Long time no post.  Been busy upgrading from Teensy 3.2 to a Teensy 4.0.  The 4.0 tries to be pin compatible with the 3.2 and so far everything has worked electrically.  It took a while for all the c libraries used to catch up.  The work was worth it.  The Teensy 4.0 is like a buzz-saw in comparison.  

I've been finding out about the strength limits of 3D printed PLA parts.  I have tried mounting the vertical array and broke the connectors for the bike rack.  Back to the drawing board.