Wall Hanger / Katana Holder / Curtain Rod Hanger

This is a remix of "Katana Holder" by noordvyk. I smoothed-out a lot of the edges and made some minor changes to the model such that I think it'll now print nicer.

While the original model was posted as a Katana specific thing, obviously this could be used as a nice general wall hanger for other things, such as curtain rods.