This is a copy of the Upper Rack Wheel bracket for a Whirlpool Dishwasher. The Whirlpool part number is WP8268846. According to the website RepairClinic.com, this part replaces 8268846, 3371581, 3379727, 3380863. This is the bracket only, not the wheel.
Attached is the STL as well as the parent project from AutoDesk Fusion 360. The part was printed at 30% infill with the wheel axle perpendicular to the bed, brim, and "everywhere" support.
I printed one with "Touching Buildplate" support, but it suffered significant deformation on the large overhangs. "Everywhere" Support works much better.
The OEM part is available from Amazon for around $20 >> http://amzn.to/2bsCnyb