While moving to a new place, with lots of space for all my electronics,
I found some spare-time to update the 3DPCB to Rev C.
Rev B did never turn out to something, so I went directly to Rev C.
Some changes from the original design has been made:
- It now has five stepper drivers, but has changed from A4982 to DRV8825.
- The MOSFETs has been changed to STL60N3LLH5 – 60A / 30V (Max 60W, but has 0.0063 ohm typical @ 10Vgs) – Also added one extra.
- Added pinouts for the stepper drivers
- SPI is broken out with through hole instead of SMD pad. But it’s with 1.6mm pitch
- Broken out some extra pins for fun.
- Added resistor/capacitor network to reduce bounce from end-stop-switches.
- Added 5V regulator with solder-jumper to change voltage on endstop-connectors between 5V and 3.3V
- Added an extra MOSFET driver – Lower internal resistance on MOSFETS.
- Changed a lot of pins around, for easy layout.
- Still rocks a two-layer! Even if heat-dissipation is not as good as four-layer, I’m doing fine with this.
The original design I made has been printing over 200 hours now.
I’ve sent the PCB into production, so I will do a test whenever I have the PCBs and have soldered it all together.
Whenever I have a succesful test, I will upload the design to my code.google.com account.
A 3D picture of the design:
And here’s the schematic: 3DPCB – Rev C schematic
Now, let’s mount two print-heads on my Prusa!