I modeled this to replace one of the feet on my sectional, screws onto the bottom of the couch base measures 160X160X226 on the bottom and tapers down to 120x120x146.
I recommend high wall count and dense infill to avoid failures. I installed this about 3 months ago and have yet to experience a failure.
I would add some felt pads for convenience
The author marked this model as their own original creation.