Spin Brush sander

I saw this video https://www.youtube.com/watch?v=V6T0U9yEw0I a few years ago but didn't really have a use for it but now with 3d printing and using PLA I needed a small sander that wasn't too fast, normal sanders move so fast it just melts the plastic.
Enter the Spin Brush sander I used an old Spin Brush because that is what I had and I have a rounded back and forth sanding surface and a flat square sanding area in one toothbrush, the edges are extended out to get into the tight areas where th