About this 3D model
I loved the Houglasses by user ogreballs (https://www.thingiverse.com/thing:3728621) but I didn't want to have hot glue all over in order to use them (I'm terrible with hot glue). So I added a little cradle built in that the hourglass fits in. The first print I did was a bit tight so I made it a little bit bigger. I just used an hourglass I bought from Dollar Tree.