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For a reprap, microstepping is probably overkill since the current positioning resolution is already so much smaller than the detail that can be achieved with our current extruders. That being said, it certainly doesn't hurt to have it.
Having the stepper drivers on an SPI bus sounds nice, especially with some of the processing offloaded to them. It would require some major reworking of the firm
by
unlimitedbacon
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Developers
This is exactly what I need. Hopefully you can bring the price down a little in the future, though. $200 is about the cost of a RAMPS kit + 5 more stepper drivers, so thats the target you want to hit.
Simba Wrote:
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> Also, the board has a first ever - overpowered
> regulator. It can take up to 24VDC and convert to
> 5VDC for arudi
by
unlimitedbacon
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Developers
Thank you. I should have actually bothered to count the pins first. It should have barely enough pins with the extra steppers, heaters, thermistors, fans, etc. so RAMPS is what I will go with for now. Nevertheless, I'd still like to hear what people think of the multiplexing thing.
by
unlimitedbacon
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Developers
Update:
I have parts! All the vitamins are there. Laser cuttings are laser cutted. Printed parts are being printed. This means I'm committed now. I'm going down the rabbit hole.
As far as the electronics, I'm planning on using a standard RAMPS with an expansion for the extra print heads. It should have enough extra GPIO pins to handle it (barely). ARM is definitely the future, but at this poi
by
unlimitedbacon
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Polar Machines, SCARA, Robot Arms
I'm designing a printer that will have a lot of extruders. Its going to need 10 independently controlled stepper motors. Obviously this is beyond the limits of the current electronics. One solution would be to use a different microcontroller with many more GPIO pins (probably the Arduino Due). However, I imagine a future in which there will be machines with an even more absurd number of motors. I
by
unlimitedbacon
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Developers
McMaster provides tolerances for all the rods they sell. Perhaps you could look up a similar rod to get an idea.
by
unlimitedbacon
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General
It seems like the logical first step towards this would be to get a decent revision control system working with CAD files.
by
unlimitedbacon
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General
Fascinating, because my Cupcake is exactly the reason I put two motors in. The Z axis starts skipping steps above about 100 mm/min, although that's probably due to bent lead screws and a cheap motor I dug out of a box at a swapmeet. The Prusa Mendel also used two motors. It may be overkill but I think its safe for a proof of concept.
I may have gone overboard with the idlers. I can get rid of m
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unlimitedbacon
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Polar Machines, SCARA, Robot Arms
So I've been thinking about the electronics and I think the best thing would be to have multiplexed stepper drivers. Then you could basically hook up as many as you wanted using ribbon cable.
You would not be able to send a step pulse to two drivers simultaniously, but I don't think that really ever happens anyways. In any case, as long as it switches fast enough it shouldn't matter.
by
unlimitedbacon
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Polar Machines, SCARA, Robot Arms
So I redesigned it to use a lasercut frame instead of the threaded rods. It may be somewhat less reprapey in this form but theres a couple of advantages.
1. Its cheaper
I figuretively spit my coffee out when I realized how much all that threaded rod was going to cost. There was 15 meters of it. From McMaster, that would have been $60 for the cheap stuff. So assuming I can get access to a laser c
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unlimitedbacon
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Polar Machines, SCARA, Robot Arms
Hello Everyone, its time to do science.
I'd like to do a comparison of the moving mass of various types of printers since this seems to be the main factor affecting acceleration. Suprisingly, there seems to be very little data about this online. I think it would be really interesting and useful for optimizing designs.
If you have some free time and a scale, could you post the weight of the movi
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unlimitedbacon
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General
Thanks for the support everyone.
DeuxVis Wrote:
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> Beautiful design. I am eager to see how you will
> deal with the control electronics and software.
I'd love to hear some suggestions about the electronics. With 4 stepper extruders, it would need to drive 10 motors independently. 1 ϴ Axis + 1 Z Axis + 4 R Axis + 4 E Axis. Right now th
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unlimitedbacon
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Polar Machines, SCARA, Robot Arms
Greetings Everyone,
I was trying to find a way to build a printer with more than one or two extruders and this is what I came up with. Its not quite the same as the polar printers that have been discussed here before. Its basically a giant 3D printing record player. All the designs are up on Github in Solidworks format.
Features:
+ 4 extruders for multiple colors and materials
+ 320 mm print pl
by
unlimitedbacon
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Polar Machines, SCARA, Robot Arms
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