1)
Graduated with a Purdue Engineering Degree, here is my current Indycar Hard card and my 3 rings from my 3 indy500 wins.
2) Great
3) Creating the fillets not only increases strength by removing stress risers but increase surface area (depending on the size of the fillet 25-100%+ more) for adhesion. You are basically making it harder to peal off because you have way more area where the layers are sticking together. Imagine a little dot attaching a layer to something or a solid 1" circle one will be harder to remove. Also the reason why your support material isnt a solid block and done in thin removable layers.
4?)
"I love everyone, but if you are going to hate, I will challenge you by proving me wrong, and he did not accept the challenge. I already strapped a 35lbs weight as a test to make sure it will hold, and it did without any issues..."
Great! I never said it wouldnt work for you. Testing in a single axis it would probably prove pretty strong, if you where to bump it while loaded would it yield? I dont know and I honestly dont have the time or energy to prove out your product. I would worry if it were over MY tank that if I bump it that it would break and fall in the tank. With how expensive XR15's are I would over build it since I personally dont want to buy a replacement.
I dont care what filament you use tbh all I was saying is you could increase the strength and longevity of your design by adding some fillets. Its a nice design that makes it easy to mount on the rail.
Ps I appreciate the petty comments in my build thread, I can tell your not a salty person lol