A simple impression tray holder to hold 3 trays at a time as the plaster sets. Designed it with a long base so that the whole thing doesn't tip over when it is filled.

I made the slots at a slight angle of 2 degrees sloping backwards so that the trays don't easily slide out when they are filled with plaster. Thats why i printed the model on its side as to avoid the 'stair case' effect on the slopes.

i used 15% infill to give some 'weight' to the model. You can print at whatever infill you see fit.