I've found a piece of 1 1/2" stainless steel pipe, sch 20...12" long, with stainless and coffee filters on one end works very well for this application. Use a #7 rubber bung, drilled to fit a 7/64" piece of tubing that the butane adapter goes in for the top end.
I'm doing some work trying to re-extract the active compounds from the waxes/budder to try and make a less expansive potent concentrate. I do this in a separatory funnel, takes multiple washes to get the compounds out and the solvent to come out clear. Lots of waxes remain. The remaining solution is a dark red color (indica was used), that is being reduced to pure oil. I'm curious if any members here have tried this.