Your desk... it's missing something. What could it be? Umm... I know! A catapult, of course! Print individually or all at once, assemble and start hurling objects all around the place. Fun times.
All four pieces should be printed as-is - no support necessary. Each part is oriented such that when printed, the alignment of filament allows it to withstand a greater amount of use without wearing out.
Here's some ammo that fits the scoop perfectly:
Here's the instructions for assembly:
I drew a lot of my inspiration from this single-print catapult design:
Or, better yet, please feel free to dump a bitcoin or two here:
... include a note to the effect of "Hi 3E8, thanks for the desktop catapult thing... my life is infinitely better on account of it and please accept this paltry amount in gratitude".
You're welcome! (in advance) :D
Also, feel free to peruse my other submissions which are almost as varied as they are many:
November 11th, 2016 update: Added a file that combines all four pieces into one single print. Feeling lucky? Go for it!