Alright, nice!
So, you want to pour the solvent off your crystals (while still freezing cold). If there's loose crystals, you can catch them in a coffee filter. Then let the naphtha warm back up and reuse it for the next pull. Keep pulling until the freezing doesn't yield crystals anymore.
If you already let the naphtha warm to room temp with the crystals still inside, put it back in the freezer for at least 12h first.