If you only want to print one page, you have nothing to do, but if you want two pages, you can glue or use the pins to assemble

When assembling, push the pins into the vices or press. For safety, print out a double dose needle. 

The pins hold the two sides together properly.

I think it looks fine well with the spotify code keychain.

Print Settings

• Material: Several type Pla
• Nozzle: 0.4mm
• Layerheight: 0.1mm
• Supports:  None
• Detect thin walls: On

Color Changer - Z layer height 

1. Black:    0.00-1.50
2. White:   1.50-1.70
3. Pink:      1.70-2.10
4. Blue:      2.10-2.50
5. Pruple:   2.50-2.90
6. Grey:      2.90-3.00
7. Black:    3.00-4.30