Here's the explaination of what I'm talking about (read the "Seecret Friday 1"): http://minecraft.gamepedia.com/Minecart#history
**[IMPORTANT]** Read also the comment below, please.
[IMPORTANT] I made 5 mini versions due to a little mistake in DragonmasterDX's mini minecart design so if you want to print the mini one read this before printing one of them:
1st and 2nd mini designs: this is how the design should be, but probably it can't fit in DragonmasterDX's mini minecart
3rd and 4th mini designs: This is a bit smaller than the 1st and 2nd mini designs so it probably can fit in DragonmasterDX's mini minecart
5th mini design (I think that this is the best option): it's a minecart with the inside already sticked in it, so that you don't need to worry thinking if the other ones can fit in DragonmasterDX's mini minecart, just print this one
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I'm sorry for the really bad quality inage, but it's the only one that I found... :\ (found it on Gamepedia, link on top)
Click on the papercraft design image.
Make sure it has not been resized by your browser (you might need to click the image again).
Print using your browser's Print function.