Ricoh makes office and workgroup laser printers — colour (the P C series) and mono (the P series, the older SP series, and the IM all-in-ones). How the running cost works differs by model, so each is treated on its own terms: the colour P C600 uses a long-life internal drum with no separately-sold drum part, so its cost is purely toner-based; the mono SP and IM models sell the drum and/or maintenance kit separately, with a much longer life, so the true running cost is toner plus those service parts amortised over the pages they last. The cost-per-page shown here is toner-based, and any separately-sold drum or maintenance kit is listed as its own supply. Ricoh publishes page yields for its cartridges, so a per-page figure is shown wherever a cartridge price is known. Each model below is listed with its specs and the toner and service parts it uses.