Brother-TD-4520TN

General Settings

Print Speed: 1.5 in/s

Darkness: 9

Media Name	Method	Type	Width	Height	Exposer Liner Width L	Exposer Liner Width R	Gap Height	Gap Offset
BCS-1J074102-121 / BRS-1D300-110	Thermal Transfer	Label with gaps	4.01 in	2.92 in	0.06 in	0.06 in	0.10 in	0 in

Download and install Linux drivers from Brother Website

There are deb and rpm packages. This will also install a printer utility that allow to define new label sizes

Add a network printer printer-labels.hsgr.awmn

Driver: Brother TD-4520TN

Run thermalprinterui. Select the printer and create new stock on page setup tab.

See Media Settings for values