Minetest Mod Review: Digtron

The Digtron is a grand machine that can dig and place nodes. When used correctly you can dig a tunnel, pave and road and put in lights all at the same time. Once you get past the crafting of the nodes and building of the machine it's all smooth sailing.

[samuel_towle]

I had a lot of fun with this using placers to set stone tile around the tunnel ceilings and walls while inserting gravel nodes in the middle of the floor to create track roadbed for the advanced trains mod. I also had it placing a light node every 10 or 12 nodes. I basically made a tunnel boring machine. Had to manually add sloped tiles when moving diagonally.
I believe any fuel node like coal will be placed in the fuel container, so it might have replenished what you used.