This bracket was created to mount the ramshackle birdhouse (https://www.thingiverse.com/thing:107554) but it could be used for other purposes…

In addition to printed parts, you'll need:

(2) Hex bolts, Zinc plated steel, 1/4"-20 x 1"
https://www.boltdepot.com/Product-Details.aspx?product=195 

(2) Hex nuts, Zinc plated steel, 1/4"-20
https://www.boltdepot.com/Product-Details.aspx?product=2648 

Printed parts:

(2) knobs and (2) ¼" spacers (https://www.prusaprinters.org/prints/78501-14-bolt-knob) 

(1) nut bracket

(1) bracket

Assembly:

See the Demo STL to help.  The demo has extra space between some parts to help you visualize the assembly.  Also it only shows the birdhouse floor.  You'll need to drill (2) ¼" holes in the birdhouse.  You can use the drill guide from https://www.prusaprinters.org/prints/109185-enclosure-handle.