Celing mounted shelf

I designed it to fit a 200x18mm plank

Printed in yellow r-PETG from ReFlow, using a 1mm nozzle, 0.8mm layer height for the looks, though can be done with a much smaller nozzle/layer height.

There is a space for up to 18mm diameter washers, to help hold it up and spread the weight.

No supports required, if the flats face the bed surface.

It's a pretty large print, at 189x222mm, so might not fit on all bed sizes.