Customizible LED strip holder

Designed so that walls are always 2x line width. That way even when printing multiple at the same time it works almost like "Vase mode".

"slicer helper notch" adds a slight notch so that slicer won't try to squeeze in inside wall on the 3-way joint. Despite that, on smaller angles (eg. 30 degrees) cura modifies the joint just so that it can make it thicker 🙃. Enabling "Print Thin Walls" seems to coerce it to follow the design.

This design includes both openscad and cadquery version