Foot massager

BOM
These items can be sourced on Amazon.com or your local supplier for probably less than McMaster-Carr

Edit 2024-11-12:
Updated ‘Roller’ and ‘Roller - no axle’ for easier printing.  Orient to print on the end, will only need supports on the base, the bumps should print OK without supports.

The no axle version of the roller will print without any supports, although I do recommend a brim to keep it adhered to the bed.

Heat set inserts to better secure the sides to the base.

Also redesigned the spikey rollers, one version with a built-in/printed axel, and one with a hollow core to support a metal axel.