Tips for printing: Use a large nozzle and larger layer heights to save time.
No infill necessary (unless you want to)
There are in-built holes at the back of the model, designed for small nails (pictured) so you can attach it to the wall. The nail head should be no longer than 4mm in diameter.
My printer failed towards the end because I had a snag in the filament (no fault of the model or the printer!), so in the photograph of the one I've printed, the ends facing you are open - the model is actually designed to have rounded-off, closed edges. If you manage to print one all the way to completion please upload I would love to see it! :-)
Thanks for looking!