Rollo printer on a Mac: setup and the three usual problems

The Rollo is one of the easier thermal printers to get working on a Mac, because it needs no vendor driver — plug it in over USB and macOS adds it like any other printer. Which means almost everything that goes wrong afterwards is about paper size, scaling, or the shape of the PDF.

Set the default label size once

Do this before anything else. macOS falls back to a printer's default paper size whenever a document does not state its own, and label PDFs frequently do not.

1. Open System Settings → Printers & Scanners.
2. Select the Rollo.
3. Set the default paper size to 4 × 6 or 100 × 150 mm.

If neither appears, add one under Manage Custom Sizes in any print dialog at 100 × 150 mm with all four margins set to 0. Leaving the default margins in place is the most common reason a correctly sized label still prints small with a white border.

The three problems people actually hit

1. The label prints small, in the corner

Two different causes, and they need different fixes. If the PDF is already 4x6, it is a scaling problem — set Scale to 100% and turn off fit-to-page. If the PDF is a full A4 or Letter page with the label in one corner, no print setting will help, because the printer is faithfully reproducing a big page on small stock.

Check which you have with Cmd+I in Preview, then follow the guide on labels that print too small.

2. The label prints sideways

Rollo's own support puts this plainly: it prints what is on the page, in the orientation the page has. It does not auto-rotate. So a sideways label is a rotated page, and the fix belongs in the file.

Rotate it in Preview with Cmd+L or Cmd+R and save before printing. If every file from a given source arrives rotated the same way — which is normal, since the same integration generates them all — that is a rotation you will be applying by hand forever.

3. It spools forever and nothing comes out

Almost always a stuck job rather than a hardware fault. Clear the queue in Printers & Scanners, power-cycle the printer, and send a single job rather than a batch. If it keeps happening, remove the printer and add it again so macOS rebuilds the queue from scratch.

Sending a large batch as one print job makes this worse and harder to diagnose: when something jams halfway you cannot tell which label failed, and reprinting means sending all of them again.

Watch out for the app overriding the printer

A detail that costs people a lot of time: the application you print from can override the printer's paper size. Getting the Rollo's default right does not stop Acrobat, a browser, or a shipping platform from sending Letter anyway.

So check the paper size in the print dialog itself, every time, not just in system settings — or use something that carries the size with the preset instead of asking each time.

Where this stops being a printer question

Everything above is a one-time setup except the parts that depend on the file: cutting a label out of an A4 page, rotating a sideways page, splitting a sheet that holds four labels. Those repeat with every order, because the marketplace keeps generating the same shape.

When the file is a full page rather than a label, our free browser tool crops it in the browser without rescaling, so the Rollo gets something the right shape to begin with.