Gordon form the five ninjas used to be on here very regularly, although he hasn’t been seen since April apparently.
I can only assume that the hardware side of Slice has sort of slipped into non-activity.
I can’t recall anyone ever offering 3d print files on here.
Although a few of the guys did receive plastic/perspex developer cases, they might be able to help for an alternative?
The other relatively active forum for Slice is on Libreelec with the latest software updates emanating from there.
You may wish to ask/start a thread there to see if anyone has a spare case (from an U/S Slice, might be worth a punt?)
Sorry it may not be the answer you hoped for