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mbed 3D printer PCB

bohne
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Published on September 19, 2011

Description

This PCB connects an mbed microcontroller board [1] to a Sparkfun Quadstepper Motor Driver Board [2].
I use it for my RepRap Prusa Mendel 3D printer but you can use it for any CNC machine.

The firmware [3] for the mbed board is based on the Tonokip firmware and is compatible to ReplicatorG using the fived driver.

There are jumpers for a 100k thermistor, a hot-end (via 3.3V mosfet) and a thumb-joystick.

Update: new version (mbedquadstepperminimalNOatmega8u2.brd) has 2 mosfets and 2 thermistors and 3 min-endstops pins... but no support for atmega8u2 or thumb joystick anymore...

[1] mbed.org
[2] sparkfun.com/products/10507
[3] github.com/renebohne/RepRap-Firmware-for-mbed-microcontroller

Instructions

You can mill (or etch) this PCB using single-sided material. There is only one jumper wire (on the top layer).

Adjust the firmware to your printer and have fun printing :)
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nullsub on December 1, 2011 said:

Could I also use 4 simple stepstick drivers(If I change the pins accordingly)? Or is the frimware not compatible with them? That would make it cheaper.

nullsub on February 21, 2012 said:

Seems to work so far. Thanks for your work

Bluemetal on September 20, 2011 said:

Would it be difficult to add an additional thermistor (input) and Mosfet (output) for a heated build platform?

bohne on September 20, 2011 said:

I now also updated the firmware so it should support the heated-printbed using M140. untested...

bohne on September 20, 2011 said:

untested, but I uploaded two more files with a new design:

mbedquadstepperminimalNOatmega8u2.brd has 2 mosfets and 2 thermistors and 3 min-endstops pins... but no support for atmega8u2 or thumb joystick anymore...

So you can control a hot-end and a heated buildplatform... and you can add x-,y-, and z-min endstops

untested board, I will try it later - ma
ybe somebody is faster than me and can post results?

Fishedbear on September 20, 2011 said:

I would like to add a function for Automated Build Platform in request list, too! :-P

This work would stimulate to make users in mbed community work for RepRap.

Really great work. Thanks. :)

Unknown on September 19, 2011 said:

Thanks for this amazing design. I got a quadstepper a while back and wanted to do this but have been short on time.

bohne on September 19, 2011 said:

Thankx!

I really love the quadstepper. I always had problems with the RAMPS and pololu solutions. Quadstepper made no problems so far - enjoy!

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License

mbed 3D printer PCB by bohne is licensed under the Attribution - Non-Commercial - Creative Commons license.

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