Parametric 5V mechanical relay case

I need a case for my relay as it's never a good idea to leave main power exposed. Fortunately, PLA is just as good any as other plastic for this purpose.
Zerkin design was by far the most compact so I used it and modify a few things to make it easier to use and compatible with Thingiverse's customizer.


Change log (compared to the original by Zerkin):
- Making it easier to customize using Customizer by
+ Eliminate coordinate based variables (substituted by width, length, distance...)
+ Increase number of calculated values
+ Reduce number of manually defined variables
- Added 4 cyclinders to the top piece to keep relay board in place.
- Added ability to choose which part is generated.
- Fix error with the top right standoff (One of the standoff's position was defined with hard-coded value).
- Larger text. With the original setting the text was barely printable and was hard to read.