This is an extension for the tracks (or guide rail) of track saws from Makita (and should work with Festool as well) to get an accurate cut even on the sides when first cutting the splinter guard to size. This one uses the connectors to combine multiple tracks, there are also options that you can screw in, but I didn't want to use them hence this exists.

Print settings

I've used PETG in 0.2mm layers and 15% infill on my Prusa Mini+, that worked well enough.

You only need to support the pin for the second t-slot (see last picture, the blue box is a support enforcer). They get a bit easier to remove if you don't add support for the nose it.

Link to the model: https://cad.onshape.com/documents/e19dc1da8de6e368a1088b44/w/90d90f5f6489bd460651a35b/e/1c2b672cf6fd394107cd1029