Price: ?155.00 Smoothstepper is a motion controller board.It works together with MACH3 through a plugin.The Smoothstepper can be used on new computers, where LPT port not exist. It is using the USB port to connect to the controller/host PC. It also supports extremely high step frequency, upto 4MHz and have many I/O pins to control spindle speed, coolant, JOG-wheel, etc. Download the full datasheet here!