Rather than mounting my extruder to a wall or post, I mounted it to a 2 x 6 pine board cut to a length that works in my basement studio overhead. I have two Harbor Freight ratchet bar clamp/spreaders that I use to temporarily attach the mounting board to my workbench. After use the extruder and board can be stored elsewhere. This allows the option of extruding anywhere the board can be clamped as well.
I was concerned that the pressure from extruding might tend to loosen the clamp, bend the board, or otherwise make the temporary clamping unstable, but it has worked very well with no issues. I mounted the barrel at a height such that I can look into it on tip toes (I am right at 6 feet in height), which has been a good height for extruding a long tube, while still being able to inspect and clean the barrel. I use a Scotch brand combo sponge/scrubby that just fits into the 4-inch nominal barrel to clean the clay out. I reach up into the barrel from below and inspect my cleaning from above, which works well. The only issue I have is that I have to make sure to line the handle up in between floor joists when the barrel is full to allow a full pull on the handle.
Wow, that's a really clever solution. I've been wanting to get an extruder for my classroom, but wallspace is almost non-existent. I was going to have the Industrial Tech guys weld up some kind of metal frame, that I could bolt to a table, but this is a nice alternate solution, especially if I don't want to leave it out all the time.