How do do i smooth out my 3d printed parts?

[CC Clarke]

What I will be saying here is complete hearsay, I have not tried this. I saw a post where a person painted on resin for 3D printer. Cured it (put it in the sun) and sand.

Applying and curing resin on PLA and other FDM filaments is an established technique that yields good results as long as small tolerance details aren't accidently filled in. This video goes over the various methods of FDM-printed layer line reduction. The resin application begins just before 5:00. He recommends curing the resin in direct sun, but I would not recommend leaving PLA in direct sun for more than a couple of minutes to minimize warping.

3D Printing Hack - Smoothing 3D Prints with Resin! - YouTube

I use a set of Wham-Bam slap mats he mentions to keep my resin printing area clean. Good products: Slap Mat – Wham Bam Systems (whambam3d.com)

I use this for resin curing, it accommodates large parts too: Phrozen Cure Luna | Curing Lamp for Resin 3D Printing – Phrozen Technology (phrozen3d.com)

CCC