Sheets of thin acetate cut as have a 1" border when placed over 1, 2 or 3 board configurations should work.
They can be rolled up for storage and just need a little scotch-type tape on the corners to hold the acetate in place.
Also helps to keep overlays from wandering. Learned the tape trick from Sam Belcher (R.I.P., Sam).
They can be rolled up for storage and just need a little scotch-type tape on the corners to hold the acetate in place.
Also helps to keep overlays from wandering. Learned the tape trick from Sam Belcher (R.I.P., Sam).