Today’s handcraft topic is “sewing ruler for iron".
This ruler is useful for folding fabric with iron.
This ruler is made from cardboard (heat-resistant).
It is easy to make this ruler. Cut a cardboard to desired size with scissors.
Cardboard with grid, still better.
If you cannot prepare the grid-cardboard, rule lines on plain cardboard.
This tool is handy for folding a fabric in three.
Making movie is the following.