SWIM seconds Infundiblum but would like to add that it's a good idea to:
-obtain a small container with a lid that will be resistant to warm naphtha vapors
-fill the container with naphtha
-poor that and only that amount in your heating vessel with the freebased extract
-stir the contents well as it heats
-once it reaches the desired heat, transfer the naphtha back to the original container
-freeze precip the contents (usually occurs in a matter of hours)
-decant the naphtha into the heating vessel, leaving the freeze-preciped product in the container.
-repeat all steps until the desired amount is obtained.
Usually when SWIY is about ready to collect and dry the product, SWIY could just add the hot naphtha to the container to dissolve the freeze-preciped product. Then leave the container away from heat, light, or disturbance overnight at room temperature. SWIY'll be able to collect a more solid product this way.
Continue to use the same naphtha and add more as needed since some will evaporate.