(3D printer) CrafterBot: Programmable! (9x6x16)

The CrafterBot is a redstone 3D printer that can build stuff. It is fun to watch, and easy to use.

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How to use: Download! >>>>

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The chest are marked Layers 1-15. The printer will print chest 1 first, then chest 2, all the way to the last chest you have filled.(For example: if I filled chests marked layer 1-7, it would print chest 1, then, below, chest 2, and so on, with chest 7 being the bottom layer.) You can draw in the chests, with wool colors: red, lime green, yellow, light blue, dark blue, brown, white, and black. You can also use glass and glowstone. Draw in the chests, making sure that you fill all of the space. You can use glass to show empty space. Make sure no items are stacking, and there is one item in each slot of each chest you are using. the printer will skip empty chests, but make sure the bottom chest is full! When you are ready, hit print! the printer will do the rest. (it takes 5-10 seconds to start.)
Thanks!
Also, since I made this in a short period of time, there will probably be some bugs, so if you comment, I will do my best to fix them.
:D
Also, Please comment, or just simply give it a diamond if you want. It really helps!

Additional Notes

Info:

• Build volume: 9x6x16
  
• Accepted materials:Wool:[red, lime green, light blue, dark blue, yellow, brown, white, black], glass, glowstone.
  
• Error Catching: Will replace unknown blocks with glass, and alert the user.