Many/most people won't find this necessary. Since it's a speed game, I decided to use premium sleeves (Mayday Chimera, Premium) which bulked up the stack to the point that they didn't fit neatly in the included cardboard insert. I also wanted to keep the challenge cards separated and protect the sand timers better -- keep them from bumping around in the box.

The photos don't show the spacer -- I turned it upside down like a platform under the timers' piece to raise them up to the top of the box.

This one is designed to be more of an insert and to be left in the box.

Print one of each file.

See my bio for information on printing "chain link fence" bottoms.