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