Gen "L" is a Reprap electronics design optimized for total cost and hackability. It is based around the Allegro 3992 motor driver and Teensy 2.0 microcontroller. From 12-50V, it drives 4 axes (X/Y/Z/E) and has two Z-axis motor connectors to acommodate the Prusa Mendel/Clonedel designs. Unique among the Reprap electronics packages, it supports 1/32nd microstepping and per-driver and software current control. Also unlike other packages, the Teensy microcontroller used on GenL has a a built-in USB interface and can be quickly reprogrammed at any time simply by hitting its reset button. Overall, this should make it possible to create more accurate machines that dissipate less heat (through adaptive current control) than existing ones all at a price significantly less than any other option. 

While hardware is ready, there is no software available, yet. It should be possible to port an existing Reprap firmware (such as Teacup) to GenL however given the Teensy's massively higher USB bandwidth relative to Arduino-based boards (~6Mbit vs ~115kbit), it should be possible to write a much smaller, simpler firmware that offloads all of the compute intensive, non-realtime processing to a host computer. 

To help jump-start software development, I am selling GenL parts kits from the first batch at cost. If you would like to help develop the firmware (or need a 4-axis CnC driver board sans software), I can ship you a kit with all the parts you need to get up and running. A complete electronics kit (including opto end-stops, cables, a Teensy, and motor drivers) costs $75 + shipping. If you already own some of the required parts, partial kits are available for less. Pre-assembled, pre-programmed boards should be available for ~$125 towards the end of this year. E-mail me (logan@datacurrent.com) if you are interested and indicate the type of kit you'd like (from the options below). If you're not ready to hack on the firmware, stay tuned! Pre-programmed kits will be available soon. 

Kit Options:

• PCBs only: $8
• …and motor drivers: $24
• …and other discrete parts: ~$40
• …and Teensy: ~$60
• …and off-board parts (optos, thermistors, power resistors): ~$75
• …and USB cable: ~$78

Specifications:

• CPU: Socket-mounted Teensy 2.0 (ATmega32U4 microcontroller w/Full-speed USB)
• Drivers: 4, X/Y/Z/E
• Motor Driver: A3992
• Driver Voltage: 12-50V
• Max Driver Current: 0-1.5A (software programmable in 0.5mA steps)
• Step Accuracy: 1/32nd (0.05 degees on 1.8 degree steppers)
• Heaters: 1, up to 10A
• Thermistor: 100k ohm NTC
• Dimensions: 3.2" x 4" (driver board),  2" x 2" (controller board)
• Design: Mostly Through Hole (heater driver MOSFET is SMT)