Single-string Soap Cutter from Scratch

This cutter can split a large block of soap into long logs.
I use a unique and simple string attachment technology. This technology has a great advantage:
In models from other manufacturers, every time you change the height, a bend appears on the string, which can leave a mark on your soap.
There is no such bend in my technology.

The string is adjustable in height from 5 to 11 cm (in increments of 5 mm).
The cutter is made of laminated plywood. It does not absorb moisture and oils.
The distance between the walls 13 cm.
Size of your soap: any length and height, width 12,8 cm
Under the cutter there is a special stop and silicone legs to prevent it from moving on the table.
It is possible to manufacture individual sizes.