I looked for the same files they dont seem to exist.
I have Acrilic set asside to make the extruder from.
The thereory is you can take AOI files and create an STL.
Usualy I find after an hour or two of struggling with AOI I give up.
The application Nophead uses is called Co-Create that is excelent.
I don't know how you can get an AOI file into co-creae though.
I have downloaded the Linux version of AOI to see if its any better.
I still have not got arround to trying it out.
I now do not like AOI due to number of hours spent trying to get AOI to do what I want and giving up.
Bodge It [
reprap.org]
=======================================
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Buy the bits from B&Q pipestrap [
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How to Build a Darwin without any Rep Rap Parts [
repstrapdarwin.blogspot.com]
Web Site [
www.takeaway3dtech.com]