Thank you @chyll2 for the support! I got used to sanding 3D SLS plastic now I use 3 tools: 1) 6 faces nail buffer. I use Step1 and Step2 faces mainly. 2) DREMEL EZ473SA abrasive brush, 220 grit. Amazing tool for all surfaces, best tool ever for curved lines. 3) Dremel EZ413SA 240 grit flat surface disc. Great tool I use to re-shape the corners and sanding flat surfaces.