UP mini 2 extruder carriage

thingiverse

I couldn't locate a retailer selling replacement parts, so I duplicated the original design and reinforced the belt clamp – it was the initial point of failure. To replicate this upgrade, you'll need to remove the captive ball bearings from the original component, but the linear bearings are already integrated; they may feel stiff at first, yet after moving them along the linear rods for a minute or two, they surpass the performance of their original counterparts.