The question: "While taking pictures of electron density maps off the screen it would be convinient to display the bonds and electron density mesh with a much thicker line. Is there an easy way to make the bonds and the electron density mesh thicker ?"

 bonds -> use sticks (sketch_setup stick to define their thickness)
 maps  -> draw them twice (give the objects different names)

Markku Saarinen added: Try drawing the map twice or three times. The lines become brighter, or darker, depending on what colour You use for the map.

Venkatesh Murthy continued: You can also sketch_stick to make your bonds really thick.