Bulk Spooled Plastic Filament, Maker Shed, $43-46/kg
If you’re buying for someone who already owns a 3D-printer, and you’re looking for a gift that’s sure to be appreciated, consider extra filament. Most printers ship with a few short lengths to get you started (sort of like the itty-bitty cartridges that come with new inkjet printers), but, at normal printing rates for an excited new 3D printer owner, the starter supply is unlikely to hold out for more than a couple of weeks. You’ll need to know what diameter filament the printer requires (either 1.75/1/8mm or 3mm) and whether the operator prefers to print in ABS or PLA. If in doubt, go with PLA. Bulk rolled filament is widely available, online, but, naturally, we would appreciate your business over at Maker Shed.