Magnetic Needle Minder

I designed this needle minder to slot inside my embroidery organizer box. 

It includes a space in the center to insert a 60x10x5mm neodymium bar magnet like those found here.

The needle minder pictured was printed at 0.2mm layer height and 10% infill.

I've included the FreeCAD file in case you need to edit or remove the pieces on the back that slot into the organizer.