I just got a kopykake projector for christmas and I tried using it off of the stand to paint a quote onto the side of a cake but I couldn't get it to really work for me because my hand and fingers kept getting really cramped from how I had it set up. Is there any easier way to use the 300xk projector to trace images onto the side of a cake without getting hand cramps? greatly appreciate it!

Oh my that's some ? :)  It very hard to understand/help without seeing exactly how you have it set up and what condition your hands are in. 

One thing I can suggest is to make sure the cake is elevated to eye level.