https://www.youtube.com/watch?v=_sw_9ojKUYISaw this tool comeup on yt which was originally for blender. Looks interesting that it might produce some decent results inside max. Max's non-convex packing is ok but still not as good as something like RizomUV, so having a solution for max like the above, which is also slightly cheaper might be a nice alternative.
It's on gumroad
https://gumroad.com/l/uvpackmaster2-max
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send me the link in order to purchase for that version 2023-2024 please
http://www.polytools3d.com/tools/polyunwrapper/index.html
There have also been some updates to Max’s built in packer, with Unfold3d it’s actually pretty good now. Worth another look. https://www.youtube.com/watch?v=W-k2UiIWv9Y