Updated to print in less than 2hrs. Cleaned up to handle 8.5x11 sheet of transparency film and a change to the bottom support to accept the thin film. Uses 3 hooks so that a paper hole puncher can be used on the shield transparencies. Also removed all lettering for faster printing.
Total cost to create one including the cost of the transparency film and elastic is under $2CDN
The author remixed this model.
modified for using 8x11 inch overhead sheets