Marble Genius funnel top support

Just looking for something to print so I cooked this up. Fits over the "funnel" piece in the set to support pieces above it. The center is hollow and aligned to drop through the hole in the funnel.
It's a 1-way attachment as the 3 "ears" aren't symmetrically spaced.

Update: 7/6/2019
Found that some marbles were hitting the spoke nearest the entrance. Added an extra 0.5mm clearance for the v10 file.