The company tells us the 500 (500 mm³ build volume) version of its open source, configurable 3D printer has long been the most popular size, and that production costs and keeping full inventory for the less popular 300 and 400 versions no longer made sense.
Right now, those models are up to 10% off on the RatRig webstore. Owners of 300 and 400 will continue to benefit from all warranties, support, and software compatibility, the company tells us, with spare parts remaining available for the foreseeable future.