The problem with rosin being that it's way too much work scraping it off the paper and there's always some left on the paper. Solvent is just so much easier, unless you're crazy enough to screw around with butane, in which case you again make way too much work for yourself to even be worth it. Room temperature liquid solvents are the only real practical way. And for those who say that rosin is better because it's solventless, it's not solventless. The solvent is the terpenes, which are actually more toxic than alcohol or acetone. The oral LD50 for alpha pinene is 3700 mg/kg in rats, limonene 4400. Now for ethanol it's 7060 and acetone 5800.
There will be far more terpene in rosin or any solvent extract than solvent residue and its more toxic. The only way rosin pressing would make sense is if laws won't permit flammable solvents. But then you could use CO2, which actually pulls almost no terps at all. People will say it lacks flavor, but then it also lacks toxicity. Granted nobody could consume enough terpenes to reach the LD50 but I'm simply pointing out the difference in toxicity to acetone or alcohol for the principle of it. Point being that people are way too concerned about solvent residue while ignoring the fact that terps are themselves more toxic.
Good video though. However, YourBrainOnWeed made some videos and found that he got higher yields by pressing normal buds right from the bag than by pressing them into discs first. Either him or another guy, I think it was him. BTW, you know YouTube won't monetize weed videos, right? That's why YWOB stopped making them recently. The videos are good if your goal is just to be helpful though.