Lego bb0219 - Train track stacking pin
thingiverse
A simple replacement part for the stacking pins originally gotten with RC tracks. These are often thrown away early, only to be remembered as handy later on when storing tracks again. The hole for the pin seems to be made 3.1mm (caliper measurement), and this design allowes for 0.1mm friction (a well tuned PLA printer should do it). NOTE: You do have to be careful with your Z calibration if you're printing this right side up, I've experienced that 0.030 mm already changes results. Also recommended to print 100% infill for sturdiness. Made in Fusion360.
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