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How low can Cura go?

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So over my winter break from classes I decided to recalibrate and went through the entire machine from top to bottom making sure everything was the way it should. Caught 4 bolts that were not 100% tight either my fault or just from the machine working. Now, I've printed 5 objects and all came out perfectly. No weird lines or weird layering like I used to have.

I've been printing at 200 microns and I figured with my new found success with prints I figured I could aim to get my prints down/up to the crazy 20 microns that I kept hearing about. First print with Cura, unsuccessful. It came out really rough kinda like sandpaper.

My question is, is it possible to go down to 20 microns with Cura on the default Ultimaker nozzle? I have a print I sliced with Slic3r that's currently printing and from what I see so far, it's pretty smooth so we'll see when it finishes in 2 hours haha. I personally love Cura's interface and if I can, I would definitely like to stick with it rather than switch to another program.

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I've done 50 microns with Cura. But I think it starts to get inaccurate about there. There are rounding problems in the code that start to show with small numbers. I always do 100 microns, which for me is the sweetspot between printing time and quality.

(Also, slicing times start to get ridiculous as you go thinner and thinner)

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Thanks for the reply Daid. Couldn't get Slic3r to make retractions in spots so I gave up and went back to Cura. I managed to do a 40 micron print with the Skin feature. It was a little rough but it sanded down to a really smooth finish which is exactly what I wanted, a few flaws but might be the innaccuracies like you said after 50 microns. I'm gonna give the 50 micron print a go.

Really glad to have an actual conversation with the people directly connected to the software :) Thanks again.

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