Multimeter holder.
This flexible shape allow you to hold various multimeters shapes even if the shape is rounded like with my MS2138R.
I allways add a small pad of foam between holder and multimeter, but it works without too.

RepRap

Prusa i3

Doesn't Matter

Doesn't Matter

0.2 mm

35%

Print it with a brim.
Don't need support (Obviously, you have to flip the object on a side before to print it ;) Or use the "ready to print" stl file that I have added.).
Don't use ventilation.

(mine is printed in ABS)