Update Print Guide.md

Print Guide.md

@@ -6,6 +6,8 @@ The plastic parts are bearing quite some load, so printing them accurately key t
 
 ASA is the preferred filament right now, providing generally better rigidity than ABS, especially when kept under load. I have had good success with Prusament ASA.
 
+CF-ASA is also fine. I did not see significnant delta from plain ASA however.
+
 PC-ABS is an option, drop me a line if you have success with that.
 
 ### Parameters
@@ -14,6 +16,7 @@ Use usual [Voron print settings](https://docs.vorondesign.com/sourcing.html#prin
 
  - 80% infill.
  - Supports on bed plate only.
+ - external layers first, or second if your slicer has it.
  - (optional) Enable ironing.
  - support interface layers: 2
  - support interface spacing: 0.12