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Stratasys Reveals its Mojo 3D Printer

Mojo 3D Printer Under Wraps

Stratasys' new Mojo 3D printer was kept under wraps before being announced.

It was like an episode of Mission Impossible.

On April 11, about a dozen journalists, myself included, were instructed to fly into Minneapolis St. Paul International Airport. There we would meet a driver who would transport us to Stratasys’ headquarters in Eden Prairie, MN. We didn’t know why, and we were sworn to secrecy … until now.

The cat was let out of the bag in a conference room in the lower level of Stratasys’ main office. That cat’s name is Mojo. It’s a $9,900 professional grade 3D-printing system. By “system,” I mean it breaks the $10,000 barrier even when purchased as part of the Mojo 3D Print Pack, which includes the printer, material, support material, and support-removal system. Stratasys calls it the lowest-priced professional-grade 3D-printing system on the market, but if that’s still too much for you the company offers a leasing option with payments as low as $185 a month.

The “bag” was a white plastic cover that hid the 3D printer and the laptop it was connected to. There was no Ethernet cable sticking out from the cover because the Mojo is not a network printer. It connects to a host computer via USB, much like an inkjet printer. Files can be processed on other computers using Stratasys’ Print Wizard software, and then sent to the Mojo-connected computer for printing.

Mojo uses Stratasys’ Fused Deposition Modeling (FDM) technology, just like the company’s uPrint and Dimenson 3D printers, as well as its Fortus 3D production systems. So it’s a lower-cost 3D printer built for professional use. That’s news to be sure, but why all the cloak and dagger? Turns out there was more to Mojo.

In addition to the price, the other big reveal was the ease of use. CEO Scott Crump was inspired to invent FDM by watching ink plotters and wondering what would happen if they were extruding molten plastic, not ink. Now Mojo has taken a cue from inkjet printers with what Stratasys calls a QuickPack Print Engine. The print engine and material are all in one package. You simply drop the model material and support material packs in, snap in the print heads like you would on an inkjet printer, and you’re ready to go.

Stratasys Mojo 3D Printer in use by an engineer.

The Stratasys Mojo 3D printer and WaveWash 55 Support Cleaning System (right) are small enough to sit comfortably on a large office desk.

Mojo keeps it simple by taking a potential maintenance variable — the print head — out of the equation. The print head is simply replaced and recycled every time new material is added.

That material is Stratasys’ ABSplus thermoplastic. The Mojo prints it, and only it, in ivory. For the price, that’s not surprising. For about $10,000 more, customers who need multiple colors can step up to the uPrint SE Plus line of 3D printers.

More Secrets Revealed

After a recap of the company history by Crump, an overview of the market by John Cobb, vice president of Global Marketing, a demonstration by Mary Stanley, 3D Printing Product Manager, and a factory tour, we got down to brass tacks.

We discovered Todd Grimm, president of TA Grimm & Associates, was given a mission of his own. In my mind, Stratasys had locked him in a room with a Mojo. The only way out was to use it to 3D print his own key. OK, my mind might have wondered a bit there. Here’s how Grimm tells it:

Mojo 3D Print Pack Specifications

  • Cost: less than $10,000 for the printer, WaveWash 55 support-removal system, software and start-up materials.
  • Size: 25x18x21 in.
  • Weight: 50 lbs.
  • Build size: 5x5x5 in.
  • Layer thickness: .007 in.
  • Model material: ABSplus in ivory.
  • Support Material: SR-30 soluble
  • Workstation compatibility:
    Windows XP/7

“I spent two days with the machine. I was literally dropped off in an office with a box. I was unsupervised, unguided, unmonitored, and no instruction was given. I was told here it is, do with it what you want. Treat it like as if you’re a brand new user who just bought this system.”

Grimm put the printer through its paces, from unboxing to documentation to printing benchmark parts and judging its quality.

Here are his findings:

  • In 30 minutes, he was ready to print. He had the printer unpacked, the material and support material loaded, the modeling base inserted and the software installed.
  • It took him about 15 minutes to read the documentation and process the part, that includes 49 seconds to bring the part into Print Wizard, and then set the support structure and orientation to be ready to print.
  • No manual calibration of the 3D printer is needed.
  • The included Print Wizard software scales parts automatically if they are too large for the build envelope. It also automatically expands print jobs as needed to print multiple models, and processes all jobs with one mouse click.
  • The Control Panel, which resides on the host computer and not the 3D printer, requires no instructions. It shows the amount of support and model material in the machine, as well as the estimated print time.
  • It took Grimm 2 minutes and 37 seconds to boot up the printer from a powered off state and 10 minutes for Mojo to begin building a part.
  • Printing was a quiet “non-event.”
  • The build quality, at a layer resolution of .007, rivals that of the uPrint, Dimension and Fortus, according to Grimm.
  • For simplicity, Mojo uses only a solid fill style, Grimm said. That means no honeycomb structure is used inside “solid” parts like other 3D printers use to reduce material use and build time.
  • The WaveWash 55 Support Cleaning System (which bares a passing resemblance to a designer coffee pot) requires no plumbing as it heats and agitates the part to remove the soluble support material. It took about two hours to dissolve all the supports on Grimm’s benchmark part.

Grimm’s final verdict?

Mojo 3D Printer cartridge

The Mojo's QuickPack print engine consists of a material spool with an attached print head.

“Mojo is an exceptionally priced package,” Grimm said. “The $9,900 for everything included is impressive. The only thing that caused me to stop and ask, did I like it, is the 5x5x5 in. build envelope.”

According to Stratasys’ Stanley, 80% of 3D printed parts fall within that size of a build envelope. The company had end users — including its RedEye digital manufacturing service customers — independently surveyed to come up with that data.

During his presentation, Grimm said he accepts that conclusion. He expects Mojo to increase marketshare for Stratasys.

The size of that market is impressive. According to Cobb, there are 5 to 7 million commercial engineering CAD seats, more than 7 million educational CAD users and more than 6 million CAD users in architecture, engineering and construction.

Compare those numbers with the number of professional 3D printers sold — around 50,000 — and it’s easy to see why Stratasys is focusing on the professional market. That’s not to say it won’t sell to the hobbyist/maker market, but Cobb says Stratasys has no plans to target Mojo marketing to anyone other than professional CAD users.

Top Secret Kept

During the demonstration in April, the yet-to-be-announced Stratasys-Objet merger news was on a need-to-know basis. There were some rumors about Objet looking for a buyer, and HP was even mentioned. But Rapid Ready Tech chose not to report on the rumor.

Speaking of HP, the company does sell a DesignJet 3D branded version Stratasys’ uPrint, but the distribution agreement will not include Mojo.

“It will be launched as a worldwide Stratasys product only,” said Cobb. “The two companies will continue to work together. HP will continue to sell their DesignJet 3D Printer (built by Stratasys) in the eight European countries as they have previously.”

It sounds to me like the idea was broached, as Cobb said there were some features that HP wanted in a product that were not available in the Mojo “at the time of launch.”

When the HP-Stratasys distribution agreement was first announced, many industry watchers thought it might be the boost 3D printers needed to really break into mainstream offices. Thanks to its low price and ease of use, I think many may make that same prediction about Stratasys’ Mojo.

Stratasys Mojo 3D Print Pack

The Stratasys Mojo 3D Print Pack includes the Mojo printer, Print Wizard pre-processing software, WaveWash 55 support removal system and a start-up supply of materials. The Mojo 3D Print Pack costs $9,900.

View a video introducing Mojo here.

 

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About Jamie Gooch

Jamie Gooch is managing editor of Desktop Engineering.

5 comments

  1. What about the cost of materials? How much for a cubic inch of the ivory ABS, or the support material? Why don’t you mention that, when touting the low cost of the machine itself? How much do those printheads cost, that have to be replaced frequently, along with the materials cartridges?

    • Hi Andrew,

      Good questions. Thanks for asking.

      According to Stratasys, the cost of the material is just under $5 per cubic inch. Each print pack print head has 80 cubic inches of material. That’s $399 per print pack print head. The company says that’s about the same cubic inch cost as their other products, so there is no markup for having the integrated print head. By “integrated,” I mean the print heads are part of the print packs (you can see them in the picture above), so when you buy a new print pack of material, a new print head is included because it’s actually part of the material pack. In Stratasys’ view, that gets rid of any maintenance concerns for the print head since they’re being replaced automatically each time you add a new material pack.

      Some other bits and pieces related to material: The software won’t let you start a job if you don’t have enough material to finish it. You can swap out print packs between (not during) jobs.

      Hope that helps.

  2. If it’s just under $5 per cubic inch, it’s significantly more expensive than sending that part off to shapeways.

    http://www.shapeways.com/materials

    It’s a double whammy if you need instant builds, because you will have to pay more upfront and for the material. It’s a significant improvement, but that material cost is not ok. I really don’t think going the ink route is a good plan for 3D printers. Charge a lower price for the printer, and a higher price for the material… not a good way to go in my opinion.

    • Just a note, shapeways lists it’s prices in cubic centimeters, and 1 cubic inch is a little over 16 cubic centimeters, so even their lowest priced material, sandstone at $0.75/cc is about $12.30/cubic inch. Their ABS is $1.40/cc or just under $23/cubic inch.

      No need to spread FUD.

  3. Thanks JRK. Your answer adds a lot in my decision to purchase the Mojo!

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