This is a magsafe inspired Samsung Galaxy S24 Ultra Case which magnets can be added to make the case compatible with magsafe accessories.

This model is based on the foundation model found here: https://makerworld.com/en/models/179133

Bill of materials:

1.  40ea of these magnets - https://www.mcmaster.com/5862k402/
2.  Borrow a magsafe accessory 
3. Super glue (low viscosity type)

Assembly instructions:

1. With the printed case, put the printed case over the (borrowed) magsafe accessory such as a magsafe charger.  Align the magsafe pattern.  DO NOT USE AN IPHONE, THIS IS THE WRONG POLARITY.
2. Place magnets on the cavities.  The magnets should stick on the case because of the magsafe accessory behind it.
3. Place a small amount of superglue (cyanoacrylate) over the magneet cavity and attach the printed Magsafe cover over it.
4. Allow the assembly to dry (keep the magsafe accessory attached so the magnets don't move around).  If using Cyanoacrylate (most superglue), allow to dry for up to 2 days.  Even the super fast drying Cyanoacrylate will outgas for up to 2 days, the outgas MAY DAMAGE the surface finish on the back of the phone.