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Pontus Borg 2020-06-24 22:07:38 +02:00
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# Huvud 3D Printer toolhead board # Huvud 3D Printer toolhead board
A very small 3D printer board for use on a toolhead. It is designed to be used with Klipper firmware. A very small 3D printer board for use on a direct drive toolhead. It is designed to be used with Klipper firmware.
Klipper has the awesome feature to be able to use multiple MCUs connected to the host over a (relatively) high latency connection. Using CAN bus it is possible to chain many small board using just a pair of twisted wires and power. A good solution for multiple head 3D printers.
![Image of Board](Board.jpg) ![Image of Board](doc/Huvud0.4Render.jpg)
Features: Features:
* TMC2209 stepper driver * CAN bus.
* STM32F103 72Mhz MCU * One TMC2209 stepper driver for the extruder
* Two MOSFET drivers fans * Two MOSFET drivers fans
* One bigger MOSFET driver for a hotend heater * One bigger MOSFET driver for a hotend heater
* Thermistor input * Thermistor input
* One endstop * One endstop
* CAN bus * STM32F103 72Mhz MCU
* USB * USB, for flashing firmware
Main power is 12-24V. 24V is preferred to keep the currents low Main power is 12-24V. 24V is preferred to keep the currents low
All done in KiCad and open source. All done in KiCad and open source.
If you are interesting in helping out, testing or eventually using this board feel free to contact me at glpontus@gmail.com.
Change ideas:
* Find a better heater mosfet, our 3.3V Vgs is on the low side for that chip.
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@ -67,6 +65,19 @@ I have done thermal stress testing of the board. It can run a big stepper at 1.5
I'll very soon order another 20-30 board to send out to brave beta testers. I'll very soon order another 20-30 board to send out to brave beta testers.
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## 2020-06-24
Ready to manufacture some more prototypes
Among many small tweaks the heater mosfet is changed to a different one with better Rds at 3.3V Vgs. If I limit the board to 24V and a 40W heater it could use the same small mosfet as for the fans.
Unfortunately JLCPCB are out of TMC2209 so I'll have to find a different prototype house that has them available. Perhaps one with 2oz outer copper layers for better thermals.
CAN bus is surprisingly robust. I have tested it through a 50m roll of ethernat cable, various sketchy test setups with star networks, breadboards, close to EMC sources etc. It always works. The Bosch engineers did a good job almost 40 years ago.
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# Can Hat # Can Hat
![Can Hat](CanHat.jpg) ![Can Hat](CanHat.jpg)
@ -74,3 +85,6 @@ As a sub project to this board I have developed a little power and CAN distribut
With some more thought put into it I think it will be a good complement to the Huvud tool board. With some more thought put into it I think it will be a good complement to the Huvud tool board.
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