You can make the packer automatically align islands on top of each other.
In case you missed it
UVPackmaster 3 for Blender, a fully-featured UV packing engine, got a small update. Version 3.1.3 brings a stack groups feature, which allows you to make the packer automatically align islands on top of each other before packing and then pack stacked islands together; stacked islands will not be split during packing.
This is a free update for owners of UVPackmaster 3. If you have version 1 or 2, you can upgrade to 3 only paying the difference between the new license price and the price you originally paid. New UVPackmaster 3 licenses cost $44 for one user, $159 for indie studios, and $239 for bigger companies.
Check out the update here and don't forget to join our Reddit page and our Telegram channel, follow us on Instagram and Twitter, where we share breakdowns, the latest news, awesome artworks, and more.