For what it is worth I thought I would post my version of a DIY Vertical Print Washer. I have built two units, a 16x20 and a 11x14.
The washers do not provided segregated compartments but provide maximum diffusion potential combined with a water inflow and outflow (in bottom out top or vice versa).
The tanks are aquariums made of non-tempered glass so that I could drill the holes for the in and outflow piping. The dividers are made from a sheet of plastic lattice. The dividers are held in place by "wire management duct" that I cut in half and then siliconed to the end walls. Since the dividers actually float when the washer is full I had to add the small pipe that runs along the top at either end to keep them in place.
The 16 x 20 uses a 24"L x 12D x 16H 20 gallon tank and the total cost of the washer was about $110 Cdn.
The 11 x 14 uses a 20"L x 10D x 12H 10 gallon tank and the total cost of the washer was about $80 Cdn.
Both washers use washing machine hoses for the in and out flow hoses.
Depending on the in flow rate the washer can anywhere from 1/2 to 4 1/2 changes per hour.