Customizable hooks for Dieter Rams' 606 shelving system

These are hooks to hang things into the E-track of the 606 shelving system designed by Dieter Rams in the early 1960s and made to this day by Vitsoe.

The design is parametric for use in OpenSCAD with its built-in customizer tab. You can generate STLs from there. For convenience I've provided some STLs for basic geometries that should work as printed out of the box.

Two different kinds of attachment are possible:

• Clip-in hooks that clip into the holes of the E-track directly - either one hole for shorter hooks, or two holes for longer hooks and added vertical stability. They fit into the E-track anywhere. 
• Peg hooks that are inserted into the E-track like the standard aluminum pegs of the 606 system. Standard 606 pegs have two "belly" segments, you can print the peg hook with either one or two segments.  

Clip-in hooks can be printed without supports if you have good build plate adhesion. Peg hooks will need small supports. Best print them in a colour that matches your E-tracks (gray-ish for aluminum tracks, and black for black tracks) or your wall. The examples in the photos are yellow for clarity

The geometry ties to be as close to the basic parameters of the 606 system as possible: the width of the hooks and the round attachment points is the same as the E-track holes (8 mm). The length of the hooks, as well as the vertical distance for the two-hole clip hooks, follows the distance between standard E-track holes, which is 71 mm. If you have the old E-tracks with 142 mm distance, or the rare SDR E-tracks with 35.5 mm, you can customize the design accordingly and make your own hooks.

In general the clip-in hooks should be preferable, because they are less wobbly and more stable and secure. However, the peg hooks look a bit more "606-y".

A note on the peg hook design: these hooks are made for 3D printing. Do NOT print a peg hook to hang bookshelves on it, even though the geometry would fit. Hanging bookshelves on a 3D-printed peg is a Bad Idea. If this is what you want, I guess you could mill a peg hook from aluminum if you have a 4-axis mill, or a 3-axis mill with good registration to flip the peg over. The result be very 606-y, but also a bit complicated :)