"Double Piston Extender" you may have heard of.
But also already from "Triple Piston Extender"?
A Double Piston Extender is a redline circuit which basically works like a piston that extends 2 blocks. A Triple Piston Extender does the same thing only this machine works like a 3 piston.
Instructions:
The horizontal 3-fold piston:



Acacia wood: Input (switch or similar)
Green: Extend
Yellow: Running in
The upward going 3-fold piston:
Exit:


1st part to run in:


Second part to run in:


Light blue: Input
Green: Extend
Grey: Running in
The downward going triple piston:
Exit:

1st part to run in:

2nd part for running in

Third part to run in:

Green: Extend
Yellow: Running in
If interested, I could add a command to create a Triple Piston Extender :D
@Karl31a when did you submit the idea???
It just didn't show up in the stats....
@Blank I've been waiting for over a month now.
@Blank I read that the new design was supposed to come in January 2016.
@Blank
Worse than the Deutsch Bahn
@Karl31a I just find it a bit weird that the waiting ideas are not visible in the queue....
this one took a long time to unlock, but it doesn't bother me that much....
and what's up with "so in that sense :D"???
@Blank well then, was previously unknown to me.
LG Karl31a^^
If you want to hide the redstone, it's just a simple piston...