Anet A6 Z-Carriage (modular, parametric)

Description

This is a modular Z-Carriage upgrade for the Anet A6-printer. It replaces the stock carriages (those pierced with lots of screws).The stock carriages don't have a belt tensioner which I consider to be crucial for good quality. I was a bit unsatisfied with the existing upgrades, as I had troubles to get the perfect measures due to warping issues.The model I developed is 100 % parametric, so everyone can edit measures and tolerances at will.My priorities were roughly:perfect distance of the x-rodsperfect fastening of the x-rodsmodular design to be able to replace single parts and reduce print time on failure (implicitly supports multi color prints)reducing the need for supportsability to upgrade to plain bearings (like Igus)optics and customizabilitySome detail decisions:The holes for the rods in the braces seem to be oddly shaped: They aren't circles but beveled 8-sided polygons. The rod fits in easier and straight-lined holes can be printed more exactly than curved walls. The polygon is oriented with vertices in each main direction so the rod can be exactly centered without touching the clamp's gap. The polygon is beveled for making the hole not bigger than necessary - some walls are already very thin. Another beveling makes a slight funnel for easier insertion and reducing an elephant's foot which could make the hole too small for the rod.Some screw holes where you'd expect to have the shapes of hex nut & screw head simply have two hex nut holes. For most of those holes…