One important detail of the loom is reed... (two better than one!)
how to make it?
from "craft sticks" ! (also known as Popsicle sticks)
Step 1: Everyone tryed that
and here it is kind of "working prototype"
But there is Another Way
Step 2: Create Slot
cut one stick into pieces to create "uniform spacers"
and glue them together to create slot
Step 6: Ways to improve it
Or just cards...
or milk carton..
I see it is possible to get 12 DPI easy!