Board Thread:Off Topic/@comment-26073440-20180826031310/@comment-29646689-20180827200324

Obtain cobblestone.

Use a mod to get a Cement Mixer.

Smash the cobblestone well with a heavy tool, then drop into Cement Mixer with no other materials. Then activate CM for next 6 hours.

Receive gravel from the output slot of the CM.

A massive army of robots with guns