FastBot3d

[XZ3RO]

http://www.fastbot3d.com/
https://www.indiegogo.com/projects/b...r-3d-printer#/
http://www.3ders.org/articles/201503...ler-board.html
https://www.kickstarter.com/projects...printer-faster

Video:
https://d2pq0u4uni88oo.cloudfront.ne...-h264_high.mp4

Documents
http://fastbot-wiki.wikidot.com/

Source
https://github.com/fastbot3d
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Technical Specs:

Microcontroller

Texas Instrument Sitara AM335x, 1GHZ Cortex-A8 ARM
2 Programmable Realtime Units (PRU) to generate really high frequency step and dir signals
4GB eMMC
512M DDR3 memory
10/100M ethernet
microSD card
USB Host to connect USB disk, WiFi, Camera .etc
USB Device interface, shows to the computer as a mass storage device

Stepper drivers

5 ~ 7 DRV8825 stepper drivers
1/32 microsteps
Each capable of driving bipolar steppers up to 45V and 2.5A
Digital control of the current setting for each driver
Outputs

3 heaters, 2 for extruder and 1 for HBP
6 connectors for fan or LED light belt, all adjustable
Inputs

3 Thermistor (ADC) inputs
1 Thermalcouple (MAX6675) inputs
6 endstops
1 connector for external power button
Extensibility

50 pins FFC connector for 24 bits TFT LCD and touch screen
connector for 2 extended steppers
connector for 3 extended heaters
Serial connector to print debug log
Lots of pins broken out, including step, direction and enable pins for the stepper drivers