The two rubber pads under the Z-axis lead screws seem to keep shearing off the base of my A1 and shifting out of place. I originally noticed this when the entire printer base sounded like it was rotating enough during a print to hit the surface its resting on. This first happened a while back, so I just flipped the base over and just moved the pads back into place, which seemed to solve the problem for a while.
Today I heard the base was hitting the surface of my table again and saw that the left-side pad was completely pushed out from under the base and the right-side pad was misaligned.
Seems like an issue with the adhesive used on the pads. Is this a known problem? Could I just super glue these pads in place?
It sounds like your printer is moving more than it should during printing.
When I had my A1 (before recall), I had one job on it (big and long) that caused the entire printer to move towards the front edge of the desk upon which it sat. I had to gently move it back during the multi-day print, waking every few hours to deal with the movement for fear it would fall off the desk.
Your desk looks shiny, this may mean you are experiencing some shifts, even if it appears to return to where it started. Whatever is causing it, motion is how the pads are detaching
I suggest you design something (or search for something) that fixes around the uprights and locks into the back of the desk and probably to the wall.
This way the printer cannot slide on the desk and it will be locked into place.
You are looking at a c-shape to lock around the base of the uprights with a bar coming out of the top aimed towards the back of the desk and wall, at that point a block that site between the wall and the desk.
Mock-up visual. (on the left side of the printer, reverse for the right side)
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Probably not what you expected but there is a cheat for that…
Two actually…
If you check you favourite online selling platforms for ‘rubber feet 3M’ and maybe with one or two more search terms you can find rubber feet that won’t come off.
If yours are still ok just look for 3M VHB tape - Very High Bond.
That stuff won’t let go…
The other cheat involves non slip mats - I love them…
You can warp them around things and just use a string to secure them.
If careful and quick you can glue the stuff with spray on contact glue - try a few times first as it eats the rubber away until it gets tacky.
Looks like these rubber feet have a pin to hold them in place.
I would just print a wide set of feet to match and warp two or three layers of non slip mat around them.
Costs next to nothing and is a quick to try 
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The printer is on an Ikea Bror workbench. It’s an unfinished plywood sheet on top.
The printer doesn’t seem to have been shifting at all after ~500 hours of print time. It’s interesting that the bottom pads could push their way out from under the printer base, specifically under the Z-axis vertical rails. I’m honestly interested in whether anyone else has seen this before.
I may just try gluing the pads in place first, but designing a custom retaining bracket for the printer could be a cool project if this keeps happening.
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That surface looks shiny in the photo, amazing you say unfinished.
Just keep in mind, the pads separated from the base, unless there was friction (motion), this wouldn’t happen even if the glue failed on the feet as without motion, you wouldn’t have seen or heard it.
That motion could be micro movement back and forth with little or no obvious movement that I experienced.
