We recommend using the Dymo 450 label printer. They can be purchased for under $100 and are very easy to set up and use. They use the standard Dymo address label for printing FBA labels. There are generic labels available when you need to buy more.
Your FBA labels will print out of a new tab in your browser. After your first label, leave this tab open and click back to the main program. You will then be able to print without leaving the main program.
Here is a test label. You can use this to test your Dymo 450 in Firefox on Mac before starting your FBAPower subscription.
Here is a label ready to be printed.

Click File -> Page Setup
You want the Orientation to be Landscape (sideways image).
You want Scale to be 90%
You want to change format for your Dymo LabelWriter 450.
Click on Paper Size and all the way at the bottom it will say Manage Custom Sizes…
Click here and you will see the Custom Paper Sizes menu. Click the + to add a new custom paper size. Name this FBA Labels.
For Paper Size, put in 4 for Width and 4 for Height.
***Some users have reported that using a scale of 80% and a Paper Size of 3.8 x 3.8, 3.7 x 3.7, and 3.5 x 3.5 were required to get the labels to print properly***
Non-Printable Area is User Defined.
Top should be 1.8. All others should be zero.
Click OK, click OK.

Now click File -> Print
Be sure to choose your Dymo LabelWriter 450.
Page Headers and Page Footers need to all be –blank–.
Match your settings to the image here:

When it looks like this, you are good to go. Click Print and your FBA label will print out and you can affix it to your item.
If you have trouble setting up your Dymo 450 with your Mac, please email us at info@fbapower.com