This is a simple Triquetra (Trinity Knot) bookmark fully 3d with the knot woven rather than just an extrusion to give it a more pleasing look.  I think it looks best printed in two colours.  To do so, you can just use the prusa slicer to do a layer based colour change.

I printed on my prusa mini with 0.1mm layer heights using overture PLA professional for the matte black layer and the blue green colour was ERYONE Silk Dual Color Filament. 

I have posted two versions a shorter and longer version.  For reference the pictured ones were made using the posted gcode and are of the shorter version, but both versions fit on a prusa mini.