This is designed to work with the Peco TT turnouts and the Circuitron Tortoise turnout motor. The revised straight path holder is designed for a 1.2mm rod. Especially improves the operation when the track is at a greater height > approx 20mm from the turnout motor. The hole for the rod should be made as large as needed to support the throw distance. The four holes for the holding screws are 1.5mm. This was printed and tested using a Prusa MK3s. The 1.5mm holes need to be cleaned up afterwards before use.