3D printer prices in Karachi have dropped enough that hobbyists, students and small workshops now buy them, and second hand units appear when someone upgrades or loses interest. Most listings are FDM printers, which use filament spools and are the easiest type to maintain. Ask for a printed sample and check the nozzle, bed levelling and belt condition, since a printer that has sat unused often needs more work than one in regular use. Spare parts and filament are listed alongside the machines here.