3d printers

Plans
http://www.ebay.com/itm/DIY-plastic-injector-mold-machine-PDF-PLANS-/281443092333?pt=LH_DefaultDomain_0&hash=item418750c76d pdf plans on injection molding machine

http://www.ebay.com/itm/281450613268 3d delta printer, plans in solidworks format

Gear maker
http://www.plagear.com.tw Plastic gears

3d
http://www.3d-printer.co.za

http://www.ultraflow3d.co.za

http://www.sumpod.com/

http://www.indiegogo.com/projects/sumpod-3d-printer-and-mini-cnc-round-2

3D-Manufacturing
http://www.thingiverse.com/thing:7975

You might also want to mention: RepRap -- http://reprap.org Fab@Home -- http://fabathome.org and Thningiverse - http://www.thingiverse.com

Also, even though it's not 3d printing, shopbots might also be worth a hat-tip.

Bearings
http://www.instructables.com/id/Nylon-Printable-608-Ball-Bearing/ Nylonn printable ball bearings