Stratasys's mojo : throw-away hotends
Posted by Emmanuel
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Stratasys's mojo : throw-away hotends May 10, 2012 04:17AM |
"since the Print Engine now includes the print head right on the end of the filament"
fabbaloo.com/blog/2012/5/8/the-mojo-3d-printer.html
I'd be curious to see their hotends in real
(otherwise it seems a huge machine with less than a huxley print surface, and ressource-expensive (no density control), reprap ftw :p)
about // liberapay // flickr // wiki // thingiverse - github
fabbaloo.com/blog/2012/5/8/the-mojo-3d-printer.html
I'd be curious to see their hotends in real
(otherwise it seems a huge machine with less than a huxley print surface, and ressource-expensive (no density control), reprap ftw :p)
about // liberapay // flickr // wiki // thingiverse - github
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Re: Stratasys's mojo : throw-away hotends May 11, 2012 01:31AM |
Quote
The article
Only solid printing is permitted, ensuring very strong printed parts, but also using more material. The software does not provide an option to select a density percentage.
Yikes, that sounds terrible. This thing will be mega slow. It's also kind of funny how 0.17mm layer height is touted as if it's some kind of achievement for a commercial 3D printing company
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Re: Stratasys's mojo : throw-away hotends May 11, 2012 07:45PM |
"In addition, the consumer printer couldn’t build a usable part."
"Contrary to what consumer-class 3D printers lead you to believe, the extrusion tips must be replaced at regular intervals."
Glad to see the review is fair and unbiased
www.Fablicator.com
"Contrary to what consumer-class 3D printers lead you to believe, the extrusion tips must be replaced at regular intervals."
Glad to see the review is fair and unbiased
www.Fablicator.com
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Re: Stratasys's mojo : throw-away hotends May 15, 2012 03:12PM |
Todd Grimm Wrote:
-------------------------------------------------------
> I am the author and Stratasys did not write, edit
> or direct any of the content.
It is all about the transparency isn't it? People today are aware of marketing techniques like astroturfing, and are right to be skeptical. How and why does anonymous guy on the internet get hold of a $10,000 printer not yet on sale in order to write a glowing "review", in which there is no mention of actally using the machine in person? For all anyone knows, the author could well be an employee of the marketing dept.
But the article linked is misleading, a quick search shows who you are and who you work for. It would have helped if that info was in the open.
Even so, I think people are aware of how magazine reviews work. The reviewer writes nice things about the company product, so the magazine gets advertising and more products to review. Does that make the review false? Not necessarily, but there is clearly a bias there which people nowadays are wise to.
As for comparing the $10,000 custom designed printer versus the Rapman 3.1 commercialized hobby printer, it is perhaps not suprising that the expensive one wins. Especially if you did not have to pay for it
Clearly, this machine is designed for pro users not hobbyists, so $300/kg is quite a reasonable price. My company pays double that price per piece to get samples of custom moulded parts made. In fact, my colleague who orders the parts asked me if I could print samples "for free" on my Rapman, but I declined
-------------------------------------------------------
> I am the author and Stratasys did not write, edit
> or direct any of the content.
It is all about the transparency isn't it? People today are aware of marketing techniques like astroturfing, and are right to be skeptical. How and why does anonymous guy on the internet get hold of a $10,000 printer not yet on sale in order to write a glowing "review", in which there is no mention of actally using the machine in person? For all anyone knows, the author could well be an employee of the marketing dept.
But the article linked is misleading, a quick search shows who you are and who you work for. It would have helped if that info was in the open.
Even so, I think people are aware of how magazine reviews work. The reviewer writes nice things about the company product, so the magazine gets advertising and more products to review. Does that make the review false? Not necessarily, but there is clearly a bias there which people nowadays are wise to.
As for comparing the $10,000 custom designed printer versus the Rapman 3.1 commercialized hobby printer, it is perhaps not suprising that the expensive one wins. Especially if you did not have to pay for it
Clearly, this machine is designed for pro users not hobbyists, so $300/kg is quite a reasonable price. My company pays double that price per piece to get samples of custom moulded parts made. In fact, my colleague who orders the parts asked me if I could print samples "for free" on my Rapman, but I declined
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Re: Stratasys's mojo : throw-away hotends May 27, 2012 01:08AM |
Here are some pictures of the innards of the mojo, and in particular, the disposable print head. Courtesy of Bertho Boman, who took them at the Rapid 3D trade show in Atlanta, GA. Thanks Bertho!
This is what he had to say about it:
This is what he had to say about it:
Quote
Bertho Boman
Following the usual trend, “low-cost” printer and custom ink, this model has taken it a step further: A cartridge filament system interlocked with a throw-away print head. The design makes it convenient though, just drop in a cartridge and snap a head in place and go.
As can be seen in the first picture, there is a filament cartridge on each side and two blue print heads in the center. There is a sample head the left side. The heads just snap in place like loading an inkjet cartridge.
The strange black boxes at the rear corners triggered several questions in previous posts. They are simple mechanical retainers to keep the feeder tubes in place. There is a little blue ring on the tubes that snaps in place and it just locks it in position. I asked the design engineer and was told it is a prototype and they will simplify it. The whole top of the machine is actually a 3D print for the prototype.
The inside of the machine can be seen in the second picture. It has a usual heated build chamber. Note the big blower in the back with a wide horizontal slot near the top. The two white rectangular objects in the top center are the print head tips. They have what appears to be a silicone rubber cover.
The most intriguing part to me is the head design. It is extremely small!! Besides the thermal heater function it also has the drive circuit inside that small case. I managed to get an opportunity to look inside it. It is very nicely made, considering it is a throw away item.
· The filament is non-standard size: 1.3mm
· The drive motor is a low-cost brushed DC motor with what appears to be a simple magnetic encoder
· The motor is geared down with a worm-gear.
· The heater with the thermocouple is extremely small, about 6mm in diameter.
· There is a small PCB with an IC on it and a few extra components. Presumably it is the interface for the thermocouple, the shaft encoder, and I would guess an internal serial number to prevent reuse if someone manage to find filament that would fit.
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