Yes, you heard that right. We're not just goofy off the fumes, either - using hairspray on your heatbed in place of PET tape and/or acetone solutions actually works. More than that, it works well! In the tests that we've run at LulzBot HQ, we're seeing that the filament sticks better and the printed object pops off the glass more easily when it's finished. In fact, you won't even have to use the knife to pry it off. So how is it done?
First, make sure you've purchased the strongest hairspray available. These are usually identified on the label with numbers or words like Extra, Mega, or Extreme Hold. You can find them at your local grocery or big box store, usually for under $5. Of course, you can always just dig out a can from your bathroom cabinet.. Hey, it's cool. The Eighties were a good time.
Once you've got it home, remove the glass bed from your printer (you don't want the hairspray to gum up the machinery) and flip it over to reveal the side that does not have PET tape adhered to it. Holding the can about 8-10 inches away, apply a light, even layer to the glass. Repeat this 2-3 times and give the hairspray a chance to set before replacing the glass bed. If there is any excess product, it can be easily cleaned up with a dry cloth. (If you are sensitive or averse to perfume, make sure you pick out an unscented hairspray; otherwise, the fumes can get very powerful very fast).
Carefully replace the bed, spray side up, and start printing as you normally would. Voila! Drop us a line and let us know how your experiment worked - we'd love to hear about your experiences.