I had a thought when soldering this up though: Because the pins for motor A protrude through the board, they need to be filed down and insulated so that they don’t short against the housing of the USB-B connector on the arduino underneath (a blog about it).  This is a pain, and in principle (if not in practice), makes for a weaker connection.  This has never been a problem for building the full kit, because the arduino mega I use has a mini-USB connector, but for everyone else (and all the vitamin kit parts), it’s a glaring issue.

So I think I will swap motor A with motor C, so that by default, for polargraph, that filing doesn’t need to be done.  Will still be wise to put a bit of electrical tape on it because it could still contact, given the right pressure.

Motor C was added because I had the space, and also because I have a few plans for things that might like to have a third axis of control.  The parts for motor C will be unpopulated by default, for Polargraph products anyway.

So, I think I’m immediately going to revise this to swap A and C, but also I might try to move the servo and endstop pins, and add some more lights.  I’ve got all these LEDs to use up!

Another fortnight for v1.5.