Single vacuum motor,
with second stage deep vacuum check-valve. I staple the plastic
to a wood frame that fits in a toaster oven. 325 degrees seems to
work well with HDPE, PET plastic (2-liter bottle) seems to shrink too
much to be useful here.
sheet was heated too hot, developed holes, plus I gave it a '"hickie" in the center of the wrench
sheet was heated too hot, developed holes, plus I gave it a '"hickie" in the center of the wrench