS printing, but am trying to do more with it. This is with ABS.
What I find interesting is that the image showing in the Preview Window is exactly what is being printed! Does this mean that the G-code is at fault? How else could the actual blobs be displayed? One of the worse prints I made relative to surface quality. All of the small blobs are on the actual print. Is this normal? Is it a coasting setting or something else? Thanks for any direction.
[img]1.jpeg[/img]
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SteveIsHeer
Posts: 48
Joined: Thu Sep 24, 2015 5:45 pm

Re: Coasting problem or ??

Sun Sep 03, 2017 11:08 pm

I was getting the exact same issue until I turned off coasting completely and upped my retraction distance to compensate. Without coasting on my corners and start points are normal.
It show's to go you how feelish you fool when your tang is all tungled up and you bart stalking tackwards!

nkuck
Posts: 30
Joined: Mon May 23, 2016 2:32 pm

Re: Coasting problem or ??

Mon Sep 04, 2017 8:31 am

Thanks for the response. I will give it a try. I didn't have coasting activated. What is your setting for retraction?

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SteveIsHeer
Posts: 48
Joined: Thu Sep 24, 2015 5:45 pm

Re: Coasting problem or ??

Mon Sep 04, 2017 9:02 pm

I am using 4.00mm retraction distance,
0.1mm Vertical Lift,
44.0mm/s retraction speed, and a
wipe of 3mm.
I have also told S3D my .4mm nozzle is .34 and that helped a lot.
Extrusion multiplier is set to 0.97
From there you need to get your filament diameter as close as possible and temps and cooling dialed in.
These settings are for PETG at a layer height of 0.1
It show's to go you how feelish you fool when your tang is all tungled up and you bart stalking tackwards!

nkuck
Posts: 30
Joined: Mon May 23, 2016 2:32 pm

Re: Coasting problem or ??

Tue Sep 05, 2017 6:18 am

Thanks very much. Gives me some more options to try.

gwhite
Posts: 138
Joined: Wed Jul 19, 2017 9:37 am

Re: Coasting problem or ??

Tue Sep 05, 2017 8:09 am

Are you sure you don't have a Extra Restart Distance set? It's really touchy, and typically needs to be slightly negative, like -0.1 mm.

nkuck
Posts: 30
Joined: Mon May 23, 2016 2:32 pm

Re: Coasting problem or ??

Tue Sep 05, 2017 8:18 am

Yes, I had an extra restart set at 0.50, presumably a default, as I don't recall ever setting it.
Other settings:
4.00mm retraction distance,
0.0 mm Vertical Lift,
1800.0mm/s retraction speed, and a
No wipe settings enabled
Extrusion multiplier is set to 1.00

See anything that might be an alarm?

gwhite
Posts: 138
Joined: Wed Jul 19, 2017 9:37 am

Re: Coasting problem or ??

Tue Sep 05, 2017 3:07 pm

The restart should be zero or slightly negative. Given that the blobs are showing up in the preview, you can try turning it off & see if that helps.

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dkightley
Posts: 2255
Joined: Tue Mar 10, 2015 4:09 pm

Re: Coasting problem or ??

Tue Sep 05, 2017 3:24 pm

Just for clarification.....the preview shows what the gcode is instructing the printer what to do.....its not trying to show what the finished print will look like..warts and all!

The "Blob" on the preview is an indicator to show where retraction is taking place. Try ticking and clearing the Retraction tick box and you'll see what I mean.

Any "gap" in the extrusion on the preview is indicating that the extruder has been instructed "off" whilst the extruder path is continuing...ie coasting.
Doug Kightley
Volunteer at the National Tramway Museum http://www.tramway.co.uk
Railway modeller and webmaster at http://www.talkingtgauge.net

nkuck
Posts: 30
Joined: Mon May 23, 2016 2:32 pm

Re: Coasting problem or ??

Tue Sep 05, 2017 3:45 pm

Thanks for the clarification of the functions. There are several settings that I know need to be understood better and adjusted. I appreciate your comments.

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