start another Elegoo print run

Makefile

@@ -66,6 +66,28 @@ SLIC3R_FLAGS=\
 	--skirts 3
 # --brim-width 10  #< combine with raft, if first layer fails to adhere well
 
+# settings for Elegoo 3d printer, Siraya Tech Tenacious Flexible Resin (Shore 65D):
+# - <https://siraya.tech/products/tenacious-resin-flexible-resin>
+# 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.
+#
+# other resins:
+# - Elegoo Standard Resin: prints excellent with default settings; zero flexibility, and BRITTLE.
+# - SUNLU High Toughness Resin: prints excellent with default settings on ACF film; not flexible enough to accomodate the phone.
+# N.B. we rotate the model 90-degrees when slicing else it doesn't fit within print bounds.
+MSLICER_FLAGS=\
+	--rotation 0,0,90 \
+	--first-layers 5 \
+	--transition-layers 5 \
+	--lift-distance 3 \
+	--lift-speed 45 \
+	--retract-speed 240 \
+	--first-lift-distance 3 \
+	--first-lift-speed 45 \
+	--first-retract-speed 240
+
+
 all: build/case.stl build/case.gcode build/case.sl1 build/case.ctb build/case.goo
 
 install:
@@ -117,9 +139,8 @@ build/case.stl: main.py src/*.py
 
 # .goo: for Gen 4+ Elegoo printers (requires `mslicer` package)
 %.goo: %.stl
-	# N.B. we rotate the model 90-degrees when slicing else it doesn't fit within print bounds.
 	# XXX: slicer's --rotation argument is radians; it may change to degrees in the future.
-	slicer --mesh $< --rotation 0,0,1.570796 $@
+	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