Just make sure the green tabs are glued on the blue bars
P.S. sorry noah_bot didn't know your design was on the site though I'm giving credit to you anyways.
Original: http://pixelpapercraft.com/papercraft/53fe1de1e706b30e3d000067/advanced-mini-creeper
How to Print?
1.Click on the papercraft design image.
2.Make sure it has not been resized by your browser (you might need to click the image again).
3.Print using your browser's Print function.