I have given up on getting the RUMBA board to work. I tried to add a P.I.N.D.A. (or PINDA) probe, but that didn’t work. I tried to add a BLTouch sensor, but that didn’t work either. Now the RUMBA board is not communicating with my PC.

So I have moved on to using a Mini-Rambo but the one drawback is that it only has one extruder capability. I would like to know if there is any way to add an extruder to the Mini-Rambo. Whether it be a separate board or soldering or something. I am open to anything.

  • $\begingroup$ Welcome to 3dPrinting.SE! $\endgroup$ – Pᴀᴜʟsᴛᴇʀ2 Jun 10 '19 at 1:47
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    $\begingroup$ This question needs more information to answer. E.g. some pictures of the board and the brand. Please add information by edit. $\endgroup$ – 0scar Jun 10 '19 at 15:01
  • $\begingroup$ It sounds like you should post another question (or two), relating to why you can't get your RUMBA board to work :-) One for the PINDA and one for the BLTouch. When/if you do, please include in your questions, what exact steps you have tried and what did not work. $\endgroup$ – Greenonline Jun 10 '19 at 19:58

I would say that the clue is in the name, MiniRAMBo. The Mini part is related to its diminutive size and reduced functionality.

Extending the board would require patching in a secondary board to the MiniRAMBo board via pins1 that may or may not exist, and would probably be more trouble than it is worth.

Looking at the board layout certainly shows that there are not any readily available connections for such an expansion.

enter image description here

If you want two extruders then the RAMBo would be a better bet, as it has 5 stepper motor driver outputs. It would certainly be easier, and quicker (as well as cheaper) than a MiniRAMBo plus a secondary daughter board).

That said, as the MiniRAMBo has two Z-axis controllers, it may be possible to repurpose one of them, if they are wired independently of each other and separately controllable. Although these lines suggest otherwise:

It has 4 stepper drivers and 4 mosfet switched outputs.


Differences from Rambo

MiniRambo has:

  • 4 stepper drivers vs. 5


Motor Drivers

4 A4982 1/16th microstep motor drivers(2 connectors on Z for Prusa Mendel and other dual Z printer designs)

So, it would appear that the two Z axis drivers are wired together.

1 By pins, I mean external board pins/connectors - rather than the pins of the µController itself

  • $\begingroup$ The two Z connectors are, in fact, controlled by a single driver. I also thought it is the mini-Rambo, therefore the request to the OP to expand the answer. That board is very limited, exposing more pins would mean soldering to the microprocessor, which is pretty impossible for most people. $\endgroup$ – 0scar Jun 10 '19 at 19:17
  • $\begingroup$ I've added a clarification. Thanks for pointing out the confusing line :-) $\endgroup$ – Greenonline Jun 10 '19 at 19:53

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