Marklin M-Rail spacer

My first design pretty basic but was something I think would come in handy when building the new Marklin M-Track layout.This is a spacer for M-Track rails in a default width of 77,4mm. It is very basic, but does the job both on straight and curved rail (tested 5100, 5120 and 5200). Newer version has been created: https://makerworld.com/en/models/1673517-marklin-m-rail-spacers-77-4mm-and-96-4mm-v2#profileId-1772190