If I move label formats from the ZT411 to the ZT421, will positions change?

The first dot position reference differs. Per the user guides, the 203 dpi first dot position is 3.5 ±1.25 mm from the inner edge of the media on the ZT411 and 2.5 ±0.9 mm on the ZT421; per the ZT411 spec sheet, the ZT411 is also 2.5 mm (-0.5/+1.0 mm). After moving a format, check the horizontal position with a test print.

Does the ZT421 at 203 dpi print barcodes as fine as the ZT411?

Almost the same. The 203 dpi bar width range is 4.9-49 mil on the ZT411 and 5-50 mil on the ZT421, and at 300 dpi both models are 3.3-33 mil. If you need thinner bars, go to the ZT411 600 dpi (from 1.6 mil).

Do the two models have different operating temperatures?

They are the same: 5-40°C for thermal transfer and 0-40°C for direct thermal, at 20-85% humidity (non-condensing). When using thermal transfer in an unheated warehouse in winter, keep it from dropping below 5°C.

ZT411 vs. ZT421: do you need a 104 mm or a 168 mm print width?

If the content to print on the label is wider than 104 mm, choose the ZT421; if it fits within 104 mm, choose the ZT411. If you also use small labels 25-50 mm wide or need 600 dpi, choose the ZT411, because the ZT421 does not offer those.

The two models are Zebra ZT400-series industrial printers with the same body height and depth, memory, media roll, and ribbon length and core. What mainly differs is print, label, and ribbon width, top speed at 203 dpi, and the length printed continuously in one go.

ZT411 and ZT421 specification comparison

Item	ZT411	ZT421
Max print width	104 mm	168 mm
Label width (tear-off, cutter)	25.4-114 mm	51-178 mm
Label width (peel, rewind)	25.4-108 mm	51-171 mm
Ribbon width	51-110 mm	51-174 mm
Resolution	203, 300, 600 dpi	203, 300 dpi
Top speed (203 dpi / 300 dpi)	356 mm/s / 254 mm/s	305 mm/s / 254 mm/s
Continuous print length (203 dpi / 300 dpi)	3,988 mm / 1,857 mm (ZT411 spec sheet), 1,854 mm (user guide)	2,591 mm (spec sheet), 2,590 mm (user guide) / 1,143 mm
Tag notch and hole position (user guide, from the inner edge of the media)	3.8-57 mm	3.8-90 mm

The ZT421 body is more than 60 mm wider and weighs about 2 kg more. Installation dimensions and weights are listed by model on the ZT411 and ZT421 product pages.

Choosing a model by label width

If the print area exceeds 104 mm, as with 150 mm wide logistics labels or pallet labels, it is the ZT421. If 100 mm box labels and receiving and shipping labels are all you use, the ZT411 does the same job within 104 mm and is 51 mm/s faster at top speed at 203 dpi.

The ZT421 cannot load labels narrower than 51 mm. Sites that use both small labels under 51 mm wide and labels over 104 mm cannot manage with one ZT421, so they split the work across two printers or give only the wide labels to the ZT421.

When loading wide labels on the ZT421, also change to a ribbon at least as wide as the label. For 150 mm wide labels, ribbons of 150 mm or more, up to 174 mm, fit.

Resolution, speed, and continuous print length

At 300 dpi both models are the same at 254 mm/s, so the speed difference is 51 mm/s at 203 dpi. A 600 dpi printhead is an option on the ZT411 side.

For printing long labels as one piece without breaks, the ZT411 has the advantage. At 203 dpi, the ZT411 prints continuously up to 3,988 mm and the ZT421 up to about 2,590 mm, and ordinary labels with gaps between them are up to 991 mm per label on both models at 203 and 300 dpi.

Bar widths and text sizes by resolution are compared in 203 dpi vs. 300 dpi.

Differences seen with tag and RFID media

For tags with holes or notches, the media sensor has to read their position. Per the user guides, the limit for the notch or hole center position is 57 mm on the ZT411 and 90 mm on the ZT421, and per the ZT411 spec sheet, the sensor adjustment range is 1.5-71.4 mm. If you plan to use wide tags with a center beyond 57 mm on the ZT411, test with actual tags first.

For ordinary UHF RFID labels, the encoder is added in the field on both models, so choose by label width alone. Options available on only one model, such as RFID tags for metal assets, are listed on the ZT421 product page.

Consumable specifications shared by both models

Label rolls are loaded on a 76 mm core up to 203 mm OD, 0.058-0.25 mm thick.
Ribbons are up to 450 m on a 1-inch core, and the standard specification is ribbon wound with the ink side out.
The gap between labels is 2-4 mm, 3 mm recommended.

So 76 mm core labels and ink-side-out ribbons used on the ZT411 load on the ZT421 as they are if they are 51 mm wide or more. How to choose a ribbon grade is in thermal transfer ribbon types.