I've still don't have a “2d” printer, but you can print skin for the blocks, here I am putting the links to the magnets and to the skin generator, this version has thinner walls for the magnets, better grip, etc…

Magnets:

https://www.miravia.es/p/1000-bolas-magneticas-de-0118-in-para-alivio-del-estres-1-colores-colores-plata-1000-unidades-originales-para-hombre-i1368526089615103-s2086074051561215.html?

Skin / Texture generator:

https://www.pixelpapercraft.com/print/minecraft-block