miho

A typical Unit has 16 surface sections with both front and back sides making total of 32 surfaces.
In this analysis we will designate surface numbers, 1 thru 16 refering to both front and back surfaces.
This elevation show the types of hinge to be installed in the unit at Folding Level 2 (size of 600mm).

Folding Level 1:
A total length of unit, when flat, is 150mmX16sections=2400mm.
When folded into two the size will be half of 2400 or 1200mm which might be difficult to handle.
Here two types of hinges will be enough, A and C types will satisfy the system.

Folding Level 2:
To make the size of typical Unit compact, we can fold again into half making 1200mm/2=600mm
which will be very compact to handle.
However, by doing so, we will have another type of joint B at surface section 12,13.

Folding Level 3:
In case you want to make the typical Unit compact, you can fold one more time as shown here.
However, by doing so, we will need more types of hinges, D and E.
To avoid this, it is recommended to stay at Folding Level 2 where we have two type A hinge and
one B type hinge, and the rest will be C hinges.