His conclusions were:
- Even blasting helps the final surface quality.
- Additional shells (3 or 4) help keep the print sealed during washing.
- After blasting, the matte surface is prone to absorbing skin oils and other particles, much the way an SLS print does.
- The blasting grit will alter the color of lighter PLAs, the white took on more of a bone hue and the natural clear developed a somewhat murky color. The black PLA blasted to a very nice matte grey.
|White PLA object inside sand blaster|
|Close-up of sand blasted black PLA object|
|Non-sand blasted compared to sand-blasted PLA|
Source with more details and results photos:
Andreas is also well known for his work on e-Nable and Open SLS 3d printer.
If you are more interested in surface finish and smoothing of 3d printed objects with acetone look at: