diff --git a/notes/3D printing/Filament.md b/notes/3D printing/Filament.md
index 3eaddc6..9caeff6 100644
--- a/notes/3D printing/Filament.md	
+++ b/notes/3D printing/Filament.md	
@@ -257,4 +257,10 @@ Same building blocks as PEEK, in different levels
 - Mechanical properties similar to PA6 nylon
 - Very high glass transition temperature (187C)
 
+# Additive Superpolymers
+As a general rule, these (CF-PEEK, et cetera), are all extremely difficult to print and put a ton of strain on the printer. They *do* warp less than the vanilla counterparts.
 
+# PEI (Polyetherimide)
+- Used to coat print beds
+- Sold in two grades, 1010 and 9085 (9085 is horrible and shouldn't be used)
+- 
\ No newline at end of file