I have used a unicolor drum for 11x14 inch prints. In some ways it is more pleasant to processve prints this way. The disadvantage is you waste more paper as you don't see the print developing. I found I lost print developer reliability on the 3rd print. Forgot precisely the amount of stock solution I was using....maybe 5 oz of LPD mixed 1:3. Final wash in a tray. I always worried the drum end cap would dislodge resulting in a spill. I migrated to using a single tray method for 11x14s.