Based on Nikola's stl's I built the Octagonal Prism and rounded the corners.
cw_octagonal pucks and prism.JPG [ 603.49 KiB | Viewed 565 times ]
The top shows the Skewb Mod Octagonal Prism by Steryne (right) and on the left side my Skewb puck.
The bottom shows the 3x3 Mod Octagonal Prism and the 3x3 Puck.
cw_3x3x3_octagonal_prism (with cat).JPG [ 406.25 KiB | Viewed 555 times ]
cw_3x3x3_puck (with cat).JPG [ 431.17 KiB | Viewed 554 times ]