Well it's been a while since my last ible, and I wanted to build something practical this time. And so, I give you my version of a knex CD rack. As you can tell, it is very simple, and can hold most types of cd cases( I happen to use it for my xbox360 games, and works very well as the CDs are a tight fit, so if it is tipped over, they will usually stay in their respective slots). In the second picture, I have it propped upside down and only two CDs fell.

Step 1: Parts Needed

FIRST SLOT:
Yellow connectors: 8
Orange connectors: 2
White snowflake connectors: 2
Orange/red/green rods: 4
Short green rods: 5
Yellow rods: 8

EVERY SLOT AFTER THAT:
Yellow connectors: 4
Orange connectors: 1
White snowflake connectors: 1
Orange/red/green rods: 2
Short green rods:5
Yellow rods: 4

Step 2: Construction of First Slot

This step should help you construct the first slot. Also, make sure the orange/red/green rods (I used orange) are all aligned the same, bottom inward gap of yellow connectors.

Step 3: Additional Slots Construction

Well this is the last step. Don't forget to keep the orange rods in the right gaps. Also, this is infinity expandable (without gravity making it collapse under its own weight), so fell free to keep building it as big as big you need it! Hope you enjoyed this ible! ☺