that does not change the fact that no discrete mechanical switch has been designed with rubber components.
What about SKCM damped alps, does that count?
Good point. They have two rubber inserts each.
Also the new MX "Silent" switches. Same principal as the Alps damped. If they brought out "Silent" Clears in RGB cases and 62g springs I may be tempted to try those... The new "white" linear is finally using a different spring to both Reds and Blacks, right in the "goldilocks" zone for MX switches (from the charts shown it looks like 62 to 65g), so there is actually some hope of this eventually happening. With new molds for both case and slider they have a chance of being a lot smoother than current batches of MX, too.
1mm is too thin on stock MX tactile and linears to have much effect, since there'll only be around 0.2mm of movement after contact. This will probably not be enough to resist much force and so you'll still bottom-out the switch (slider flat parts will hit the bottom case).
I haven't measured it yet, but the gap on Zealios is around 0.3mm smaller, so 1mm may work fine with them. I've been playing around with oring pieces slightly thicker than that, maybe 1.2mm and I like the feel. I use about 1.5mm on Clears.
I tried IMSTO balls cut in half, but they're a bit too thin. They make contact, but don't provide enough resistance as they deform.
@Paul, nice to see someone else come up with the same idea
I don't bother gluing my pieces as they have no way to escape the hole and stay oriented just fine. It's hard to cut orings to exact length as they're curved, so it's nice to know of other materials that can be used. Hole punched rubber sheets, balls from IMSTO, cut orings and now... flexible 3D printer filament
Looks like nice stuff for creating custom protective casings for gadgets.