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The easiest way to stabilise the z-axis is to connect them with a rod. More stiffness you will reach with two rods. In combination with a additional clamp between the rods will generate a rigid frame.
Before you fasten the clamps make sure that the z-rods have the same distance on top as on the base. With out this stabilisation the z-rods are free to align to the x-ends. If the stabilisation frame is mounted the z-rods are fixed and can't move anymore.
While fasten the clamps the x-ends have to be on the highest possible position to get the exact distance.
If your Printrbot is long, you can take more of the "double clamp middle" between the ends.
Control if there is a collision between the frame and anything of the x-unit. If so, edit the z-max position otherwise you will have now a very robust unyielding mechanical endstop ;-)
To assemble you need:
4 srews M3 x 20 mm with nuts and washers
8 screws M3 x 12 mm with nuts and washers
2 smooth rods 8 mm as long as you need
Now the frame looks a bit like a handle but even though never use it to lift your Printrbot ;-)
Z-Axis Double Rod Stabilizer for Printrbot by wersy is licensed under the Creative Commons - Attribution - Share Alike license.
So what's this mean?
We're sure wersy 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!