document experience with different print settings

Makefile

@@ -2,16 +2,23 @@ PREFIX=/usr
 SHAREDIR=$(PREFIX)/share/models
 PRINT_TEMP=220
 PRINT_BED_TEMP=65
-PRINT_NOZZLE_DIAM=0.4
+PRINT_NOZZLE_DIAM=0.2
 PRINT_FILA_DIAM=1.75
 
 # settings for Bambu p1p 3d printer
-# 50mm/sec w/ raft=2, density 20%: works but causes very rough edges
-# 40mm/sec w/ raft=0, density 20%: fails; infill becomes too sparse
-# 35mm/sec w/ raft=0, density 50%: works, corners are rough
-PRINT_SPEED=25
-PRINT_DENSITY=100
+# 50mm/sec w/ raft=2, 0.4diam (wrong!), density 20%: works but causes very rough edges
+# 40mm/sec w/ raft=0, 0.4diam (wrong!), density 20%: fails; infill becomes too sparse
+# 35mm/sec w/ raft=0, 0.4diam (wrong!), density 50%, honeycomb: works, corners are rough
+# 25mm/sec w/ raft=0, 0.2diam, density 75%, rectilinear: fails; detached from bed
+# 35mm/sec w/ raft=0, 0.2diam, density 75%, rectilinear, first-layer 0.2: works, but takes like 6 hours to print
+# - 2.5mm thickness => needlessly thick; stiff
+# - 160mm length => too short
+# - 3/3.5/6.0mm overhang => too much (that amount of overhang can't be printed reliably)
+# - port cutouts => should extend into more z
+PRINT_SPEED=40
+PRINT_DENSITY=20
 PRINT_RAFT_LAYERS=0
+PRINT_FILL_PATTERN=rectilinear
 # XXX: Slic3r doesn't always set the bed temperature correctly. fix by specifying it also for the first layer.
 SLIC3R_FLAGS=\
 	--temperature $(PRINT_TEMP) \
@@ -24,7 +31,11 @@ SLIC3R_FLAGS=\
 	--first-layer-speed $(PRINT_SPEED) \
 	--infill-speed $(PRINT_SPEED) \
 	--raft-layers $(PRINT_RAFT_LAYERS) \
-	--fill-density $(PRINT_DENSITY)
+	--fill-density $(PRINT_DENSITY) \
+	--fill-pattern $(PRINT_FILL_PATTERN) \
+	--use-firmware-retraction \
+	--first-layer-height 0.2 \
+	--skirts 2
 
 all: build/cases/pp.stl build/cases/pp.gcode