Improve build process and rebuild with images

build.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+mkdir -p stl
+mkdir -p img
+
 SCAD="./takeup.scad"
 PARTS=(
 	"slip_coupling"
@@ -11,7 +14,9 @@ PARTS=(
 for part in "${PARTS[@]}"
 do
    stl="./stl/takeup_${part}.stl"
+   png="./img/takeup_${part}.png"
    openscad -o "${stl}" -D "PART=\"${part}\";" "${SCAD}"
+   openscad -o "${png}" -D "PART=\"${part}\";" --imgsize=1024,1024 --colorscheme=DeepOcean "${SCAD}"
 done
 
 openscad --preview -o debug.png -D "PART=\"preview\";" "${SCAD}"