BIQU B1 3D Printer TFT35 V3.0 Touch Screen SKR V1.4 32 Bit Dual Operat – Biqu Equipment is a great printer to start with. It comes with all the good electronics. color dual mode touchscreen, 32 bit controller, silent drivers, and a simple aluminum extrusion frame. Upgrades for this machine would be linear rails n guides to replace the rubber v-wheels and a second Z stepper motor. It also appears it would be rather easy to stretch any of the axes.