Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4783286.
This listing offers the source file (editable in SketchUp) for my design over here:
https://www.thingiverse.com/thing:4720161/
... titled "Snapmaker 2, Caps for Laser and CNC"
I was going to say "If you're looking for the STL files, they're at the link above" however, Thingiverse won't let me publish without adding STL here, so I have.
Why am I posting here under a different name?
Thingiverse has a serious bug. If you delete a collection without first emptying it, you get locked out of your own account. That happened to me. (My original account was under my personal name. This account is under my design studio name.)
In the comments for the original "thing," the source file was requested. Since I cannot even log into the original account, let alone edit my designs there, I'm posting this here as a workaround.