Due to new user limit of 2 links, I'm making non-clickable links for this post, please see original text at http://www.reddit.com/r/3Dprinting/comments/2jhq7z/structur3dio_paste_extruder_contest/clmjo72
I've been thinking of awesome things that can be done with a paste extruder and what kind of materials that can be used, and the best idea that came to my mind was the reproduction of Moroccan carved plaster! As a Moroccan living in Canada, I thought that bridging the gap between the traditional and modern worlds was a great challenge to bring to our 3d printers.
A little bit of background first: In Morocco, there are many plaster craftsmen and a lot of people use carved plaster in their homes, a lot of times it will be a frame around the ceiling, or arcs, but some will have beautiful works of art as part of their homes. Here are a couple of resources about plaster carving (make sure to click on the images in the links to see them in full beauty) :
You can also google "Moroccan carved plaster" and see more beautiful images, such as this one : /http://cdn.c.photoshelter.com/img-get/I0000LlqOYGCrtzQ/s/880/880/morocco-kasbahs-121.jpg or /http://paintthekasbah.files.wordpress.com/2012/05/blancoriad-detail-800x531.jpg
I think mixing the traditional with the modern is a great idea, so I decided to submit to this contest a 3D design for a Moroccan carved plaster column so it can be printed with the Discov3ry using either Plaster (if possible) or spackling paste (drywall).
You will find the required files here : https://www.dropbox.com/sh/b53xpxg548bz0r7/AAAXDNs-GmRTz6vB4q3Npprla
Step 1 : Find an appropriate plaster design. I decided to use this one : /http://www.christinedemerchant.com/files/morcarvedplastercolumnd.jpg
Step 2 : Use the Perspective tool in Gimp to make it rectangular/perpendicular and crop the portion you want to print : /https://dl.dropboxusercontent.com/content_link/LChtuqO07cx1qkdmMeQrKLANNNao7g8MlkV2Y4CnsL1W3tMYirCS0frgDA88ZYj7
Step 3 : auto-white-balance, auto-color adjustment, and a little modification to 'close off' the column : /https://dl.dropboxusercontent.com/content_link/G1y9AEKmYcBGBo9BA5ensrza4BM44jRPnuD8HWomcqjHSJhen1pwiDJNfvZFaqMe
Step 4 : Download Litophanes 3D tool (I used /http://www.imprimindo3d.com.br/software-para-impressao-de-lithophanes/ which works fine (just need to set language to English), there are other tools available but they don't seem to do the trick for this kind of task), and load the image into it.
Step 5 : Set to Negative and Binarize to 175 then create STL with the size you want.
Step 6 : Print and replace all your walls and ceilings with carved plaster!
I created two STL files, the first one plaster_50mm.stl was generated with a size of 50x70mm and a 3mm Z height and a base of 1mm. It should use about 14ml for a cube of that size.
The second one, plaster_100mm.stl was generated with a size of 100x140mm and a 5mm Z height and a base of 1mm. It should use 84ml for a cube of that size, so it may not work with the 60ml syringes (it could work since the 'cube' isn't full).
Unfortunately, I cannot test my creation, and I don't even want to try printing it in plastic as it wouldn't make any sense as this needs to have the plaster look & feel to it. I hope to be in the top 5 so I can see the result printed by Structur3d.