The design done by Heerozh was good for what I needed; however, my glue gun is thinner than what the actual holder designed in the model, so the gun was swinging all over the place.
I made a small modification where I added 2 pieces of TPU 95 to the side of the holder to hold the gun in place, will it turned out to be the best upgrade possible for this gun stand/holder. Now I can just lay the gun down (I don’t even have to push it in) and it will hold in place. It will always be held perfectly and most important more safely.
The original design holder ID spacing is 40mm wide, the glue gun I have is 29mm wide, each piece of the TPU is about 6mm think, that made thing just tight enough to hold the gun in place.
And as a side note, I printed the stand using ABS, I think using filaments with higher resistance to heat properties is the safer choose in this application. PETG, ABS, ASA or even Nylon will do but I’ll advise against using PLA