Thanks for your feedback! I have seen your kbricks mini model and I really like it! The little Lego man and his car are looking very cute. Did you also try to print small axles and gears? I was afraid that they would become too fragile and too hard to handle. That's why I made the kbricks cubes 24 mm which would btw. still allow for creating a Lego adapter because 24 = 3 * 8 = size of three Lego studs.
I also like the idea of a kbricks group here on Thingiverse and I created one right away: https://www.thingiverse.com/groups/kbricks