My holder stopped holding accessories and they kept falling when vacuuming. I made a copy of the original holder with a bit tighter tolerances to keep the accessories more secured.

Print in PETG/ABS/ASA since it should bend a little when attached to the vacuum. PLA might work but I have not tested.

Updated 2023-09-08: reinforced the connections since I snapped the previous version. I recommend printing with 4 walls.

Source is available on OnShape.