Print Washer
This is similar to the slot processor project, although the construction is made somewhat easier by the fewer number of glueups. Look at the slot processor construction, halve the spacing between the routed grooves to double the number of partitions/slots. Cut the grooves a full 1/8" deep to make for easy sliding in and out of the partitions. Cut the top 1" off of one end piece to allow overflow drainage. Drill 3/16" holes an inch up from the bottom of the opposite endpiece, such that there is 1 hole between each pair of grooves. Take a small scrap piece and cut it to make a small rectangular box to be glued over the row of holes as an intake manifold. Then drill a hole in that small box or manifold just large enough to insert the end of a 1 1/2" length of 3/4-1" acrylic tubing, glued in place, to act as the inlet. To this you will attach your freshwater hose. This should give you an 8 slot archival washer. If you are more worried about time to make it, and less worried about archival washing, you can forget drilling the holes, forget making the inlet manifold, just place one end of it under your bathtub spigot, and let the overflow run out the far end into the tub to drain.