This is a compact Raspberry Pi horizontal rack.

The boards are all placed vertically instead of the traditional horizontal layout.

It consist of a single base a some small supports for the boards you decide to attach.

Advantages of this design:

• Better heat management: the heat goes up and doesn't interfere with the board above because there isn't any.
• No need for fans: heat can freely escape vertically.
• Very compact design: this 5 slot stack has a length of just 14 centimeters.
• Board support: it supports a wide variety of boards and disks.

It supports almost all the available boards:

• B+
• 2B
• 3B
• 3B+
• Zero
• Zero W

It also supports 2.5" Hard Disks or SDD's.

There is enough space below for WIFI dongles (see the picture). 

At the moment it has space for 5 slots but it can be easily edited to support more or fewers slots (if you need more than 5, please leave a comment asking for it).

Requirements:

• It only accepts Right Angle (90º) USB power connectors.
• Some 2.5mm screws for the supports.