For my VHF/UHF station I am using a dual band five element log-per antenna, similar to the Elk log-per. It is actually an ideal antenna for portable use, as it can be assembled and disassembled easily and packed in a small size. Now the idea came up to use it for satellite communication with my FT-818. The only thing missing was a azimuth/elevation rotator to track the satellites.
I started with my own design, using a stepper motor for azimuth and a servo for elevation. After a while I cancelled the project, as I had too many problems with electromagnetic interference to the servo.
Searching for an alternative DIY solution, I came across the SARCNET website, and the mini satellite antenna rotator MK1.
I decided to build it, but to separate motors and electronics; purchased the parts and started the 3D print design. Below the details and the final result.
Tripod mount 
Top mount with hub for azimuth motor 
Motor unit mounted to a 32 mm PVC pipe 
Housing for electronics, inside view 
Housing attached to the pvc pipe 
Cutout in the housing 
Rail to attach the housing to the pipe 
Counterweight using two ferrite torroids 
Sensor housing 
Antenna holder 
The whole package ready for portable use 
Test on my balcony
When I first time applied power to the motor drivers, the following happened with a loud bang! Luckily, it was outdoor on my balcony.
My thanks to SARCNET, the software works w/o problems. I only had another EMI problem, which could be solved finding a well screened micro USB cable and adding a few ferrites.