Self Locking Puzzle Box (Only 3 pieces and no suports)

Assembly:

1. Print all the pieces out in their given orientations.
    
2. Assemble the main piece and the spring piece by inserting a small length of 1,75mm filament through both parts.
    
3. The box can now be rotated on its side so the spring piece moves out of the way while the lid is slotted on.
    
4. If the spring piece is having a hard time springing due to a lack of mass the alternate fill can be printed and a m4 nut can be inserted. 

1. No support is needed 
2. No extra hardware needed 
3. Designed to counter elephants's foot