I have RACQUETBALLS, not squash balls, so I needed feet for that.
Next problem: my Tornado and Ender 3 are SLIGHTLY different with the Ender being a little too tight for the ones that fit the Tornado, ughhh!
Solution: Design 0.2mm smaller rails for the Ender 3 and add a zip tie to secure (sits on it, could only fall when lifted).
OK, and let's add a hole for someone who want to screw under the ball into a drilled hole, and why not add a provision for a T-nut access also? OK, done.
2 versions, one does not have the T-nut access through the "flower petals" that grip the racquetball if you don't intend to use that.
STEP File is included if you need to mod.
PLA is great for this or PETG, ABS, etc
PRINTING TIP: Print one and if the fit is too loose or tight change HORIZONTAL EXPANSION (in Cura) -0.1 to make smaller, +0.1 larger, etc