Mechanical Rigidity/Video demo toblerone design
Video demonstration of Toblerone-style frame
This video covers both the Mendel (toblerone on its side) as well as the Kossel (toblerone on its end). Both are basically hopelessly inadequate. Whilst it is hard to rescue the original Mendel itself, variants such as the Mendel90 and MendelFlex provide significant improvements, whilst the Fisher demonstrates, likewise, that the basic Kossel concept can be improved on greatly through the use of panels.