Extended cutomizer model based on the Customizable Cuvette/Vial Rack (http://www.thingiverse.com/thing:25080). Now includes:
1: Rounded corners to mitigate cracking from square corners
2: Material-saving through-holes in between the vial holders
3: Skids to mitigate corner curling
4: Inclined orientation with automatically generated support material
Open in Customizer to generate a rack suited to your purposes!
It is highly recommended to print this at a low (10-20%) infill to avoid wasted material and time.