This is a cutting board rack designed to fit two IKEA LEGITIM cutting boards. The rack mounts under your cabinet with screws (though you could attach with mounting tape as well). It is two parts, both included in the attached 3mf file.
Since it's two parts, you could also use it for non-IKEA cutting boards, as long as they're a similar thickness - the IKEA LEGITIM is ¼" thick.
I printed in PLA using an 0.6mm nozzle, though the attached gcode is for a 0.4mm nozzle and 0.2mm layer height.
The author hasn't provided the model origin yet.