Printing in the air

This is the kind of thing we want to see.....

I found out something kind of interesting today. Turns out that if you print things which are 1 mm above the print surface they don't actually print very well. I'd designed a little plastic lid with mounting pillars and placed them on the base, but i'd left a gap of 1 mm underneath the pillars, so the poor printer tried to print them in the air, with  "hilarious" consequences. 

Thinking about this, it would be great if the design programs displayed shadows because if I'd seen the gap underneath the pillars I could have fixed it straight away.