diff --git a/scad/jk_rails.scad b/scad/jk_rails.scad
index bfd9154..9f100ac 100644
--- a/scad/jk_rails.scad
+++ b/scad/jk_rails.scad
@@ -1,6 +1,6 @@
 include <./common.scad>;
 
-RAIL_SPACING = 100;
+RAIL_SPACING = 160;
 RAIL_H = 70;
 RAIL_LEN = 400;
 RAIL_D=25.4;
diff --git a/scripts/common.sh b/scripts/common.sh
index b4b3256..af75697 100644
--- a/scripts/common.sh
+++ b/scripts/common.sh
@@ -13,5 +13,5 @@ allParts () {
 
 parallelParts () {
 	PARTS=($(listParts "scad/${1}.scad"))
-	parallel --use-cpus-instead-of-cores bash ./scripts/openscadPart.sh "${1}.scad" "{}" "${1}_{}.stl" ::: "${PARTS[@]}"
+	parallel --use-cpus-instead-of-cores -j -1 bash ./scripts/openscadPart.sh "${1}.scad" "{}" "${1}_{}.stl" ::: "${PARTS[@]}"
 }
\ No newline at end of file