If the top of the stand is removable (as appears to be the case in your pictures), pack up the end furthest from the sink. If it is not removable, put something under the two legs of the stand which are furthest from the sink (EDIT: On closer examination the support seems to be screwed to the wall, so heightening the leg won't work - just drill a couple more holes to allow the whole thing to tilt). Possibly I am misunderstanding the question as these options each seem simple enough to do?

I'm jealous of your print-washer - I'm using a Kodak print-siphon in a 30" square tray, all placed in the shower for drainage!