Razor/razor blade is a marketing strategy. Sell/give the base at a low or free cost, and make the money on selling the consumables at a significant markup. The

Razor/razor blade is a marketing strategy. Sell/give the base at a low or free cost, and make the money on selling the consumables at a significant markup. The razor itself also has to be engineered for durability, with springs, latches, etc. While it's a comparatively simple part, it needs to be rugged to last a few years in a moisture filled environment where it's liable to be dropped and otherwise abused. Similarly, the print heads are the precision part in a printer. Drive components in the printer itself -- motor, the belts, rollers, etc, are all pretty cheap and easy at this point; the same print engine will be used over several series of printers. The print heads on the other hand, have piezoelectric parts and/or heat elements that have to be very quick and accurate to do a good job. Both cases, while there is definitely some engineering in them, it doesn't rise to the cost levels we see them being sold at.