Taulman Unique Materials
Taulman 3D has a list of quite a few unique materials for 3D printing that I love to use. The Nylon 910 Alloy was used for the 3D Printed Planetary Gear Wheels video, and I have used many of their other filaments in my 3D printing history. Definitely top notch materials.
I also used the PCTPE in my flexible filament comparison video: https://www.youtube.com/watch?v=MXoiqWxPuwM
***NOTE*** Make sure to keep all materials in a dehumidified area or container. No commission is made on these sales – I just really like their stuff!