diff --git a/tech/3D_printing.wiki b/tech/3D_printing.wiki
index f10b97e..96d5081 100644
--- a/tech/3D_printing.wiki
+++ b/tech/3D_printing.wiki
@@ -2,5 +2,20 @@
 
 3D printers can make stuff from raw spools of plastic
 
+== Software ==
+
+=== Slicers ===
+
+* [[Slic3r]]
+
+=== Modeling ===
+
+* [[openscad]]
+
+== Fillaments ==
+
+* PLA
+* ABS
+* TPU
 
 [[index]]
diff --git a/tech/PLA.wiki b/tech/PLA.wiki
new file mode 100644
index 0000000..60c0de2
--- /dev/null
+++ b/tech/PLA.wiki
@@ -0,0 +1,21 @@
+= PLA =
+
+A common 3d printer plastic based on sugarcane.
+
+== Settings ==
+
+My settings I use on my Ender 3
+
+* User a skirt, 3 loops ideally. Good for purging nozzle
+* Speeds
+  * 50mm/s on perimiters
+  * 60mm/s on infill
+  * 60mm/s on bridges
+  * 130mm/s on non print moves
+  * 30mm/s on first layer
+* Temps
+  * ~225C Extruder, adjust to PLA or PLA+ per roll
+  * 60C Bed, constant across all PLA types
+* Fans
+  * 100% fan speed when bridging
+  * Min 35% fan speed
diff --git a/tech/RSA.wiki b/tech/RSA.wiki
index 9a9f8f3..3b251f5 100644
--- a/tech/RSA.wiki
+++ b/tech/RSA.wiki
@@ -3,7 +3,7 @@
 RSA is an asymetric encryption algorithm based on the difficulty of factoring
 large prime numbers.
 
-== algoirthm ==
+== algorithm ==
 
 1) choose some `p` and `q`
    * where `p` and `q` are very large primes
diff --git a/tech/Slic3r.wiki b/tech/Slic3r.wiki
new file mode 100644
index 0000000..8b4be10
--- /dev/null
+++ b/tech/Slic3r.wiki
@@ -0,0 +1,10 @@
+= Slic3r =
+
+Slic3r is a slicer application, generating [[gcode]] understood by 3D printers
+from `.stl` files.
+
+== Settings ==
+
+* See [[PLA]]
+
+== Purge routine ==