TWO TREES SAPPHIRE PRO GT2 Belt Tension

thingiverse

I’ve made additional modifications to the pulley arm. The first version remained in place with pins, but the new ARM 2 features a thread and nut for finer adjustments and looks more refined. I'm pleased with this improvement! After reviewing various solutions to address sagging belt issues on Sapphire and other CoreXY printers, I was struck by the complexity of most approaches. Many attempts have focused on incorporating mechanisms within the carriage itself, but this often requires significant space that's hard to come by – especially in the case of the Sapphire printer. I've taken a different approach: simplicity and reliability are key. My solution involves minimal to no printer modifications, with no need for monstrous builds or intricate designs. To implement my mod, you'll only need to print a few components, which may include two ball bearings (16mm OD, 5mm ID, 5mm H) if needed. Installation is straightforward and doesn't require any extra holes. The unit simply clamps onto the upper plate using a secure 6mm grip, working by pulling rather than pushing. It's essential to ensure that belts are properly secured on the gantry with sufficient tension, as any leftover slack can be retrieved using the unit. Please note that all parts are designed for a tight fit, so keep in mind the potential for plastic shrinkage after cooling. While I'm unsure if this device will work specifically on other Sapphire printers or modifications, it's likely to be adaptable. A similar approach could also be applied to other CoreXY printers.