Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5730747.
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. https://help.prusa3d.com/article/color-change_1687
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.