Spanner Rack

A parametric spanner holder with most attributes customizable. The width and height of 'rails' are determined from the smallest and largest spanner widths and heights.
I've uploaded 2 pre-configured STL files for a 9-spanner and an 11-spanner version that I created to suit 2 sets of my spanners.
v1.4 - Moved the detail/version text block as it was confusing the Customizer
  v1.3 - Corrected a small error in the rail spacing
  v1.2 - Modified angle limits to allow the slots to be inclined in either direction
  v1.1 - I've added a factor to increase large slot height from base
  v1.0 - Original design