I have tried a few other T slot covers that I have found on here but non of them were satisfactory. So I drew one from scratch. This one is designed to flex in the middle, something none of the other ones could do. It will be a tight fit even once snapped into place.
If I get time and there is interest I will make extruded versions for the 400 Ratrig so you can print with one shot all the slot covers you need for the machine. I will upload the fusion file so a little later.
The author hasn't provided the model origin yet.