Using Comet 107’s quarry design; multi-level with extensions, for terracotta and low-level resources.
Vanilla Minecraft SSP; still in 1.13.2 :(
Important note for this setup: the bore heads can get caught on blocks under bedrock - I'll decrease the counter on the lower quarry to 8 and bomb out a couple more levels, to decrease the likelihood of running into this while still getting the low level resources.
Quarry Review
The quarry (includes world download):
• A poor-man's Quarry (With world download)
The duper (tutorial by Rays Works):
• Easiest Way to Dig a Hole! | 3D TNT Quarry...