explain more about printing the parts, esp. patterns

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

docs/printing-and-materials.md

@@ -8,6 +8,15 @@ My preferred settings are 3 wall loops with 20% gyroid sparse infill. This gives
 strength against bowing forces, but something more default, like 2 wall loops, 15% grid sparse infill, is fine and does
 not lead to a weak enclosure.
 
+### Supports and Positioning
+
+All of the parts are designed to be printed outside-face-down. The bevels are at an angle (45 degrees) that should print
+fine with no supports. Make sure everything is aligned properly on your plate so that the flat face you will look at the
+most is on the bottom.
+
+The only exception to this is the interconnect piece(s), which are not visible and need a support to print. Maybe one
+day I'll rejigger these.
+
 ### Working With Flatness
 
 A lot of the pieces are long and flat, so I recommend really dialing in your printer settings. The frame pieces make
@@ -20,15 +29,36 @@ uniform lines that create reflection patterns on long, flat surfaces. This can b
 panels and their decorative plates, since they're what you're looking at 90% of the time, and the holes break up a
 perfect pattern, making the long lines stand out even more.
 
-* **Top panels:** using a non-uniform pattern reduces if not eliminates the problem of the surface catching the light,
-  but for some patterns, it may come at the expense of time. Other patterns may improve beyond monotonic, but hilbert
-  curve seems to be the gold standard.
-* **Circle-centric decorative plates:** don't use complex patterns like Archimedean chords on decorative plates, as they
-  seem to have issues with filling curves and you still want to try to maximize contact with walls. Concentric is great
-  here if you dial it in.
+Some specific parts are worth some additional notes:
 
-The concentric pattern is a good default and prints awesome parts, with the only exception being the top panels, which
-benefit from using a Hilbert curve initial layer pattern instead of concentric.
+* **Top panels:** using a non-uniform pattern reduces if not eliminates the problem of the surface catching the light,
+  but for some patterns, it may come at the expense of time.
+    * **Avoid:** monotonic.
+    * **Good for the time:** Archimedean chords create the look of a circular ripple radiating out the center, and
+      depending on the material, you may not even notice it much, so it's a pretty good look/speed balance.
+    * **Great if you can wait:** hilbert curve leaves no discernable pattern on most materials, but some high gloss,
+      high contrast materials may show the winding pattern at some angles --- consider Archimedean chords for these.
+* **Circle-centric decorative plates:** simple ones could be fine in whatever, but the ones for action buttons end up
+  having lots of weird interaction points.
+    * **Avoid:** none; monotonic doesn't look *good*, but the plates don't have enough surface area for the pattern to
+      stand out too much.
+    * **Decent:** concentric is generally good, but you can get some pitting when the pattern radiating away from
+      buttons collides with other patterns, because none of the geometry lines up well.
+    * **Great:** Archimedean chords, just crank up the infill/wall overlap to avoid pits on the edges.
+* **Frame walls with Neutrik or aux button cutouts:** a reduced but similar problem with the action button decorative
+  plates, the circles near each other create weird interactions with the walls.
+    * **Avoid:** concentric, again, has problems with pitting where geometries clash.
+    * **Decent:** monotonic is pretty decent here, and you probably won't look at the sides too much, so maybe it
+      doesn't bother you.
+    * **Great:** Archimedean chords again, with the same infill/wall overlap as decorative plates.
+* **Flush frame walls:** you can pretty much do whatever you like here.
+    * **Great:** concentric produces an interesting pattern and you won't have collision problems in a rectangle.
+    * **Essentially great:** Archimedean chords yet again, you may just not like the pattern as much as the end result
+      of concentric.
+
+The Archimedean chord pattern is a good default and prints awesome parts, with the only exception being the top panels,
+which benefit from using a Hilbert curve initial layer pattern instead, though you may be happy enough with Archimedean
+chord.
 
 ## Materials