added carriage dxf

CAT0040/README.md

@@ -13,9 +13,12 @@ Plastic is not the first place engineers usually go when designing this kind of
 ### 3d-print
 
 ### laser cut
+Watch out for kurf offset parameters
+That affects how tightly everything fits together. Currently set to (0.1mm per edge)
 
   - carriage
     - Side plates x2
+      - 12 mins each
     - side L supports x2
       - each 8 mins
     - Bottom face x1

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