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These two carriages are a simple way of easily positioning the y carriage on the rails and do away with the need for four separate bearing holders that each need to be mounted and aligned.
You still need a lower carriage on top of this to mount the upper carriage from and then your pcb heater.
The next evolution of this is http://www.thingiverse.com/thing:29744 which does away with all the bits in between the pcb heater and the carriage at the cost of a longer print time.
One piece X-axis carriage with LM8UU in Heeks by Wired1 is licensed under the Creative Commons - Attribution - Non-Commercial license.
So what's this mean?
We're sure Wired1 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!