I make them from a single block of sapele. They give the exact time every 5 minutes with “ish” appended for the 2 minutes before and after the exact time. Time is set via wifi.
I’ve been making various wordclocks as gifts for a few years. I also made a simplified design that I donated to my local makerspace for a workshop I used to teach there (we used all their cool tools to make the parts then students soldered and assembled their own unit. I provided the design and it’s program).
This sapele version is (imho) a pretty refined design and the first one for sale. So far I’ve sold 4.
I also cut 3 magic marker holders for an order I got on my Etsy shop (http://www.etsy.com/finewordclocks). That’s my side project to my side project.