They look maybe AMS foot size?
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I think these are spare bit of tape for the part cooling fan.
I know that there were some people who had issues with the part cooling fan becoming “unstuck” form the side panel as it just uses double sided tape to mount it. I think these were thrown in as a stop gap measure like: Yeah, you may have a problem so here’s extra tape in case you do.
This is my best guess… I don’t know this for sure.
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I found this image on the wiki about reattaching the fan. These appear to be the same as your picture as well as the little packet of tape that I got too so I’d say it’s pretty much confirmed that these are replacement pads if needed.
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Thanks for the info. The packet has 6 pads in it. The Aux fan housing in my printer has two lugs on the bottom and one on the side with screws which I assume is the revised version.
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I’d keep them anyway. It’s possible the use of that double-sided tape could help dampen any vibration issues you may encounter with the aux fan now being connected to hard points.