LEGO Compatible Block Letters

From a larger project I'm working on, which is a wind-powered decoration for my mailbox.
The letters fit very snugly onto a standard technic axle. For the most part, print with the axle hole lined up vertically, but there are a few that benefit from being tilted a little, like the E.
They don't need too much support.

The letters are 5.5 cm tall, 1.25 cm thick, and 3 cm wide (on average)