This is the same quick release extruder block as the original except it is rotated 90 degrees so that the motor protrudes out of the back.I built this as part of a bigger on-going project I'm working on to increase the Z axis limits, which can be found here: https://www.youmagine.com/designs/loches-z-axis-upgrade-for-prusa-i2If you're going to use it, keep in mind that some carriages have the X axis belt positioned in the way of where the motor is supposed to go (I got around that problem by flipping my x carriage upside down, kind of a hack but it works).