Nice job
Poppa . When to stop the extraction. Are you trying to avoid all ethanol in the oil? Then it needs further concentration. If ethanol being present is not a problem then It is up to you. As the ethanol leaves, the oil will become thicker and harder to manipulate. A little bit of ethanol goes a long way to making it easier to use. If you need ethanol free, put your concentrate in a stainless steel measuring cup. Measure and record the tare weight first. Then I use a candle warmer to gently warm the oil. You will be able to smell the ethanol coming off. Continue until vapors are no longer being gassed off. The oil will be very stiff now think cold molasses. Silicone containers and tools help manipulate that.
If you did your extract correctly, there is little left worth fussing over in the leftover plant material. Let it dry and do a smoke test. It may be harsh, but see if it still gives a buzz. I usually do 3 washes of 5 minutes each as cold as the freezer will get it, about 20*F. Make sure there is no ethanol in it before you try and light it up lol.
Did you freeze your ethanol, bud, wash vessel, before extraction? Goal is to keep everything as cold as possible until it is separated from the plant. Did you decarb before extraction? Not sure how you intend to use this.
Why are there 3 filter papers? 3 different filter runs? Don't understand. You should be able to use the one paper in the buchner for all wash filtering during a lab session. I use a stainless kitchen drain strainer to pre strain the ethanol wash before sending to the buchner. Are you pre-wetting the filter paper with solvent before you start the filtration process? Doing this lets the paper relax and stick to the buchner plate.
The crucible is part of your extractor machine I take it. Don't waste that. Wash out with warm ethanol. It will not take much. Save this, put in freezer, then add to your next batch. Just toss it in the buchner and have it part of next batch. If you are particular about mixing strains of extract, then wash as described and start a saved wash jar of ethanol and what ever you washed out. Save it up and when you get enough concentrate it down. Call it mixed bag oil.
It looks like you have not completed your concentrations for all your washes. It will be interesting to see what your ethanol consumption is for the 30.5gm you started with. I'm talking process consumption, not licking the bowl. My process consumes about 150ml. processing a 30gm batch with a 60ml final volume for tincture.
The small jar in picture 3 is what? Did you press the plant material to get that out? If it is the "third wash" there might be something in it worth saving. Are you combining your washes or product of washes or keeping them separate?
I'm not familiar with the machine you are using. What is it? The spattering or popping you refer to is probably what is called bumping. That is when your solvent gets to a temperature higher than the boiling point but does not vaporize. This condition builds up energy until something has to give, then you get a sudden vaporization of solvent that pushes any liquid solvent out of it's way, hence the term bumping. It can cause mayhem in a system like I have. There are procedures to take to prevent bumping in systems like introducing nucleation sites with boiling chips or agitation. This can happen with most volatile organic solvents if precautions are not taken. Don't know if they are able to be applied in your evaporator, not familiar with the machine. I suspect solvent from a new wash might get under or mixed with the thicker oil in the crucible and cause this to happen. If the wash is used to completely dissolve any prior residue in the crucible you should be able to avoid this just like you did when you cleaned it. Clean it with then new wash. Use your own judgement.
Did I help you or confuse you? Feel free to ask more questions.