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Ooze/Retraction Test

by wemperor, published

Ooze/Retraction Test by wemperor Dec 28, 2011
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Summary

While going mad about the ooze of my extruder, I came about several calbibration pieces for testing ooze and retraction. After printing the nice test piece of Hardik about twenty times. I decided to make one that is sliced and printed even faster and shows several problems of ooze in one piece.

Instructions

For finetuning your GCode generator, slice the item and watch for:

-don´t forget to activate cool!
-thin filaments in free space(probably to less retraction)
-thin segments of printed layer (probably to much retraction)

For me it´s still impossible to completely get rid of ooze, perhaps cause of the extruder setup, so further work must be done here.

With an upgrade to the Ultimaker, Ooze is defeated very well using several mechanism present in the slicing software and the machine itself.

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this is a great design for calibrating your extruder's retraction, flow, etc. and to just visualize quickly how slicer settings like 'z-hop' might effect your prints (or not effect them much in my case). Very useful tool to take much guess work out of fine-tuning your printer! Thank you so much for sharing this! Only thing that might help a lot of people a bit more would be to elaborate and expand the section where you only briefly mention what a couple of scenarios indicate... any more wisdom to share? I spent a whole day printing these to get my new 0.2mm nozzles dialed in. The before and after is mind blowing from using your test stl here! Again, thank you for sharing!

Maybe you could post pictures with some text and little arrows and whatnot to show what to do if you see this or that. I think that way would be easier to understand than just explaining it in the description... just an idea, I realize it takes time to do photos up like that. I'd be willing to help if you wanted to send me pics and explanations, I'd be happy to turn them in to decent looking graphics for you to post here... I just don't have the wisdom and knowledge to explain it all myself, as most of my 'solutions' were just trial and error (hence why it took me a whole day haha). But I'm not complaining, far from it! Without this great stl I would not have nearly as good of prints right now and would be spending 10X the time picking, filing, sanding, etc. :P

Just realized how long ago you originally posted this... sorry, lol

Very useful, it helps me a lot to find ideal settings for printing PETG!

A useful part, thanks! I don't really have any issues with stringing, but this allowed me to see how small I can make the retractions before I see issues. It turns out that this made some other parts of the print look a little better! It's great for bridging and overhang testing too, which I will try to fix next.

Very useful model indeed. This little $%#@^& practically gave me nightmares from all my (ultimately successful) attempts to dial-in my settings. ;-)

Very helpfull calibration model thanks!

Fine! Was really useful ;-)

Nice thing, it really helped me dial in the retraction settings on my Ultimaker!

Is the Ultimaker able to print without ooze? I´m thinking to buy one, are you satisfied with the printer?

This thing is brutal towards stringing, nicely done.

I'm glad to see someone else working on this. I'm to the point that I avoid any model with parts that are separated so that it needs to use the Reversal.

I'd love to stop the ooze but my main concern is weak builds.

I'd love to see some samples of the types of adjustments that you are making on Skeinforge.

Thanks!

The biggest factor for strength that I have noticed is layer height, along with print speed. Printing slowly with low layer heights ensures very good adhesion between layers because the nozzle is very close to the previous layer for a longer time, which heats it as the next layer is being added. When I print with larger layer heights I often see delaminating because the layers are not fully melting together.

I currently run tests with the Skeinforge derivative SFACT, which is great cause it
´s easy access and the by far cleaner settings.
Unfortunately the SFACT (Dimensions) ability to stop ooze is pretty worse and for me not working. Included in SFACT there is OldDimensions which presents some better settings for stoping the ooze, if you´re using a Mendel Prusa with stepper driven Ex
truder try high a High "Extruder Retraction Speed" of about 400mm/s. This will fasten up the retract and the reverse.
In older Versions of Skeinforge, there was the part "Oozebane" which gave a lot more settings, may I will give it a try later on.

Thanks for the reply. I'm working with a Makerbot Cupcake with a MK6 Stepstruder and 3rd gen electronics which is a bit of a hybrid. I'll look into the SFACT.

This piece will also help you in setting your speed for bridges correctly... nice!

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