It typically takes around 40 seconds to print a label on copy paper, trim it, apply it, and tape it down:

• Printing the label: 5 seconds
• Trimming the label with scissors or a paper cutter: 10 seconds
• Applying the label: 15 seconds (assuming a clean, flat surface)
• Taping down the label: 10 seconds

VRETTI 420B
EBAY  .04 PER label.
Temu  .3 per label
Calibrates to label

Labels Muotich


.98" core with 4.3" diameter

 Possible

I couldn't find official information about the Vretti 420B specifically being compatible with OSX 10.11.6. However, the Vretti 420B uses a USB connection for macOS and is advertised to be compatible with various operating systems, including Mac [1]. This suggests that it should work with OSX 10.11.6 as well.

There is also a YouTube video that shows how to install the driver and print on a Mac laptop [2]. This further reinforces the idea that the Vretti 420B should be compatible with macOS.

In any case, even if the official compatibility doesn't list OSX 10.11.6, you can still try using the printer with your system. The worst that can happen is that the driver won't install or the printer won't work correctly. In that case, you can contact Vretti support for further assistance.

• Compatible with Different Platforms: VRETTI 4x6 shipping labels fit for transportation and e-commerce platform compatible with USPS, UPS, Shopify,Etsy, Amazon, eBay, PayPal, Poshmark, Depop, Mercari, etc.
• Compatibles With Printers: VRETTI printer labels are perfectly compatible with MUNBYN, Rollo, iDRPT, Polono, Jiose, K Comer, LabelRange, OFFNOVA, vretti , Phomemo and other direct thermal printers without the hassle of sheet waste, or jams. Support for vretti any thermal label printer