Why start so small? you’ll want a bigger one after the first successful run…
I certainly understand the wish to destroy as little cannabis as possible while learning, I’m just not certain that starting with a rig you know you’ll outgrow the moment you figure out how to run it makes a lot of sense.
not even certain distillate makes sense these days…see: Liquid diamonds is just distillate, change my mind (we haven’t bothered making distillate in the last year).
assuming you decide it IS worth making distillate, AND you decide you really do want to buy a rig you’re only going to run a dozen times, I submit that the head design is mostly irrelevant, you’re going to go buy a different head and a 2L/5L rig as soon as you can get the little one to work…
only PTFE?
nope. add dope…distillate (or liquid diamonds).
You are aware of the need to make “crude” first?
Not all who purchase SPD are: How to make home Crude oil for distillate