The dial for my bathroom fan timer broke. It's an older model: a metal post with a slit down the center that results in two “D” shaped pieces. I couldn't find one that would fit (3d printed or at the big box store) so I made my own. Here it is in case you need it too!

In case your post is different than mine, I've included the F360 files for you to make any modifications you need. My apologies in advance - professional modeler I am not.