This model is a 1x Gridfinity bin, intended to store two OLFA Craft Knives.

The bin has no upper rim, and has four 6x2mm magnet slots on the bottom. 

The knives are supported by the circular blade lock, intended to be stored blade down; allowing you to store them opened or closed (as dangerous as you dare, and at your own peril).

I printed this on the MK4S, using .25mm layer height and the “Structural“ preset in PrusaSlicer, with Prusament PLA Galaxy Black. It does not require supports; however, I generally like to use them for the magnet holes.  
 

Happy Printing!