I really like the Pokémon keychains by Mario37, so much so that I wanted to gift them. 
But I needed a box to properly showcase them as a present. 
 

So I made a little Box to present the three first gen starters (Charmander, Squirtle and Bulbasaur) in their respective order as shown in Pokémon blue. As you don't get Pikachu as a starter, I hid him under the inlay within the box for an extra surprise.

On top of the inlay is a small inset to put a sticker / label in. I put in a little „Chose your starter-Pokémon“ label.

I also recommend to put in a bit of felt to avoid clanging of the chains.

Note: Please keep in mind, that the width of the box is dependent on the width of the keychains you want to insert (not every Pokémon has the same dimensions). As such you might need to adjust the following things…

• width of the lid
• width of the case
• width of the inlay
• position of the seperators on the inlay

All parts can be printed without too much trouble or supports, although depending on your printer you want to use some supports for the seperator walls on the inlay.