I upgraded two Prusa MK3s to MK3.9, and ended up with a couple of spare boards, stepper motors and a bunch of other things. So I decided to turn them into a Makelangelo clone!

Since the school I work at had these large standing whiteboards, I designed and printed corner brackets to hold the motors, as well as a base for the electronics.

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I’m still having trouble with the homing process, but very happy with the results so far!

I’ll be posting the firmware and 3d printed files online soon.

  • @SchmidtGenetics
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    37 months ago

    Would a block and tackle solve that problem? Could 3d print them likely.

      • @SchmidtGenetics
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        27 months ago

        You can use multiple pulleys and shackles to take the distance of the rope up.

        It’s how they do it inside of machines as far as I’ve seen.

        • @[email protected]OP
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          27 months ago

          I still feel the distance they travel will stay the same. Except if I use a gear train.

          • @SchmidtGenetics
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            7 months ago

            Using #4 would allow you to move the pen 40cm for every 10cm of counterweight travel.

            • @[email protected]OP
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              7 months ago

              Ah yes, different sized pulleys would work the same as the gear train I had in mind. Thanks for the explanation!

              Edit: on second look, it’s more complex than that, as the weight is not connected to the end of the rope, but on a pulley.

              • @SchmidtGenetics
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                27 months ago

                Likely number 2 would be enough, would double the distance itself. You just need to attach it to the same corner bracket and have a pulley with the weight under it.

                  • @SchmidtGenetics
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                    17 months ago

                    Smaller counterweight may work as well. Can take or add to either side of the equation.