diff --git a/Makefile b/Makefile
index 372877f..5223aa1 100644
--- a/Makefile
+++ b/Makefile
@@ -71,6 +71,9 @@ SLIC3R_FLAGS=\
 # runs/data
 # - defaults: print had entire walls, failed. e.g. volume box had no top.
 # - defaults, ACF film: print succeeded, but some walls caved in during print.
+# - Siraya recommended settings, ACF film: print succeeded, but some walls caved in during print.
+#   exposure=3, lift-distance=3, retract-speed=240, lift-speed=45
+# - exposure=5, lift-distance=5, retract-speed=150: excellent print
 #
 # other resins:
 # - Elegoo Standard Resin: prints excellent with default settings; zero flexibility, and BRITTLE.
@@ -78,17 +81,19 @@ SLIC3R_FLAGS=\
 # N.B. we rotate the model 90-degrees when slicing else it doesn't fit within print bounds.
 MSLICER_FLAGS=\
 	--rotation 0,0,90 \
+	--exposure-time 5 \
 	--first-layers 5 \
 	--transition-layers 5 \
-	--lift-distance 3 \
+	--lift-distance 5 \
 	--lift-speed 45 \
-	--retract-speed 240 \
-	--first-lift-distance 3 \
+	--retract-speed 150 \
+	--first-lift-distance 5 \
 	--first-lift-speed 45 \
-	--first-retract-speed 240
+	--first-retract-speed 150
 
 
-all: build/case.stl build/case.gcode build/case.sl1 build/case.ctb build/case.goo
+# all: build/case.stl build/case.gcode build/case.sl1 build/case.ctb build/case.goo build/pinephone_case.png build/pinephone_case_with_phone.png
+all: build/case.stl build/case.gcode build/case.sl1 build/case.goo build/pinephone_case.png build/pinephone_case_with_phone.png
 
 install:
 	mkdir -p $(SHAREDIR)
@@ -139,7 +144,6 @@ build/case.stl: main.py src/*.py
 
 # .goo: for Gen 4+ Elegoo printers (requires `mslicer` package)
 %.goo: %.stl
-	# XXX: slicer's --rotation argument is radians; it may change to degrees in the future.
 	slicer --mesh $< $(MSLICER_FLAGS) $@
 
 readme: readme_files/pinephone_front_case_with_phone.png readme_files/pinephone_back_case_with_phone.png readme_files/pinephone_side_case_with_phone.png
@@ -147,7 +151,7 @@ readme: readme_files/pinephone_front_case_with_phone.png readme_files/pinephone_
 doc: readme build/web-viewer/index.html
 
 clean:
-	rm -rf build
+	rm -rf build/*
 
 upload: build/case.gcode
 	lftp -e "set ssl:verify-certificate false; put $<; exit" -u ${PRINTER_AUTH} ftps://${PRINTER_HOST}