With the 2nd prototype in hand, it was obvious that gluing the halves together would be challenging.  So wider lands were drawn and changed to captive nuts rather than threading the plastic for mounting the driver.  That was a left handed bit.  So after the mods, am printing a right handed side.  They'll marry up well enough for a test while the printer is busy.

In other news, the Fiancee noticed what I've been getting up to and wants them for her desk.  Hopefully I'll get to enjoy them a little before they're whisked away...