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  • uhrheber commented on BenjaminE4's instructable Dollo 3D: Self replicating 3D printer5 months ago
    Dollo 3D: Self replicating 3D printer

    BenjaminE4,some thoughts about the X and Y gears, that fit on the stepper motor axis. Shouldn't they have a bearing on the side opposite to the motor?I printed some planetary gear bearings, and they work ok, so I was thinking about integrating one into the motor mount.Maybe we could then also save one motor, but I'm not sure about that now.A printed axis between the two Y gears may have a too high twist.But I'll definitely try it.CheersUhrheber

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  • uhrheber commented on BenjaminE4's instructable Dollo 3D: Self replicating 3D printer5 months ago
    Dollo 3D: Self replicating 3D printer

    So what are you then planning to use for the Z axis?I was thinking about a printed toothed rack also for Z, but then we'd need two of them, and also two motors.Talking of motors, I've seen people using smaller, geared steppers for 3D printed printers, for cost reasons. They're slow, but cheap, and small. I could imagine using two, or even three small geared steppers for the z axis, as you don't need much speed here.It would be even possible to do an automatic levelling then.There aren't any cheap 3D printer boards, that have enough stepper drivers for that, but a set of such a motor + driver board is super cheap, so it'd be possible to just drive them with some of the spare IOs of the Arduino board. That'd require a special firmware version, but it'd be fun designing it.http://www.aliex...see more »So what are you then planning to use for the Z axis?I was thinking about a printed toothed rack also for Z, but then we'd need two of them, and also two motors.Talking of motors, I've seen people using smaller, geared steppers for 3D printed printers, for cost reasons. They're slow, but cheap, and small. I could imagine using two, or even three small geared steppers for the z axis, as you don't need much speed here.It would be even possible to do an automatic levelling then.There aren't any cheap 3D printer boards, that have enough stepper drivers for that, but a set of such a motor + driver board is super cheap, so it'd be possible to just drive them with some of the spare IOs of the Arduino board. That'd require a special firmware version, but it'd be fun designing it.http://www.aliexpress.com/item/Smart-Electronics-2...Just some thoughts...

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  • uhrheber commented on BenjaminE4's instructable Dollo 3D: Self replicating 3D printer5 months ago
    Dollo 3D: Self replicating 3D printer

    I don't fully understand what to print.In the folder NEW_long_ties, there are the long, straight elements named extension.scad. Are they meant to replace the old extension elements with holes?If so, it seems that you mount the racks to them using the long bow ties.But how do I mount the twist_corner? It seems that they still need the short bow ties. Do I have to use the old extensions for the vertical beams?

    Thanks for the quick answer.And thanks for the offer, but I already have all the electronics parts. This isn't my first printer, and I like to tinker around, so I have lots of heatbeds, extruders, hotends, Ramps boards, etc.But if the design works, I'll send you a donation.I'm not even sure whether I'll build a complete Dollo. I was just curious whether a fully printed frame would be rigid enough. I think it is, if I add some glue.Also, I was curious about how well the X and Y gears would work. We'll see.The Z axis I don't really like. It's interesting to have a a fully printed solution here, but I'm not convinced that it'll work. The plate is only guided at two points, so I think it'll tilt. Especially in the full sized version. Also, I don't think that the PMMA plate that holds the ge...see more »Thanks for the quick answer.And thanks for the offer, but I already have all the electronics parts. This isn't my first printer, and I like to tinker around, so I have lots of heatbeds, extruders, hotends, Ramps boards, etc.But if the design works, I'll send you a donation.I'm not even sure whether I'll build a complete Dollo. I was just curious whether a fully printed frame would be rigid enough. I think it is, if I add some glue.Also, I was curious about how well the X and Y gears would work. We'll see.The Z axis I don't really like. It's interesting to have a a fully printed solution here, but I'm not convinced that it'll work. The plate is only guided at two points, so I think it'll tilt. Especially in the full sized version. Also, I don't think that the PMMA plate that holds the gears will be rigid enough. I'd rather use an aluminium or Dibond plate here.I think I'll try your Z axis just for fun, but I'm rather convinced that I'll end up with a classic version, using either one threaded rod and two guiding rods, or two threaded rods and two motors.But I'd be very pleased if the plastic version should work.Oh, and btw: I encountered a problem in your OpenScad code when using a new version of OpenScad.You're using an include file named "include.scad".Openscad refuses to load this, because "include" is a reserved keyword. I had to rename it to include2.scad.Also, it isn't possible to include the same file twice. So if you include file 1 in the main file, and you include file 2, that also includes file 1, you'll get an error. This is a normal behavior that most programming languages show. Before including a file, you should test whether it is already included, which is common practice.Thanks for the interesting design, and keep up the good work

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  • uhrheber commented on onkelgeorg's instructable Affordable Rock Tumbler6 months ago
    Affordable Rock Tumbler

    Thanks, but not completely.What length is the shaft, and how did you generate the big wheel without the shaft, and the holes nearer to the axle?

    I'm using a motor with a different rpm, so I have to adjust the gears.Would you be so kind to release the settings you used for your gears, so I could use them as a starting point?Thank you.

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