K40 Laser calibration tool 2

I decided to build the [K40 Laser Calibration Tool](https://www.thingiverse.com/thing:2446232) to rough-in the alignment of my CO2 Laser after replacing all of the mirrors and optics, but the little red lasers I got were 6mm instead of 7mm. So I threw together a rework, using OpenSCAD, so that I could customize the laser diameter and make it a press fit.

I'm sharing it here in case anyone wants the OpenSCAD file to do further customizations without having to start from scratch.