Bill Schwab wrote:

How do you recommend storing the collets? They are in a plastic box,
relying on lack of movement to avoid collisions. Can I safely make a
wood rack, or is that asking for rust?

I don't have long-term experience, but I picked up a little plastic
storage box at Harbor Freight a while back. It comes with a dozen or so
little cylindrical plastic boxes inside that happen to fit ER32 collets
very nicely. No rattling around.

Pete