Thanks for the ideas everybody. Quick update: I did 2 experiments. 1st way, I packed the base of my cold trap with dry ice, full vac, set the mantle at 20C, then slowly increased to 40. When there was no more vapor rising, I stopped the run and dumped the contents of the cold trap in to a pitcher to allow the dry ice to sublimate. What was left in the bottom was terps. It smells like the strain it came from, but not fresh. I think I may have picked up some contaminates from the vac hose or the dry ice. I wouldn’t do this method again. The 2nd method, which I’m really happy with, was to allow the oil to get to 15C (so the stir bar will move freely), then turn on the vac. I had the condenser set at 30C hoping the vapor wouldn’t leave the condenser and get sucked out. I slowly raised the mantle temp to 45C, cut the vac, and was able to collect the terps from the heads flask.