Partnoids! Today I bring you a design I recently finished regarding the old 4x4 piston door. My previous design (some 8 months old) was one of the very first 'compact' 4x4s; redstone technology has changed dramatically since then, so I thought it was about time to modernize my version.
This one is three wide, reliable and has a very fast clean action. I hope you guys enjoy and as always if you don't quite follow something in the tutorial, feel free to check out the world save above!