Lego© compatible 2x4 Block

FINAL UPDATE / Statement (18/01/2017 17:00): Three white 2x4 reference blocks just came out of my printer:
- Base
- +0.25
- +0.5
It works like that: you print ALL three blocks in your desired color, resolution and
density. Than you drive in the knobs with an original circular single brick.
Next you check various blocks and positions. Than you choose your desired flavour
which is 'engraved' in blocks

All my further designs you will find all three flavours for your choice. If no flavou