Caterpillar Track all parts

This is my version (all from scratch) of a working caterpillar track.
I included one file that contains all parts, and separate stl files for each part.

Parts are as follows:
--the track (printed 100% fill in PLA) has working hinges. Join 3 of these printed track with:
--the track linker (100% fill, also 3) which should stay in place due to the little notch.
--the drivewheel fits tightly with the track and can be printed with 25% fill (2x).
--the axis (2x) should be 100% fill and
--the axis nuts (4x) should be 100% fill too.
--the crossbar (2x) can be 25% fill too.
Of course you can print more tracks and links for a longer caterpillar; do not forget to increase the length of the crossbar in that case.

Mine runs really smooth (after some breaking-in).
I printed it with the Ultimaker original, using heated plate.

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/4k2hkPyAzUG