How can i get this printer to print larger letters

I'm thinking that if the print is larger than the tape then you will need a larger tape it it is available
talk the problem out with your local office supply shop

You have to change print size by choosing a larger font in the software you used to produce the document.

are you printing a windows office documents or documents from the web?

It happens when the documents is on A4 size and the printer is set to print on letter size (which is smaller in size). Hence the printer automatically resizes the prints which result in larger margins and print as compared to the actual document.
Therefore, when you print the documents (Press Ctrl+P) you have to select the paper (A4) from the print properties.

Hope it helps! Good Luck!
CreativeTECH

If you can print the nozzle test then that proves most of the electronics, it could be the driver is screwed.
Since you can get something out that is intelligent e.g. the larger font lettering then it is processing the file sent to it.
By that I mean rasterising it, converting it to dots of ink, so it can print onto the page as the heads moves back and forth.
Why not try another computer and connect your printer to that one, or try a different file, or even send it a file you've printed successfully in the past before you started to have this problem.

Firstly make sure your using the correct drive ZM400 rather than Z4M. if you are using the applications driver make sure of headers and footers sizes and the print area is set correctly. If your using odd sized lables download some new drivers from the Nice Label website, they are far more adjustable that the standard Zebra drivers.

look at your perfences before u print the letter. change the font to a larger size. the web browser that u are using has perferences that print at a certain size font..

The reason that your printer is asking you to load paper into the MPF is that it doesn't think it has that size paper in tray 1 or 2. Make sure that the green paper guide in the paper tray that you want to print from is latched in the correct position. This guide tells the printer what size paper is in the tray. If you have it even slightly out of position you'll get this message.

Check the printer settings by selecting properties from the right-click menu on the printer in the Printers and Faxes folder. Check under Printing Preferences and then Advance for the paper size that is selected and set it to Letter.

You need to adjust the printer using the ajustment utility on the printer itself.