You can try FixZPL from, it has been the only solid solution that works in OSX. We use it to print to our Zebra ZP500 Plus label printer to print Amazon ZPL Labels, we use it with FedEx and FedEx Labels. It works great and all the labels print crisp and professional.
The best part is that its not a plugin or driver and I no longer need my old Windows machine to process shipments. Plugins and Drivers are not needed as ZPL drivers are already installed in OSX all you need is the software to process the Zebra ZPL file correctly. All you do is drag and drop your ZPL files onto it and the labels print in seconds. So far FixZPL has been the only professional solution I have found that works 100% in OSX Yosemite. Good luck and hope someone finds this helpful.
It sounds like you didn't try the Peninsula Thermal Driver as it also includes a free extra app called DropPrint with the full version which does exactly the same as FixZPL with some added features like watching a folder for ZPL or EPL files to print so you don't have to drag them onto the app each time and the ability to choose wether to delete or move the file after printing. It also shows notifications to show the file was sent to the printer correctly and as these files from Amazon are ZPL (raw printer code) they will print clearly and correctly no matter what driver or app you use to send them to the printer. I also found that the DropPrint app from the Peninsula Driver will also work with Apple's built in drivers without installing the Peninsula printer driver. Although the Peninsula Driver allows you to print from many other websites that do not support printing on a Mac (not just ones that supply ZPL files).
Their tech team was also very useful and was willing to do a TeamViewer session to my Mac to help me install my printer correctly. As their solution costs the same as FixZPL it to me seemed like I was getting more for my money and the ability to email their tech team directly and get help with the setup made them seem professional.
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Topic or Information Installing a Zebra Printer on Mac OS X 10.5 Applies To Zebra Label Printers Mac OS X 10.5 and later Details Instructions for installing a printer on Mac OS. (Example) Note: The CUPS driver that comes standard on the Mac is compatible with a Zebra ZPL printer but Zebra Technical Support cannot assist with setup and configuration. The instructions provided were performed on a Mac using OS X 10.5 and are shown as an example only. Configuring the Printer: The following examples are all based on the 1.4.2 version of the CUPS driver which requires installation of the Snow Leopard MAC OS. Using Safari for MAC enter either or 127.0.0.1:631/ to access the CUPS driver. On the MAC OS the driver is built-in Configure Printer Settings Printing a test page with Cups Print to File Macintosh Source Eduardo G.