Móc khóa Spinner Búa Thor (Mjolnir) (print in place)

This is a remix of Thor Hammer keychain but with a twist (the hammer head is a spinner),
The original one is perfect for multi color print with single extruder.

The idea for this is from Aliexpress product with the same functionality.

There are two version:
1. the hammer head is on the bed so no support needed
2. the hammer head have a little cup on top so support are needed