THIS ^^^^ 100%!
you can boil water in a paper cup over an open flame…
do you understand the implications?
if you’ve got (eg) water in there, the temp is 100C. no matter how hot it is on the other side of the paper.
doesn’t matter what you MANTLE temperature is. it is the temperature of what you’re BOILING in your flask.
without vacuum, THC boils in the range of 420C.
see what happens if you’re not sucking hard enough (you’ve got leaks)?!?
You are NOT going to hit your boiling point (reduce it to whatever temp you’re stopping at and giving up).
so your THC WILL NOT BOIL. which make it really hard to get it into the condensor…
if your mantle is LYING TO YOU about the temp, you also won’t hit your boiling point.