So who is thinking about the Mark One…???
Originally shared by Ryan Matthews
MARKFORG3D Mark One Carbon Fiber 3D printer goes on pre-order today starting at $5k!!
https://markforged.com/mark-one/
#3dprinting
#3dprinter
Material costs: https://markforged.com/mark-one/the-materials/
$550/lb. Totally bonkers.
@Tim_Elmore1 Um, yeah…
I also don’t understand how they get cross-layer bonding of the fibers.
@Shachar_Weis run the fill paths of adjacent layers perpendicular to each other. layer 1: east/west. layer 2: north/south. Assuming that the majority of the fiber length and strength will be oriented with the extrusion path, running perpendicular fills on adjacent layers would at least give you fiber strength in two axes.
We also don’t know whether the filament is composed of chopped fiber in mostly random orientation within the thermoplastic filament or if the filament is actually a continuous fiber encased in thermoplastic. Chopped fiber would provide some improvement to strength over plastic alone. Continuous fiber would provide incredible strength.
Chopped fiber doesn’t increase strength, only stiffness:
https://www.kickstarter.com/projects/1375236253/proto-pasta-gourmet-food-for-your-3d-printer
In fact, strength decreased slightly.
Continuous fiber might help, but only in the XY plane, which is already the strongest direction of FDM prints.
i dont see any article in the website that proves it is stronger. so ima have to say its cosmetic lol
@Tim_Elmore1 , I don’t think it’s possible to have continuous fiber, they’d have to cut the filament/fiber any time the hot end traveled
@Eric_Moy From their FAQ: “The Mark One uses a new 3D printing process we refer to as CFF™ (Composite Filament Fabrication™) in combination with traditional FFF. Parts made with CFF™ are reinforced by continuous strands of fibers embedded in a thermoplastic matrix.”
So either they’re lying, or they’ve found a way. I was just quoting their FAQ.
@Danny_Thorpe you need diagonal layers to. Or your may as well use spun glass.
Still they need to cut it between layers unless its a really thin fibre.
Actuated razor blade at the tip of the extruder should do the trick. ;>
He said stands of carbon fiber in the video. So they could just be short stands with a polymer. Also they show bending the part, but they don’t put any effort into bending it. Also no tall parts?
nah i dont buy it, if they really made this to compete with normal carbon fibre production parts, they should at least have a tensile/destructive demo to give people an idea how strong is the “strong” they are talking about in reality. if any one buys this, they are really paying for strength, otherwise, why buy it … am i right?
@Tim_Elmore1 , it could be continuous flow of small strands oriented in the same direction possibly. Unless they did snip it before every travel. Either way, strength would be completely relying on orientation which would be determined by the slicer.
@Eric_Moy on there web page it shows one direction flow and then its encased in another polymer of some sort. I think its just a marketing ploy. As you wouldn’t need anything else to be added to it if this idea had any merit.
@Shachar_Weis They really don’t. One direction is likely just as weak as most 3D printed parts because of the adhesion limitations between layers.
I’ve gone on big rants about fiber reinforced 3D printer filaments in the past. Not going to do it now, but the “Anatomy of a Continuous Filament Fabrication™ Part” section shows a really stupid application. They are purely compressing carbon fiber layers. That application does not apply any bending or tensile stress to the fibers, nor does it stress the interface between layers. So basically it’s an expensive spacer plate.
And anyone who wants to really understand how to effectively use composite materials should educate themselves with : http://www.amazon.com/Analysis-Performance-Composites-Bhagwan-Agarwal/dp/0471268917
If you understand some of the more basic principles in that book then you quickly begin to realize that current 3D printing methods are not effective ways to manufacture composite parts.
What 3D printing is great for is printing out a prototype that you can produce molds from or in some cases 3D print the mold directly. Once you have a mold then you can make composite parts that are worth your time and effort.