Greetings All -
Thanks so much. I learned a lot on this one. And it was just a fun, no expectation, kind of creative exercise.
And I didn’t quench it. Just a Will Stelter joke. 
Which reminds me, it occurred to me that not only did George Foreman help me with this project, but so did Dwayne Johnson.
FYI - the sample of each was 162 grams of HDPE and 117 grams of PLA. Note the greenish teal color on the surface of the HDPE. It only touched the copperish colored grilling mat that I heated it in. And I used a separate one for the PLA. So ya, must have been some copper rubbing into it when I was smashing it. 
Also, I forgot to include a pic of the 3d file it anyone is interested.
I do have quite a number of testing and extra Yellow and Magenta reflector blocks and grid mounts left over from the Fire Box project.
So ya, I’m on it.
HL