APPENDIX B ■ APPENDIX BAs a 3D model becomes more complicated, you need to be decisive of the order in which shapes
are added or removed. For example, if you want the screw hole to appear both on top of the standoff and
beneath the base, then the screw hole cylinder needs to be subtracted at the very end of the order
(see Figure B-22). Otherwise, the cone (for the taper) or the rectangular cube (for the base) will cover up the
bottom hole.
Cover
The robot is completed with an opaque front baffle and a semi-transparent cover with mounting holes for
switches. See Figure B-23.
Figure B-21. Rounded, tapered, raised, and relieved areas are professional touches
Figure B-22. The order in which shapes are combined in the model is important. Left: Adding the cone and
rectangle at the end fills in half the screw hole. Right: Subtracting the hole cylinder at the end produces a screw
hole throughout
Figure B-23. A black ABS baffle for the front sensors and a PET plastic case to cover the board