Hi Involute, so I pushed it back this far (as seen from the Top view), so that it wouldn't leave any really tiny piece sticking out. That's a distance of about 0.0219 units:
3DM file is attached. The process of pushing it back doesn't take long but there are a few tricks to do it quickly - I first drew in a line in the top view for the new end position. Then I selected the top face and 3 side wall faces and use boolean difference to cut them. You can do a boolean with face sub-objects selected and that causes the boolean to only cut those selected faces ignoring all others. That cut the object up as needed and left some excess faces to be deleted. Then to cut the new vertical wall I had to extract out the large grounding face below it and do an "untrim" on it (select all of its edges by selecting 1 and doing Ctrl+A for select all then using delete), then I trimmed the new vertical wall with that, joined the vertical wall to the others, and then retrimmed the ground against all naked edges then rejoined, repeat that for each side. Let me know if you want more details on this.
The new face is 0.0278 units wide, hopefully it's enough since it is a corner type area and expands from there, not exactly a wall thickness.
- Michael
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