by tbuser, published
Inspired by a comment on this article suggesting we have a subroutine that printed a recycling mark on every part we make: blog.makezine.com/archive/2011/04/polite-houseguests-print-and-repair.html
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Instead of embedding this in the models geometry you could also draw it in Gcode and add it to the models Gcode (will do a test NOW!). Would be great if Skeinforge could add it as default.
In regards to the codes, for the moment its not much use to label it as OTHER, PLA was proposed as 0 but rejected, sad:
"In 2007, a State Senate bill in California (SB 898) proposed the marking of PLA with a new "0" code. However, this part of the bill was removed before passage." from Wikip
Now there are various labels in use for compostable items....
And as Vic said, Galactic here in Belgium is doing trials with chemical (vs mechanical) recycling of PLA. So the quality is the same as the original PLA. More info at http://www.loopla.org/
PLA Is actually recyclable. If you can find someone who will take it. But it can be used to improve the flow of other recycled plastic mixtures as well.
I'd suggest that you mark PLA as 7-in-a-recycling-symbol with
lt; underneath it. Just marking it as "7" gives the recyclers very little clue as to what plastic it is, only what plastic it isn't.
(ABS should be marked 9 and ABS, since 9 is a semi-official code. HDPE has an official code, 2, so the text isn't strictly neccessary. I think that covers all plastics in common use in the community.)
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1. Set font to Bitstream Vera Sans, font size 144
2. Add text, press CTRL-U to enter unicode code number for the type of plastic, ABS is type 7 so it's code is 2679, press enter. See codes at en.wikipedia.org/wiki/Resin_identification_code
3. Select symbol, right click, object properties give it a name like recycle, click set
4. File -> Save As -> EPS, check convert texts to paths, limit export to object with id set in previous step
5. Run: pstoedit -dt -f dxf:-polyaslines recycle_7.eps recycle_7.dxf
6. Plug it into recycle_maker.scad, might need to play with the origin and scale to get it into a nice size, compile it to an stl and use something like Pleasant3D or ReplicatorG to center it
7. Now you can stamp it into your model like I did in recycleinate.scad!
PS: I had to simplify and remesh the dalek model in meshlab in order to get openscad to process it correctly. I put the recycle logo on the bottom, so download it or view it in thingiview in order to see it.
PPS: not all recylcing centers will recycle type 7 plastics, check with them to make sure they take ABS. Type 7 is a catch all code and includes PLA, but PLA isn't recyclable, it's compostable (in comercial composting facilities that is).
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