After trying another design and breaking the ‘toes’ off of a few feet previously (probably a print issue, admittedly) I decided to utilize Tterbocharged's file for the v400. Now the ball is fully supported around its circumference and they're moved inboard to hopefully provide more support.
Note that this is a new design. The pictured prints were made at a lower resolution than the files provided. This should accommodate the length of the factory hardware but leave a note if you'd like a revision.
Edit Sept ‘23: Added a thicker base as well as a test for the current dimension. If you need to add depth to your feet due to hardware differences you can change this in your slicer. I’ve added test pieces as well. The standard test is for the normal base thickness. The thick base is +5mm, and there is a test piece for +3mm. If the 3mm test works, drop the model 2mm in your slicer, if 3mm is still too short print the thick base as-is.
The author remixed this model.
V400 fitment