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.

  • @DarkNightoftheSoul
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    33 months ago

    So are the vertical cutoffs either side the result of string length, or what’s going on with that?

    • @anguo@lemmy.caOP
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      113 months ago

      It can go further than that, i just limited it to a smaller size for my first real test. I told the software that I was drawing on an A1 sized paper. Drawing this across the full board would have taken forever.

      There are a couple of no-go zones close to the corners. Longer belts would allow it to go lower, but then the counterweights would hit the floor when going up high and limit the drawing area there instead.

          • @SchmidtGenetics@lemmy.world
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            23 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.

            • @anguo@lemmy.caOP
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              23 months ago

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

                • @anguo@lemmy.caOP
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                  3 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@lemmy.world
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                    23 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.