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Made a polargraph with leftover parts from a Prusa i3 MK3.9 upgrade (lemmy.ca)
submitted 8 months ago* (last edited 8 months ago) by anguo@lemmy.ca to c/3dprinting@lemmy.world
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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.

1000006226

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.

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[-] Imgonnatrythis@sh.itjust.works 29 points 8 months ago

What the what? Did you just turn a 3d printer into a 2d printer? This is amazing! Only a 1d printer would astonish me more!

[-] rockSlayer@lemmy.world 11 points 8 months ago

... Would that be a seismograph?

[-] unexposedhazard@discuss.tchncs.de 9 points 8 months ago

Im afraid it would just be a thing that makes perfectly straight lines :(

[-] MaggiWuerze@feddit.de 6 points 8 months ago

That you couldn't see, since they'd have no thickness, only length

[-] anguo@lemmy.ca 6 points 8 months ago

Maybe a printer that adds Morse code on a string.

[-] ElderWendigo@sh.itjust.works 4 points 8 months ago

That's still 2 dimensions.

[-] Sabre363@sh.itjust.works 10 points 8 months ago

How do you keep the pen tips vertical position accurate as it pens around without something dragging in the drawings?

[-] anguo@lemmy.ca 19 points 8 months ago

I'm not perfectly sure I understand your question, but if you see it in action, this thing is really wobbly. Not much precision there.

[-] Sabre363@sh.itjust.works 2 points 8 months ago

I was basically just asking how wobbly it is, haha.

[-] andypiper@lemmy.world 7 points 8 months ago

Way cooler than the one I built a few months ago, but I didn't reuse parts of a Prusa! 😮

[-] anguo@lemmy.ca 5 points 8 months ago

Nice! Can't take all the credit for mine, most of the work was done by Dan for the Makelangelo.

[-] JoShmoe@ani.social 5 points 8 months ago

You’re amazing

[-] anguo@lemmy.ca 2 points 8 months ago

Haha, can't take all the credit here, I just modified the Makelangelo to work with the parts I had!

[-] Chewget@lemm.ee 5 points 8 months ago

That's really cool!

[-] DarkNightoftheSoul@mander.xyz 3 points 8 months ago

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

[-] anguo@lemmy.ca 11 points 8 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 3 points 8 months ago

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

[-] anguo@lemmy.ca 2 points 8 months ago

Hmmm, only if a second pulley was higher than the motor, I imagine.

[-] SchmidtGenetics@lemmy.world 2 points 8 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.ca 2 points 8 months ago

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

[-] SchmidtGenetics@lemmy.world 2 points 8 months ago* (last edited 8 months ago)

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

[-] anguo@lemmy.ca 2 points 8 months ago* (last edited 8 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 2 points 8 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.

[-] anguo@lemmy.ca 2 points 8 months ago

Yes. I would need to increase the weight on the pen too, though.

[-] SchmidtGenetics@lemmy.world 1 points 8 months ago

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

[-] anguo@lemmy.ca 1 points 8 months ago

I feel they're too light already 😅

[-] SchmidtGenetics@lemmy.world 1 points 8 months ago

Yeah I think you need to make it lighter?

Using the mechanical advantage for this would be for someone pulling on the rope to be able to lift a weight easier.

Your pen is the one pulling and counterweight is the weight, so you would need more counter weight or lighter weights on the pin. But too light would have its own tensions problems….

[-] anguo@lemmy.ca 1 points 8 months ago

Yes, you're right, don't know why I flipped that in my head, it's pretty clear on the diagram you sent me.

[-] DarkNightoftheSoul@mander.xyz 2 points 8 months ago

neato. Cool project.

[-] XTL@sopuli.xyz 2 points 8 months ago

I've been thinking of doing just this as well. Though with ender parts or something else left over. Very cool to see someone's actually made it happen.

[-] anguo@lemmy.ca 2 points 8 months ago

You should check this post out if you ever go ahead with it: https://www.marginallyclever.com/2021/10/friday-facts-4-how-to-marlin-polargraph/

[-] XTL@sopuli.xyz 1 points 8 months ago

Oh, I'm definitely stashing that. Thank you.

this post was submitted on 06 Mar 2024
390 points (99.7% liked)

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