This is a compact and sturdy screwdriver.

It features an internal bit container capable of storing 8 bits.

It uses magnets for the lock mechanism. 

Materials: 

• I highly recommend using PETG for the internal part, to make it strong. For the rest of the parts you can use any material you like.
• A little glue 
• 1 magnet size: 6x2mm
• 8 magnets size: 4x2mm

Assembly:

1. Insert magnets 
2. Follow this step-by-step guide:

That's it. Happy screwing!