I made this birdhouse to accommodate wrens or chickadees (other similar sized species as well). It has adequate venting and weather-sealed, easily removable wall for cleanout. There are two variations, depending on your printer size and mounting application. I made it to mount to a fence.

It is worth noting that the two version have slightly different entrance diameters.
TOP and BOTTOM Mount: Opening 35mm
DOUBLE TOP Mount: Opening 32mm

Mirror it in your slicer to face the other direction.

Print with PETG or ABS, then paint to help with UV stability. Make sure you use a very wide brim and anything that will help with adhesion to reduce warping.

I used Overture PETG with great results:
https://amzn.to/2Rwhky7
https://amzn.to/3b8o3q4

Look at Print Settings for the recommending setting that I used.

If you found this useful, please consider a SMALL DONATION @
https://www.paypal.me/shanekartz to help cover the time of design.

Please Post your Makes. I would love to see how they turn out.

Thanks, Enjoy!