This V block is a work in progress, I'm not sure yet where it's going, if anywhere!
The idea was that it could be used as a conventional V block and sort of a mini mitre box too.
There are straight saw slots in the V sections, but no straight saw slot in the flat section.
I've hollowed out the V sections to save filament, but this will need support when printing the top V part so check before printing. (in cura this is "Support type-Everywhere)