I updated my 1911 checkering jig.

The new jig is larger and has a wider guide area. I have also added a jig to help with the vertical lines too.

Print this to be sturdy. 4 perimeters, 3-4 layers top and bottom, 30% fill or more.

The STL files are oriented for the best 1911 fitting print. The horizontal jig will need supports to hold the shelf up, but they are very easy to remove.

You may have to do some light filing to fine tune the fit, but you should not have to strongly force or strike the jig to get it on, but a snug fit helps.