Use the ice formation on the outside of the recovery spool to monitor how much liquid butane is left while you're recovering , you can find the ideal amount to still get a good pour. they also make something they call the shatter platter that is a removable bottom plate to make less spool to pour out through.
I assumed there were more zeros involved in the amount you were going to be scraping when I made the workflow remark.
I have the viewing port on my collection chamber so I can get a good idea how much is left. And I have my recovery almost completely submerged so I can't see any ice build up on it.
What exactly is a spool?
And yeah this is only my second run thru this thing. I have probabaly a couple hundred 5# runs left to do and that's not including any of my neighbors