If I make it battery powered it needs to run on a charge for a few months, otherwise it becomes a hassle. And then, it must be possible to charge it easily.

Also, space. Right now the calendar is 7mm think and I think it won’t look as nice on the wall if I make it much thicker.

There are a lot of edge cases to consider. It’s definitely on my wish list but I cut it out for simplicity, for now.