If you like pixel art check out this bulbasaur and keychain. Below are some tips for printing.

AMS Not Required Each color is at a different height. If you do not have an AMS, you can pause and swap colors.

Scaling the Model When scaling in the slicer, it is recommended that you scale based on X and Y coordinates only. This will leave the Z height the same and keep any color changing to a minimum by keeping the layer height smaller.

Keychain Loop For the keychain files, you can move the keyring loop by select the model and pressing "Split into Objects". The keyring loop can then be moved around. After placing it where you want it, select everything and "Merge" the file back together. In addition, you can scale the model before re-merging the keyring loop at your desired location.

Magnets & More You can add negative space in the slicer program to have a place for magnets or create a keychain or earring hole.