3d Printer recycling problem

Here's the situation:

Its 25 years in the future*
A quick purge is being done of a child's surplus & broken toys. There are all 3d printed, so they are all tossed into the household's feed hopper. The printer in question, a Quoc 222, is a ordinary Wal-Mart retail machine, capable of using all kinds of thermoplastics.
As long as they are fed into the hopper separately, that is.
This isn't a problem, most of the time: nearly everything is  made out of baby-safe ABS, so objects are binned without any more than a cursory glance. But every now and than, some polyethylene slips in, or even PVC, and it crushed in the hopper, and ends up in the output flow, spoiling a print for a variety of reasons, or even jamming the printer.
That's okay, they have a solution for this: the printer is opened, the contents of the hopper and the spoiled print are thrown in the garbage,and a fresh job is started, using a fresh block of printing plastic, all bright and shiny from Walmart.
So what just happened here? because of mis-identification of plastic feedstock, a non-insignificant amount of plastic gets thrown out.

If we don't implement recycling of printed objects, than all the '3d printer revolution' is going to do is add to our solid-waste plastic recycling/disposal problems.
Steps are being taken to deal with this: if you have a printer, it only makes sense to get a filament extruder as well, but there is a big BUT lurking...

What kind of plastic is the thing you are holding?
ABS,PLA,PVC,PE,PS...? They are not cross-compatible, no matter how clever a printer you have.
A experienced maker/hacker/model engineer/tinker can  usual tell, the way an experianced metalworker can usually tell what kind of metal he's holding. Frik & Frak, gathering up junk in their living room, so that they can print a new doo-dad are unlikely to possess that skill.

This is isn't a completely unknown problem. Small consumer goods are  already marked with a recycling number (Compliance seems to be so-so).
Its right now , while printers are in their infancy, that we need to start doing things like designing the printer software to automatically print a plastic type number on an inconspicuous point on the print.
If this becomes good practice now, its likely to stay implemented.
Right now, most printers use a single kind of plastic, and the tinker that owns it is going to use Mark 1.0 wetware to keep track of their plastic.
But as multi extrusion heads become more common,and as printed parts disseminate into the Great Wide Open, this little problem is going to become a big one.

Example: Hackaday released a logo badge on Thingiverse in 2010. They pointed out that their fans could also have one printed via Shapeways.**  Over 3k downloads, but a unknown (apparently n >15) number of prints.
You have had one sitting on your dresser for four years. Its been 4 years, you own your own 3d printer now, its just a tool like any other...quick, whats the badge made of, and can you toss it into your filament extruder?

*a favored forward jump for prognostication. Read: near future,not to close to worry about, but near enough we're going to see it.

**I hope that ten years from now thats not going to read along the lines of references to Geocities and Tripod.

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