I had this old mini projector, and planned to use it for tracing images on paper.  However, the image was always upside-down. 

Since the projector doesn't have any adjustments, a quick and dirty solution was to make a bracket to mount it 180degrees in the tripod/holder. 

You need a 1/4-20 screw to mount the projector and a 1/4-20 nut to mount the bracket in the stand.

Printed in PLA+ at 0.3mm layer height worked just fine.