This Thing provides an easy way to hang up a calendar without drilling or driving any nails or screws into your walls or doors. It's designed to fit a typical 3M Command Strip and still allow access to the release tab. The post should fit most calendars (without stretching or tearing the hole) and should be long enough for a typical 14 month calendar to be flipped all the way through.

Higher extruder temperatures are your friend for best layer adhesion, but you may have to decrease that to avoid a misshapen post. This Thing takes minutes to print so it isn't any big deal to experiment a few times to find how it prints best on your printer. I found it best to print it on its back with no raft, that way you end up with a nice smooth surface to stick your Command Strip to.

I've had it up for a month now with no issues! The calendar shown is the 2017 Snow Leopard Trust calendar, which has very thick pages and I was still able to flip them all up onto the post.