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09-26-2019, 03:52 PM #1
- Join Date
- Sep 2019
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- 2
Had to edit this post 4 times due to the problem you were describing. All paragraphs etc gets mashed into one big cluster of words. Really annoying.
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I was thinking about getting the Duet Wifi or a Smoothieboard. I guess they both would do the trick - so I'll just see what I end up with.
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When it comes to the step/dir compatible servos, could you give me a link to an example? I've tried to find some, but without luck.
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When it comes to the sound I want to get away from; I'll admit my prejudice is based on other 3D printers (My China kit in particular). But even the Stratasys we have at work (apparently a very expensive printer according to my superior) is noisy as hell. It's a pretty noticeable motor sound from it - a sound I have never heard from servos. Therefore my presumption that servos in most cases should be quieter. But of course, AC/DC or Brushed vs. brushless is also a factor. I was thinking going for a AC brushless servo. Also, the videos I've seen of guys converting to servo-drive on their 3D printers seem to gain quite amazingly low noise levels.
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I was thinking of going for something like this; https://www.ebay.com/itm/JMC-100W-0-...gAAOSwAbpdZNwc
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I'm starting to think making my own Arduino controller is my only shot to make it work with something like that though. I came across something called ServoStrap here the other day, and it seems to be exactly what I need. I just need to play around with it for a bit, and see what I can make of it. I'll have to build a test-bench of similar controls first though.
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ServoStrap: https://github.com/danithebest91/ServoStrap
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It recently came to my attention that we have quite knowledgeable contacts on the subject through my employer. A collage of mine will introduce me when possible - so maybe I can get some help from that end on how to attack this.
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I definitely see the potential in this for a lot of hobbyists, but I would rather put the extra money into a propper servo with encoder. Thanks a lot tho, I am sure I can put that to good use in other projects.
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I don't have any specific parts that needs to be that big. However, I am planning to have quick exchangeable extruders, so I can switch materials, and nozzle sizes faster. This includes a Volcano setup with 1mm or 1.2mm nozzles. I've never printed with these before, but I presume they would make it easier to build large things with less warping. For example a chassis or larger constructions. For the most part regarding the size, I want a big build area for printing large series of different parts at once. Print times doesn't really worry me, but I agree on the increased chances of something going wrong. I am willing to try nevertheless. Thanks a lot for your input!
<br>Last edited by MystiqueEngineer; 09-26-2019 at 04:10 PM.
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09-26-2019, 04:29 PM #2
- Join Date
- Jul 2017
- Posts
- 184
The O-Drive and Mechaduino (type either of those into google) I mentioned in my previous post are the open source/hobbyist level ones I'm familiar with. Some of the name brands usually seen in CNC routers and higher budget projects like clearpath have products that can do this as well. These days I'm not convinced spending money on a clearpath or similar servo is worth it, projects like mechaduino and O-Drive tend to be more feature rich and customizable as a result of being open source.
Again, this has to do with the drivers commonly used for steppers. I believe it's something to do with the frequency or chopping of the waveform, it's closer to the audible spectrum which gives that typical high pitched stepper whine people hear. Have a look at a printer using some TMC drivers and you'll notice the lack of motor noise. The prusa i3 mk3 is a common example if you want to watch some youtube videos on it, people tend to say the fan is the loudest part.
The main reason to switch to servos I think is speed, reliability (especially at speed) and maybe precision. I don't think most of these are relevant other than reliability. The extrusion speed will limit your printing far sooner than the stepper's max speed. And I think the bottleneck for accurate parts is also the fact we're squeezing molten plastic out of a 0.4mm or bigger bore. Servos will probably let you use higher accelerations though, which would help avoid blobbing with sharp corners and intricate details. On super detailed parts with lots of direction changes it might make the print noticeably faster.
As for type of servo, I'd ignore DC, they are noisy both regarding EMF (which can mess with endstops and other electronics) and audibly which is the opposite of what you're going for. AC and brushless DC are the same thing as far as I'm aware, at least as far as the motor is concerned.
I don't recommend making your own servo with an arduino. It is not easy an will require a good knowledge of control loops, and even then it will take a while. There's a reason so many printers use stepper and that open source servos have only really arrived in the last few years. Go with one of the existing projects, it'll be cheaper and if you want to improve or modify it from there, you can because they are open source.
https://odriverobotics.com/
https://tropical-labs.com/mechaduino/
Please explain to me how to...
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