Update 15 March 2017:
More update coming for MK2S version.

Update 30 Oct 2016:
Work in progress, removed rear block as there is a flaw in design and dimension. Will udpate soon.

Update 7 Nov 2016:
Design completed, I had printed but yet to install it as i am waiting for my motor damper.

Update 8 Nov 2016:
Installation completed, final fine alignment is done by tighten the prints (compression).

Original Prusa Mk2 kit is hard to build and extremely hard to align. It is assume that a well aligned printer will be quiet and less uneven wear to your bearings.

This is a modified Y-axis block is designed to be a drop in replacement for the "Original Corner Blocks"

All file are version 5.0.

Print time is 4 hour per block.

1. Front - 3.5 hours
2. Rear - 4.0 hours
3. Y motor mount - 1.0 hour
4. 100mm Left Z to rear - 0.5 hour (optional)
5. 80mm Right Z to rear - 0.5 hour (optional)

Adv:
Can be use together with LCD without problem.
Drop in replacement, use lesser nuts and bolts.
Ideal position for Y motor mount
Work with damper or without damper motor configuration (Just need to offset pulley)
Work with IGUS RJZM-01-08, which is 16mm in diameter (1mm bigger than default lm8uu)
Easier way to make PRUSA perpendicular

Some tips by Ryan Neufeld for squaring the printer
https://www.youtube.com/watch?v=4KgG3XVU5so

Note:

1. Motor mount requires 2x nut and washer to compress against rear block
2. I did my print at fast speed, hence sanding was required at some area

Credit to Aaron Yourk and Joseph Tam for their input and inspiration.
Aaron had also made a remix of this design:
https://www.tinkercad.com/users/7Z01p6EVg8r-aaron-yourk