@SmoknGranny A potato masher sieve??? Not sure what you mean by squeezing out the butter?
Okay, did it in the oven with fresh bud and trim in the jar as well as dried bud and trim. My son was a room away with his door closed, but didnt smell a thing. i smelled it only when I opened the jar after an hour in the oven. Had online folks mention burping the jar but not necessary. That would only increase the smell. The jar is tempered for alot higher temp than a person would be using. Just dont expose it to cold till it cools. I set the jar in my bathroom to cool and had no problem. No noticable smells at all. I used a 1/2 gallon jar so had plenty of room in the jar. Only filled it to about half. After an hour the bud had fallen to about a 1/4 th of the jar. I had it setting on a cookie tray in the oven. Anyway, it works as long as using a canning jar and fresh canning lids. No smell.
So folks can post it where they want here that its been tried and works.
Forgot to mention. Got the crockpot going with the mj and butter and water on low. Now just waiting. Will stir in about 5 to 7 hours. And leaving it 24 hours??? That seems long, but I guess I can since I want to get the strongest butter I can.