A remix of addamays123's Human Ear: modified with two pilot holes and countersunk holes so that you can screw in onto a wall. It also comes on a slighly raised platform, the idea being that it could function as a coat hook, although I haven't tested if it actually holds a coat. Meshmixer supports are included in the file, which also might cause it to be oriented on the Y-axis at import: simply rotate it 90 degrees to put the supports on the build platform.

Printed it with 0.1mm layers, 15% infill and a brim, on an Ultimaker 1 using Cura: no problem whatsoever.