Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3948579.

I liked the design from Phydam, but I wanted something that didn't require mechanical attachment to the Lack. This remix allows the Lack to sit on the leveling feet. I also used a coarser thread (M33x3) for good results printing at 0.2 mm layer height.

Updates: 2020-01-30: Added foot model that is optimized for TPU. Made overhangs less steep and chamfered inner bottom edge to make it a little more squishy. Backwards compatible with existing extension.