Recently tried my hand at printing props and needed a power tool to reduce hand sanding to a minimum. I briefly considered a Dremel, but then opted to design my own powered by an RC motor + gearbox originally intended for a crawler, just for the challenge of it. It can serve either as a classic rotary sander with an ER-like collet for holding bits or as an alternating linear sander with sanding bits clamped on it's tool rod. The toolheads can be swapped by means of four M3 screws in less than a couple of minutes. Additionally, the powerplant is cooled by a self contained 12V 3010 axial fan to avoid cooking the electronics or melting the plastic housing.