New deeper body, with less filament needed

[martinwoodward]

Hey folks - just a heads up that I updated the black_outer model so that it's deeper but takes less filament than before to print.

This is to enable a wider array of electronics to be used as the controller inside your octolamp. There is now a 11mm deep recess under the white reflector.

Hope that you find this helpful. Let me know if you've other tweaks that would make the more flexible / better for you.