In this hard-surface modeling tip we’re going to cover a quick and dirty (and fun) way of merging two shapes in Blender. No third-party add-ons required.
This isn’t the most pristine way of fusing mesh objects in Blender though – arguably, a better approach would be to use the marvelous Offset Cut experimental tool in MESHmachine (affiliate link).
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More Links:
The Offset Cut tutorial by Artisans of Vaul
Modeling tutorials for Blender by Artisans of Vaul