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It's easy to make #minetest blueprints using the #foss #voxel editor, Goxel.
Here's a short tour of the features I've been using:
http://www.codeforyendor.xyz/goxel-for-blueprints-a-tour.html
@taikedz There's no integration, though it's possible someone could come up with something.
I actually enjoy playing the game, so I just use goxel to work out the blueprint and then "build" things the old fashioned way.
@wos Looks like you could make some v cool icons w this... but is that the intent? Where can it integrate w Minetest? Is it possible to export a Minetest-compatible "nodebox" definition....?