diff --git a/notes/3D printing/Filament.md b/notes/3D printing/Filament.md
index 98712d9..9ecbbf8 100644
--- a/notes/3D printing/Filament.md	
+++ b/notes/3D printing/Filament.md	
@@ -188,3 +188,30 @@ TPE enhanced with the same chemicals used to make ABS.
 | Pros                                                       | Cons                                                                                                                                    |
 | ---------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------- |
 | - Prints much better than TPE<br>- Very flexible and tough | - Very hygroscopic<br>- Styrene fumes released during printing<br>- Softens at a very low temp<br>- Still requires some level of tuning |
+# PP (Polypropylene)
+- Very bendable
+- Very rugged
+- Perfect layer adhesion
+- Very low density
+- Horrible bed adhesion
+- High warping
+- Supports are impossible to remove
+## Variants
+### PP-GF (Glass-filled PP)
+- Standard for industrial machinery
+- More difficult to print than regular PP
+- One of the toughest, most durable filaments
+- Very lightweight
+# OBC (Olefin Block Copolymer)
+- Fairly new for 3D printing
+- Attempts to combine the good qualities of PP and PET-G
+- Very low bed adhesion
+- Very expensive
+- Typically requires printing on a purpose made printer
+
+# HDPE (High Density Polyethylene)
+- Most bottles and jugs use this filament
+- Horrible to print in every way
+- Useful for purging the nozzle when switching between high and low temp filaments
+
+# POM (Polyoxylmetn)
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