SimpleMaterialGenerators (SMG for short) is a Slimefun4 addon that helps aliviate some of the grind by providing simple generators that create simple materials.

Currently it adds generators for:
Cobblestone, Stone, Smooth stone, Gravel, Sand, Glass, Netherrack and Soul sand

The generators by themselves will do nothing - at least not until they have a chest (directly) above them.
(There's a multiblock example in the SMG category).
Then they will start producing items.
The Rate of their production is measured in Slimefun Ticks.

You can find the prebuilt plugin in:
https://thebusybiscuit.github.io/builds/waleks647/SMG/master

There are plans to add more generators in the future (once I figure out how to do it)
Namely generators for Dirt, Water, Lava, Obsidian and dusts.