OK, so now maybe you're printing, maybe you're not. No one's ever replicated a V3 Trash Printer before (that I know of) so I don't know if that GCODE will really work on yours on the first try. If you find out, let me know! Either way, you'll eventually want to start printing something other than the Hackaday logo (no offense) and to do that you need to know how to use Slic3r, so you can slice your own files.

Open Repetier-Host, and click on the "Object Placement" Tab

Hit the Plus button to add an object, typically an STL, which you can download from places like Thingiverse. 

Then click the "Slicer" tab

Hit the "Configuration" button, and Slic3r will open in another window, with a wide range of options to configure.

These settings took me a long time to get just right, and to be honest, I don't really know what I'm doing for most of them, still, which means you don't have to either! These are the settings I'm using for my "Printer Settings" , "Filament Settings", and "Print Settings". The print settings are the most important for the print, but all of them should match for good results. I know these settings work well enough to start with, so load these up, save them (you have save 3 times - Print, Printer, and Filament) Use these settings as a jumping off point, and experiment from here!

If you know what you're doing here, please do it! And let us all know how it goes.

A wise person once told me, "Sometimes, the best way to convince people to help you do something hard is to just start doing it badly in front of them." So this is me, doing it badly in front of you.

This is the best I've figured out so far, and I'm going to keep hacking on it. But I only know so much, and I can only do so much. We could do so much more, so much faster, if a lot people were hacking this project, applying their unique skills, knowledge, and cleverness to make it as cheap, and efficient, and easy to build as possible, so that as many people as possible can turn their as much of their trash into the widest possible range of anything they want.

If we have identical machines, we can swap GCODE, without slicing, and build a library of known trash-printable parts. Imagine a trashprinter with a built in touch-screen menu of parts, and built in plastic shredder. Maybe we could even integrate that awesome AI plastic scanner that Jerzeek has been hacking on somehow to get it to auto-sort trash and to make it into a kind of solar-powered trash-eating vending-machine kiosk?

What improvements do you think you could make to it? Do you think you could find a way to make it cheaper, easier to build, or more energy efficient to operate? Less ugly? Do you think you could tweak the code to figure out how to get it to print better, more complex things, out of dirtier, lower-grade material? 

Do you believe that there is such thing as disruptively useful information?

I do. 

Let's find out.