a 2x2 retractable floor, using double pistons. I didn't want to use sand or gravel, so I had to use a double retractable piston design. Also, everything is hidden, which was another of my requirements.
There may be more efficient/faster designs, but hey, it works.
@Cyclone3365 watch?v=cDNspwp41_Q
it's the same principle
preske 4 months ago