Makita track saw rail connector
Fits to Makita rails to connect them to get a longer one.
2 bars from top and bottom keeps rails aligned, and the strip pulls the rails from their hanging holes.
Print 2 of the bars:
Use high wall count (6). First print a 3cm slice and scale for tight fit if necessary.
Print 1 strip:
Place on the rail from the bottom. It should be slightly short and hard to push inside, it will pull the rails together.