I built my own 3d printed rotary tool. Design files and Build instructions are available at: https://www.instructables.com/id/3d-Printed-DIY-Dremel-style-Rotary-Tool/
Video coming soon.
I found it useful for 90% stuff that I do, mainly because the motor has just enough power to do the job and keeps the noise and weight low. I see this replacing my 160W Power tool for non-metal things atleast.
This is the first prototype, any feedback is welcome for next versions.
