The 3dWrx brand of printers pioneered the Posi-Drive Leveling concept, which completely eliminates bed leveling problems. With the Posi-Drive concept, auto-leveling systems are obsolete. Bed leveling problems occur because it is simply impossible to keep two Z axis motors in sync with each other. Stepper motors are not designed with that kind of accuracy. Posi-Drive uses only one Z axis motor which is synced to the two Z axis screws with a timing belt. Users report printing over 5,000 with consistently level beds.
3dWrx/WrxWare LLC projects are supported by contributions from the open source community. That support is crucial for continuing development.