This is a 3D-printed ergonomic charging grip designed specifically for the Joy-Con 2 controllers used with the Nintendo Switch 2.

The model uses 8 pcs och magnets 8x3. I have tried smaller magnets but I think they are to weak. Since the slot is only 9mm wide, using larger magnets will ruin the aesthetics of the model. But you can always add bigger holes in the slicer.

1. Since the magnets need to be very close due to the design of the Joy-Con 2 they interfere when adding them to the model. 
   One way to easily insert the magnets is to add them 2 by 2 (1 on each end). Add Glue on the outer holes. The holes are 8.1mm so they should be tight depending on your printer setting.

2. 

    One way to force the magnets into the holes is to stack them like in the picture and press firmly. Or use a magnet dispenser for 8x3 magnets. Let the glue dry before adding the rest of the magnets.

   

3.  Add glue on top of the magnets and through the slot from end to end, a thin line so that the glue does not overflow. 
   Add the Magnet Cover into the slot. Blue on the left side, and orange of the right side.