Any model HP or Canon Black-Only Laser Printer or copier will work as long as it has NO capability of printing in COLOR. NO other BRANDS will work. As of 2019,  a few of HP’s NEW Black Laser printers have changed their toner formulation.  Before you buy a new HP printer for this process, please check the cartridge number on HP’s MSDS site to be sure your toner contains either Iron Oxide or Ferrite. http://h22235.www2.hp.com/hpinfo/globalcitizenship/environment/productdata/ljmsdsuseng.html     There is also a link on  the FAQ page at  www.fired-on.com   ALL Canon Black-Only laser printers still  work for this process.