This is an end cap I designed to fill hollow steel tube. The "fins" are 0.78" in diameter. The solid core is 0.7" and the end cap is 1" with a 0.15" round.
I have included the Fusion 360 file so that you can edit the dimensions if you need.
OR you can scale the .stl file up or down in a slider to make it fit your need!
0.1 layer height
This took around 56 minuets to print.
Husband, Hobbyist wood worker, builder, tinkerer of all things.