Build Your Own SLA/SLS

Hi dear community,
need your advice on the prob I have:

overall I'm very happy with the results, but the CIRCLES I got on all of my prints, are driving me mad.

Setup:
1) FULL HD DLP 1920x1080, eco mode, 10.000:1 contrast, 2000 lumens
2) 75 microns
3) cure time 5 sec
4) XY resolution - 100-110 microns
5) slice resolution - 3840x2160, using powerpoint

Pic.1 - It's layers, no prob with that








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What can cause such a heavy circles? Any ideas, thoughts please?
Thanks a lot in advance for any possible help!

That is a result of the XY resolution if you lower that it will make those les noticeable. But before you try that (if your able) have you tried the Anti-Aliasing feature in CW? I find it works really well at about 3.5. I know it's basically the same as your up scaling resolution in powerpoint but I would try it first to see if it helps at all.

First of all, huge thanks for fast respond,

yeah nevertheless I'm using old-school CW version 1.0.0.13, I've got Anti-Aliasing enabled (1.5x in that version),
so with resolution 3840x2160, the final slices are of a highest quality.

Yes, of course I'm able to lift up the DLP, so XY resolution will be at least 50-75 microns, but that will sacrifice built area, right?:)
Any more thoughts, or at least are those circles normal at 100-110 microns, or I'm getting really ugly prints?

Thank you all

Hey guys, wanted to ask one more thing please - anyone has tried LASER instead of DLP, right?

Does LASER method has the same circles on print surface, or not?
Any comments please?

Thanks as always!

Those circles are indeed xy resolution.
An other way to handle with this 'issue', could be the printing orientation.
So at least, the circles are there, where you want them...

The laser method. Also here it propably depends on the 'galvo' resolution.
(It's actualy worse, the resulotion will change a little, from center to outside, due to the fixed angle resolution.)

But ofcourse, with the laserpointer it should also be possible to change the curing time per pixel (based on the grey value of the pixel).
I don't know if this is also used for these systems..

Further more, your prints look already very nice!
Thanks for sharing printing settings
What vat-type (fep, sylgard, thickness..) are you using and which resin?

x/y and z resolution. You are going to see those no matter what. Slicing is not a analog process, but digital, and those are artifacts of the digital process. You can minimize them, but never 100% get rid of them.