Lego plastic vs carbon fiber vs aluminium vs stainless steel. Lego-compatible axles tested comprehensively. Enjoy!

0:09 Max torque test
4:15 Durability test
5:56 Friction test 1: car and a slope
6:54 Friction test 2: rotating plate
7:51 Noise test
8:44 Insertion test into Lego parts
9:44 Close-up images
10:21 Weight & density comparison
10:53 Price comparison (Nov 2023)
11:14 RESULTS SUMMARY

Carbon fiber axles are made by CaDA Bricks.
https://decadastore.com/produc....ts/cada-carbon-fiber

Aluminium axles are made by Metal Technic Parts a.k.a. Dark Ice Designs. They also make the metal gears and beams that were used in the max torque test bench.
https://metal-technic-parts.com/collections/axles

Stainless steel axles were originally sold by Brick Machine Shop on BrickLink (obsolete), later cncgear on EBay (obsolete), and now planned to be sold by Prototype Production.