MiniRambo swap to MKS GEN L

New Home Forum LowRider Advice – LowRider MiniRambo swap to MKS GEN L

This topic contains 9 replies, has 3 voices, and was last updated by  John 3 weeks, 6 days ago.

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  • #103483

    John
    Participant

    Hi everyone,

    My miniRambo no longer wants to talk to my steppers for some reason (all fuses checked).

    I have a spare brand new MKS GEN L v1.0 with TMC2208 drivers.  I have uploaded the dual endstop firmware (going with endstops since I’m making the change) for the ramps board as suggested by people who have done it.

    Questions:

    1. Does anyone know if i have to change the steps/mm going from the miniRambo board to the GEN L? If so, what should they be?

    2. Do I plug the steppers in using the RAMPS board diagram?  X1 to X, X2 to E0, Y1 to Y, Y2 to E1???

     

    Thanks guys.  Looking forward to getting back to cutting, and homing!!!!

     

    Cheers John

    #103491

    Ryan
    Keymaster

    Those two boards are significantly different, you need to do extensive firmware edits to use dual endstops and those drivers. I do not have a pre-made firmware for that.

    #103493

    John
    Participant

    Ah OK.   I’m guessing the pins are different for starters.  I did see somewhere someone sharing their dual endstop firmware for the GEN L.  I might start with that and adjust steps as I need to afterwards.

    #103494

    John
    Participant

    Hey Ryan, is it worth sending the miniRambo back to you for a possible replacement?  Is there warranty on these things?  It’s definitely under 12 months.

    Lights come on, display shows normal, just nothing happens when I tell it to move.  As I’ve said, all 3 fuses are fine.  Any other suggestions?

    #103498

    Ryan
    Keymaster

    Have you tried re-flashing it? You might have messed with the eeprom and not realized it. Everything working except movement on all three axis is not something that is even easily possible to do.

    #103500

    Jamie
    Participant

    (mini)RAMBo is totally different from MKS, but MKS is extremely close to RAMPS, no?

    Perhaps start with RAMPS firmware and change motherboard definition in Configuration.h to reflect MKS (BOARD_MKS_GEN_L) and you should be almost there.

    I would assume your TMC2208 driver modules obey the same STEP/DIR/EN pinout (like this one for example https://e3d-online.com/tmc2208) so you would just have to update the steps per mm.  It appears to operate at 1/16th microstepping at the STEP/DIR level (with finer “interpolation” internally) so starting from Ryan’s RAMPS code, divide all steps per mm values by 2.

    And then follow RAMPS plugs: X1 to X, X2 to E0, Y1 to Y, Y2 to E1.

    #103501

    John
    Participant

    I will re flash and see what happens.  I’ll keep you posted.

    Thanks

    #103504

    Ryan
    Keymaster

    Dual gets the pins edited as well.

    #103505

    Jamie
    Participant

    Ok good to know.  But MKS pins refers to RAMPS pins so I still think it should work.  Marlin/src/pins/pins_MKS_GEN_L.h just overrides 3 things and then includes pins_RAMPS.h.

    #103815

    John
    Participant

    Hey guys, update:

    I got the MKS GEN L board plugged in and working, but I haven’t hokked up any endstops yet, so I can’t report that the endstop work (yet).  I cut for about an hour and it’s working good.

    The miniRambo, I tried to reflash, but it’s not letting me.  I have installed drivers, tried different USB cables, different Arduino versions, you name it.  It verifies, then says ‘uploading’ and just sits there and does nothing.  An orange led flickers a couple times but that’s it.  I read somewhere that it may be missing (or corrupted) the bootloader.  Whereas the MKS board uploaded the firmware straight away without any issues.

    @jamie I read somewhere that people have successfully converted to the MKS using the RAMPS firmware, so I don’t see any issues.  A bonus is I can now use my MKS TFT screen on the serial port to jog, much quicker than using the knob.

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