Precision-engineered 2x4 Compatible Brick

I searched for a long time but never found the perfect brick. Either the clamping force was too strong at the bottom or too weak at the top, which made it unusable for me. So I decided to design my own "perfect" brick. I took several original  bricks and measured them to get good average values. I also took into account the small grooves on the inside, which were completely ignored in other models. The result is a copy of a brick that has excellent clamping and building properties.