This is one link of the Lego (R) caterpillar-track (or tank track).
I did my best to take the measures...
EDIT: If you´re looking for the extra wide verison: https://www.thingiverse.com/thing:6579904
EDIT Sept 5th 2019:
The new V7 Version has a flat surface at the top of the bolt, so that the links slide into each other in a 90° angle easily. I also modified the underside, making printing a lot easier. You´ll only need two supports as shown in the picture (in fact, I even printed it without supports at all, but had to cut away two tiny parts with a knife...)
V1 is the original model including the clip-mechanism, that tends to break easily, when printed with FDM Printers.
lego_Panzerkette_V2.stp | 301.9KB | |
lego_Panzerkette_V7.stl | 297.2KB | |
Lego_tank-track_V1.stl | 259.9KB | |
Lego_tank-track_V2_glue.stl | 343.2KB | |
Lego_tank-track_V2_hotpress.stl | 352.4KB |