i’m currently using one of these open blast co2 devices for terpene extraction and personal research but have yet to attempt direct extraction of thca crystals.
I usually end up extracting wax and lipids when going for cannabinoids so the machine is mostly relegated to personal use terpene extraction and tbh its not really built for it either. I have been able to get my runs controlled enough (by pre-freezing the blast tube) that I am seeing these results straight out of extraction with no post processing:
The above was run around 4-6C and ~1200psi according to the gauges on the device. I’m going to start another thread about modifications but I do have problems with collection temp control and fine level flow control. But I completely agree with @tweedledew, “fine for research purposes” or personal use.