Doblo-lugo benchmarks

Two Duplo-compatible and two Lego-compatible bricks that can be used for benchmarking:
* 3D filament printers
* slicers
* your skills

This benchmark is much tougher than it looks. In essence it will test:
* 1st layer printing (if that fails, the rest may too)
* Roofs with pillars. That is a big challenge for high-resolution filament printers. So far, I didn't see any picture of any printer/slicer profile that can do this correctly.
* Stringing
* Warping and over night printing (the big