Inscread plate strap size

Also fix mass printing on all objects

Signed-off-by: Arnaud Morin <arnaud.gfpv@mailops.fr>

standoff.py

@@ -4,12 +4,9 @@
 
 import cadquery as cq
 
-from frame_params import PLATE_GAP
+from frame_params import (ALU_DENSITY, PLATE_GAP)
 
 OD = 3.5                 # round M2 standoff
-ALU_DENSITY = 2.70e-3    # g/mm3, for mass reporting
-PLATE_GAP=16
-
 
 def standoff():
     p = (cq.Workplane("XY")
@@ -39,8 +36,5 @@ show_object(result)
 
 
 if __name__ == "__main__":
-    solid = result.val()
-
-    print("standoff   %.3f g each, %.3f g for four"
-          % (solid.Volume() * ALU_DENSITY,
-             4 * solid.Volume() * ALU_DENSITY))
+    v = result.val().Volume()
+    print("%-12s %.2f g" % ("standoff", v * ALU_DENSITY))