If you purchased the Maker to Play Upgrade kit from Printrbot.com, you will need to print these components to complete you upgrade build.  Be sure to print with 100% infill so the components come out as solid objects.The quantities you will need to print of each are;4 - Z Axis Rod End1 - Sensor Clamp7 - Universal Bearing Clamp1 - X Axis Bearing Clamp4 - X Axis Rod Clamp1 - Y Axis Rod End Front1 - Y Axis Rod End Back