Extrude This!

This mod, simply enough, seeks to prove how no worldgen changes are needed to new implement filler stones. JEI is recommended to more easily read these crafting recipes. Provided below are the MCreator recipe images.

Crafting recipe for a Vanity Slate:

The tag icon in the center is any extruder-allowed block. The tag extrude_this:extruder_allowed has Andesite, Diorite, and Granite, Jiste, and Ijolite by default. Jiste and Ijolite are new special rocks crafted by stonecutting vanity slates. "Jiste" is a completely fictional rock whose name is pronounced "yist", and "Ijolite" is a real rock that has a Wikipedia page.

Crafting Recipe for an Extruder:

The center-top and center-bottom are gold ingots. The top left and top right are copper blocks, and the bottom left and bottom right are vanity slates. The center-left item is a water bucket, and the center-right item is a lava bucket. The very center item is a furnace.
By giving it redstone power, it can duplicate the block below it, if it is tagged extrude_this:extruder_allowed. The duplicate of the block (if successful) is sent to above the extruder block. Also, the block above the extruder has to be air for the duplication to work.

A note on Create, and any other mod that relies on non-cheap filler stones:

This mod is currently a proof-of-concept, and thus the extruder can duplicate andesite with no cost. Tread carefully. Once I figure out an energy cost, and once I figure out how to impliment config options to MCreator mods, I will make such a config option.