I normally don't start Minetest from the consol, but did today and noticed the 3d_armor_boots_diamond.png message. I'm baffled on how it happened. Somehow I missed a reference to the image in the blend file that I exported to b3d in the 3d
_armor mod. I'll fix it asap and send a pull request to the 3d_armor repo.
Sorry about that :)