Recommended · for some experience
EEVblog #1347 - SMD Thermal Jumpers could be GAME CHANGING!
Why people recommend it
EEVblog's look at SMD thermal jumpers is recommended for moving heat around a board, with a further remark on how solder mask affects cooling.
Watch for: solder mask discussion sits near the 13 minute mark
In their words
(Dave from EEVblog is pretty self-confident saying it's more efficient without solder mask: [video])
Motla on electronics.stackexchange.com, Nov 2020. CC BY-SA.
SMD thermal jumpers could help move that heat further away.
rdtsc on electronics.stackexchange.com, Nov 2020. CC BY-SA.
