My solder buddy has helpful hands but its feet are too small. I designed this base to give my friend some much needed stability. You can modify the design at:
https://tinkercad.com/things/0m4CUWbw6jF

Update
Added material to the solder roll holder
160mm x 120mm

I made using tinkercad because I like simple.
https://tinkercad.com/things/0m4CUWbw6jF
Just print and slide the feet into the grooves, fits like a dovetail joint.