Here is a simple projector mount I made for use with my HAPPRUN Projector. 
I split it into two halves to be able to print on an MK3S printer with a smaller build volume. 
Base is 228mm x 228mm (~9x9in). Fits compact projectors well. 

To join the two halves, you will need:
3x - m3 hex nuts.
3x - m3 10mm screws.

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