Wanted something I could use in my chair to put pressure on a trigger point in my back and gluteus medius . There are some other items available to print, but this has a large base and works in a chair or bed without tipping over.

Printed in PLA with tree supports to hold up the center (Shown in picture after removal). Might print without it but I didn't want to print and have it fail to find out!  

This is 90 mm tall (base to top).  It is pretty tall because I use it against a soft surface generally (bed or computer chair)  Just scale your print to suit your needs.

Edit: Added the *.stl for one printed at 70%, 65mm or so tall