So one of the things that I absolutely hate about designing for FTC is creating the Tetrix hole pattern-- because I design all my parts in Creo Standard (inches, pounds, etc), and the Tetrix Pattern is in millimeters. As this is annoying to me (funny enough, converting between Imperial and SI is something I don't feel like doing every time I create a hole pattern), I created a UDF for the Tetrix hole pattern.
It takes an input for a surface and axis for a center hole, and axes for the hole circle.
Hopefully someone else can find it useful!
Here's a Google Drive download.