Two things, not one. The N1, M2 and M3 are thermal transfer printers, so alongside the label roll you also need a ribbon — every other NIIMBOT prints straight onto heat-sensitive paper and needs only the roll. The N1 takes narrow labels up to 15mm wide; the M2 takes 20mm to 50mm; the M3 accepts label stock up to 75mm wide, with a 72mm effective print width. N1 rolls do not fit the M2 or M3, and none of the three takes direct thermal stock.
Why there is a second consumable
Direct thermal darkens the label itself, which is why those labels eventually grey in sunlight or heat. Thermal transfer instead melts a coating from a ribbon onto PET film, so the image sits on top of a plastic surface rather than in it. That is what makes these labels resist UV, water, oil and solvents. There is still no ink or toner cartridge anywhere in the range — a ribbon is a thin film on a spool, not a cartridge — but it is a second thing to keep in stock. Our guide to whether labels fade over time covers when the extra step is worth it.
N1 label sizes
The N1 range is built for narrow work: 10×25mm, 12×28mm, 14×30mm, 14×40mm, 14×50mm, 14×60mm and 14×120mm, plus round 14×28mm. Beyond plain white, you get transparent, black, yellow, red and silver, laser silver and gold, luminous stock, cable flags in five colours, silver and white price tags, and iron-on name labels for clothing — the last of those is genuinely useful for school uniforms and survives the wash in a way no paper label would.
M2 label sizes
The M2 range is wider and longer: 30×15mm, 30×20mm, 30×60mm, 30×170mm, 40×20mm, 40×30mm, 40×60mm, 50×15mm, 50×20mm, 50×30mm, 50×70mm, 50×80mm and 50×200mm, with round 30mm and 50mm. Materials run to transparent, silver, black and laser finishes, plus essential oil labels in white and kraft at 20×40mm and 20×50mm.
M3 label sizes
The M3 is the wide one: 300dpi like the M2, but it accepts media up to 75mm wide and prints across 72mm of it, at up to 50mm/s and over label lengths from 8mm to 350mm. In practice that means a fixed-asset card, an equipment plate or a warning label can carry a large barcode and readable text, instead of choosing between them.
It runs the same PET label stock as the M2 — which today tops out at 50mm wide, so the sizes above are what you can order right now. We are working on wider rolls to match the machine; if you need a specific width, ask us before ordering.
Ribbons — and the part people miss
Ribbons are model-specific. The N1 ribbon comes in white, black, red, blue and green; the M2 ribbon adds gold to that list. An N1 ribbon will not fit an M2, and the M3’s wider print area needs a wider ribbon than the M2 takes — ask us which one your machine needs before ordering.
Here is the part worth knowing before you buy: the ribbon sets the print colour, not the printer. Every direct thermal NIIMBOT prints black and nothing else. Load a white ribbon on an N1, and you get white text on a black label; load gold on the M2 and you get gold. If you want coloured or metallic printing, thermal transfer is the only way to get it from this range.
Cold chain and lab work
This is where the M2 and M3 earn their keep, and the reason labs buy them. The M2 range includes a −80°C line — tube labels plus 9.5×25mm, 25×13mm, 30×14mm, 30×20mm, 40×20mm and 40×30mm — designed to stay stuck and readable in a freezer. There is also a dedicated −196°C liquid nitrogen label at 25×13mm for cryogenic storage; our M2 cryogenic write-up goes into that use case.
What will not fit
Direct thermal rolls from the D, B or K series do not work on the N1, M2 or M3 — no coating to darken, so you get a blank label. The reverse is also true: PET thermal transfer stock will not print on a direct thermal machine. And N1 rolls are not interchangeable with M2 or M3 rolls because of the width gap, though the M2 and M3 share the same PET range.
Which one do you need?
Use the N1 for cable and wire marking, asset tags, jewellery tags, and clothing labels — anything narrow that has to survive handling. Take the M2 for wider product and sample labels, and for anything going into a freezer or a cryogenic store. Step up to the M3 when the label itself needs to be bigger — asset cards, equipment identification and warehouse labels up to 75mm wide. All three live in the thermal transfer range, and every printer ships from our Singapore warehouse with a 1-year local warranty.