Features:

• Holders
  • Different sizes for 1/4, 3/8 and 1/2 inch size sockets
  • Conical holders prevent sticking, but allow tilting - Better than the normal ones when used stationary, worse when used in a drawer.
  • Can slide past each other when on neighbouring rails
  • No socket retention (Not necessary for non-mobile tool storage in my opinion, would therefore be needlessly complicated. Most good systems are probably also patented.)
  • Positioning completely flexible, not designed for any particular brand or model of socket
• Rails 
  • Three full rails per grid space
  • Can be tiled in any direction. Half rails on the edge form an additional rail on the seam between neighbouring rail tiles for more placement flexibility.
  • Very space efficient. Depending on nut size, you can reasonably get
    • up to 2 rows of 1/4 sockets per 1 grid space
    • up to 3 rows of 3/8 sockets per 2 grid spaces
    • 1 row of 1/2 sockets per grid space

Print right side up. No supports necessary.