This is a workable glass powder that is very inexpensive and is environmentally friendly because it uses recycled glass.  It was the first glass powder tested in our lab. It has weak damp strength, OK green strength, and OK behavior  in the kiln cycle.

SPS Powdered Recycled Glass 1000 units

Powdered Sugar   ———– 250 units

Maltodextrin   ————- 250 units

If you can’t find Maltodextrin, then use Benefiber (it is no longer maltodextrin but rather a wheat dextrin).

Use either binder from this site.  Let the part dry (in the bed) overnight and bake at 175 F for one hour.  Then kiln fire to the desired crispyness.
3DP glass test bars
3DP glass test bars
This glass works very well for the 3DP process.  The only issue that I have with it is the resulting color.   The strength is fine.

13 Comments on 3DP Glass Recipe

  1. Michael says:

    Congrats on 2,000 visitors! Keep up the great work. Do you have any recommendations on where to purchase the recycled SPS? As far as kiln firing, what temperature and time are you using on most of your glass prints?

    Concerning detail, from the pictures it seems that the glass holds more detail in the final product. Is this correct and what would you say is the minimum thickness you would print an object to safely remove from the print bed?

    Thanks,
    Michael

  2. admin says:

    Michael, SPS recycle is just recycled glass from Seattle Pottery Supply. Contact your local pottery store and ask for glass powder. We’ve been firing around 1200 deg F with a hold of 10-20 minutes.

    We’ve been running glass in our 400 class machines. I’d say glass and ceramic are about the same. We’ve printed some test parts at 6 x 0.004″ layers.

  3. Tom E says:

    Great work and info you are providing! I am interested in 3D Printing of ceramics (and perhaps other materials). I have a question on your printers. You are using a Z 400 series, I believe. Does this work well for your work trying different materials? Have you had many problems with the printer? I am considering buying a used 402. Do you have any advice on this? The person selling is asking ~$14,000 for the printer, an oven, and powder removal stand, a pc and software. I am kind of shooting in the dark since I am new to this but am wondering if this will work for the purpose, if it is worth the price, what issues I should consider with a used machine?

    Thanks,
    Tom

  4. admin says:

    Tom, In our lab we have been successful in 3D printing using most models of mono-chrome 3D printers. We have several 400 series printers and several 300 series systems. Plus another vendor’s product.

    We can’t really get into pricing. Sorry.

    You just need a 3D printer, some type of depowdering system (think sandblasting box and hepa-vacuum), a convection oven and a kiln (we use 110v kilns but 220v are even better). Anything else really isn’t needed.

    Try googling “Used Engineering Machinery” or “Used Rapid Prototyping Equipment”, as there are several used equipment
    dealers that handle RP and 3DP.

  5. Tom E says:

    Thanks for the info!
    Tom

  6. admin says:

    Tom, you’re welcome. We are trying to build a community of folks experimenting and sharing successes in 3DP.

  7. Christophe says:

    Hi,

    Can you explain for those (like me ;-) ) who have skipped chemistry course at school what is the role of the maltodextrin and sugar in your recipes ?

    Thx,

    Christophe
    (Still testing wood flour and ceramic)

  8. admin says:

    Christophe,

    Sorry but I don’t think that I can explain easily from a chemistry perspective. Basically, you can think of maltodextrin and sugar as water soluble “glue”. There are MANY water soluble adhesives. We try to match adhesives with the base powders (as sometimes the glue doesn’t like the base powder). Further, we try to present the simplest system that is workable (under the idea that simple and available allows access for more people).

  9. Christophe says:

    Does maltodextrin and sugar have the same role (both soluble glue) or is it the combinaison of those two ingredients wich make soluble glue ?

    Christophe

  10. admin says:

    Christophe, The role that maltodextrin and sugar have depends on the powder base. In general, they both act as soluble glue but for some powders they may interact with the base powder. They have different wet strength properties and dry strength properties which depend on time after printing. We suggest try mixing powders with just one of them and then 3D print some test parts to experience it.

    We will try and post some more information in the form of patent information.

  11. [...] RepRap Printing in Clay — interesting because of the high price of the plastic that fab units typically use. Other groups are working on this–see, for example, recycled glass, sugar, and maltodextrin. [...]

  12. [...] a team at the University of Washington in Seattle recently developed a new material from sugar, maltodextrin, and ceramic which anyone can mix in their home for less that $2 a [...]

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