This is a remix of gdrag's excellent Silica gel spool container cap / lid, modified with a large funnel to make filling easier. The funnel is twice the diameter of the container opening so it really helps to keep from spilling those beads! The base of the funnel is gdrag's container cap, so it threads on just like the usual cap.
I printed this in PLA. Print upside-down just like the original cap and it prints easily without supports, no problem to print even at 0.3mm.
Easy remix if you want a smaller funnel, but I like this extra large version as I haven't spilled a single bead since starting to use it.