UP mini 2 extruder carriage

I couldn't find where to buy a new one so I copied the original part design and beefed up the belt clamp (that's where it broke initially). you will also need to press out the captive ball bearings from the original but the linear bearings are integrated (they are a bit stiff to begin with but move them along the linear rods for a minute or two and they are better than the originals.