diff --git a/notes/3D printing/Filament.md b/notes/3D printing/Filament.md
index a093e0f..1c5a882 100644
--- a/notes/3D printing/Filament.md	
+++ b/notes/3D printing/Filament.md	
@@ -110,3 +110,20 @@ Nylon filaments are engineering filaments. They're difficult to print but have e
 - Higher toughness
 - Higher temp resistance
 - Durable but brittle
+### PA-CF (Carbon Fiber Nylon)
+- Very stiff
+- Less warping
+- High friction
+- High end printer required
+
+### PA-GF (Glass Filled Nylon)
+- Used in the real world (handguns, chainsaws)
+- More affordable than PA-CF
+- Much stiffer, tougher, and more resistant to heat and abrasion than vanilla nylon.
+- Greatly reduced warping
+- Fairly easy to print
+- Still requires a high-end printer (tungsten carbide or gemstone nozzle, abrasion resistant drive gears)
+- Durable enough to act as a viable alternative to machined aluminum
+
+### PA-PETG (Nylon PET alloy)
+Often called tough PETG or low temp nylon, PA-PETG is meant to serve as bo
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