MyGrid rev 2

After printing about 30 base plates and a bunch of modules, I came to conclusion that the system deserves an update. This is the updated version. Improvements include, 30% print reduction time, 17% material reduction, and larger keys and keyholes with larger drafts, make it easier plug modules into baseboard. Another benefit is that it is easy to snip the locking part with flash-cutter to have a mixed-use base plate. Before I planned to have a separate version without lock (which is still will be available). I will still be uploading modules for rev 1.