Step 11: Building Bigger...
If you would like to make a bigger vacuum forming machine, you will need the following:
--One 5 gallon plastic trash can with an approximately 8x12 inch rectangular top.
--One 8x12 inch metal baking pan
--One or two tubes of silicon caulk.
--One 20 ounce coke bottle or similar.
--Two picture frames about 8x10 inches.
Do basically the same thing as above on a larger scale. Drill a grid pattern of small holes in the baking sheet. Cut the bottom off the 20 ounce coke bottle. Cut a hole just large enough for the 20 ounce bottle near the bottom of the trash can. (Now here's where I have had a bit of a problem, you may need to reinforce or brace the inside of the trash can and/or the bottle with some wood or something before you go on, otherwise, it'll collapse under the vacuum some. It hasn't caused too many problems for me, but it could for you.)
Put the 20 ounce bottle in the hole in the trash can and caulk the seal between them pretty strongly to make sure that it is air tight. Then turn the baking sheet up side down and caulk it to the trash can. Let dry, and you are done.