Guides · Updated 17 October 2026
Thermal label printers for Whatnot sellers: what to look for
Most live sellers already own a thermal printer for postage. The good news: the same kind of printer is ideal for item labels during a show. Here's what matters.
Why thermal?
Direct thermal printers use heat-sensitive labels, so there's no ink or toner to run out mid-show. They print a label in about a second and are cheap to run. Thermal labels can fade after months in sunlight, which doesn't matter for packing labels that go out within days.
What to look for
- A normal driver for your computer. If the printer shows up in your Mac's or PC's printer list and can print a test page, TagPop can use it.
- The label widths it takes. Many "4×6" shipping printers also take narrower rolls, from about 2 in (50 mm) up to 4 in (100 mm).
- Gap sensing. Printers that detect the gap between labels line up each label properly. TagPop has a "Set size & detect label" step for after you change rolls.
- USB connection. Simple and reliable for a show. Wi-Fi and Bluetooth printers can work if your computer sees them as a normal printer.
Common printer types
| Type | Good for | Notes |
|---|---|---|
| 4×6 in (100×150 mm) shipping printers — e.g. MUNBYN, Rollo, Zebra desktop models | Postage and item labels | Load a smaller roll for item labels, or just use 4×6 if you don't mind bigger labels. |
| Brother QL series | Small item labels | Uses Brother DK rolls, e.g. 62 mm continuous or 62×29 mm. |
| Dymo LabelWriter | Small item labels | Uses Dymo label sizes such as 54×25 mm or 57×32 mm. |
TagPop has presets for all of these, plus any custom size in mm or inches — see label sizes for live selling. We test on a MUNBYN 4×6 printer; the free test label tells you in seconds whether yours is right.
One printer or two?
You can use one printer for both postage and show labels. TagPop sets the label size for each label it prints and never changes your printer's default settings, so your postage labels still come out right afterwards. On busy shows, a second cheap printer just for item labels saves swapping rolls. UK sellers: see one printer for Royal Mail and Whatnot.