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The thrust bearings replaced with the more common 608 bearing. Not most 608s aren't designed for thrust, some are. That said even if they aren't designed for thrust at least now you can print and use this with bearings you probably already have. Note deep groove 608s have a fair thrust rating. For example: http://www.vxb.com/page/bearings/PROD/kit8780
If you decide to use an M8 threaded rod for your leadscrew you'll need: http://www.thingiverse.com/thing:34826
Proof of concept video here: https://www.youtube.com/watch?v=Qap55vV6yhM
608 bearing version of Actuator by TrinityLabs is licensed under the Creative Commons - Attribution - Share Alike license.
So what's this mean?
We're sure TrinityLabs would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!