Slip casting a cup from a one part plaster mold 

Thanks for watching my video!

Dear can you tell me what are the component of the clay i am new in this

​@@BrianHarperstudio Dear brian I was wandering if you can tell me the components of the clay you are using I should be thankful if you tell me Kind regards Salem almaari

@@salemalmaari7103 Hello, thanks for watching my video. You can find the recipe here: claybucket.com/recipes/casting-slips/. The one I'm using in the video is the first one at the top of that page. Hope this helps!

Thanks so much! Glad you liked the video!

Thanks so much for watching! Glad you enjoyed it.

Thanks so much Shaun! I remember when I was just getting into ceramics and seeing new things by other artists. Very cool to see you in the same spot. I have a teaching website for my students at Claybucket.com, so you might be interested in checking out the page I made that has more information on this process: claybucket.com/3d-printed-and-slipcast-cup/. I'm doing some things now with sculptural forms with a similar process, but I need to find time to make some more videos! Anyway, glad you liked this one.

Thanks so much Nina! I really appreciate that!

Glad it was helpful!

Thanks so much, so glad you enjoyed the video! I need to photograph more of the pieces, but you can see some of them at the bottom of this page here: claybucket.com/3d-printed-and-slipcast-cup/. Thanks again for checking out my work!

@@BrianHarperstudio Just watched it all!!! I’m simply amazed. Loved the finished cups but was mesmerized by the 3D printer. Wish I could go back to art class!!!!!

Thanks so much! I appreciate that

Thanks so much! Glad you liked it!

I would also like to see how such a mold is made.

Thanks so much Rick. I appreciate your kind words. I recorded a video of making the molds, but I've just been so busy lately, I haven't had time to process them. Hopefully, I can get it posted soon!

You're welcome! Thanks for watching!

Hmmm, I'm really not sure. Do you have a different slip you could try and see if that helps? That would rule out of if there's an issue with your mold. In this video, I used the Cone 10 porcelain slip under the Dylan Beck recipes here: claybucket.com/recipes/casting-slips/ Hope this helps!

So glad you enjoyed the video. I've never tried to stamp the forms when they come out, but I think it would work if you use your other hand to brace or support the form. Also, the lower part of the form will be a little wetter, so you should be able to use most stamps, especially if they are smaller. Hope this helps!

So glad you like it! The way most people glaze the bottom of an object in a kiln is by using little stilts like these: www.theceramicshop.com/store/category/9/29/Star-Stilt/. They work better at lower temps and I wouldn't recommend using them at any temperature higher than cone 6. Another option is to use a stain like iron oxide. That will add color to bottom of the object and as long as it's not applied to thick (and you wipe it off gently) it shouldn't stick to the shelf. Hope this helps!

Hmm, I've never heard of that. I would be concerned about the moisture turning to steam and either cracking or exploding the mold. Putting in the sun, or a dry box will certainly speed up the process of drying, though. Thanks for watching the video!

Hi Vladislav, I cast these plaster molds directly off the 3D prints, so I think it should be fine as long as your print is smooth and you put some mold release on it. I use Murphy's oil soap as a release. I put a few very thin coats and let it dry in between each coat. You can also sand and paint the 3D print and that can help release from the plaster (still using a release agent like Murphy's). I have more images and a walkthrough of the process here: claybucket.com/3d-printed-and-slipcast-cup/. Hope this helps!

@@BrianHarperstudio Thank you for the reply! I tried it today and it went pretty well. We don't have Murphy's oil soap here in Italy so I'll probably need to find an alternative. For now, I used a normal soap, and looks like it's working.

@@VG_ST_D Oh that's great to hear! I think if the 3D print is fine enough, you wouldn't need much of a release at all. That's good to hear the soap you have available is working well. I didn't realize you were in Italy when I mentioned Murphy's!

@@VG_ST_D... in case you see this, months later, you can also use a thin coat of petroleum-jelly (vasoline) as a release agent. Not all soaps have the "oomph" to create a barrier. Good luck!

I'm not sure exactly. It requires the use of equipment (like kilns) that are expensive and vary significantly across brands, size, and age. Most of the supplies are able to be purchased pre-mixed, so for example, you could buy pre-mixed slip, pre-mixed glazes, etc. I work within a university setting, so those costs are absorbed among the thousands of pounds of the materials and supplies we buy each year. Sorry I don't have a better answer!

Hi Celia, thanks for checking out this video. This is just porcelain casting slip. It's the first cone 10 recipe on this page: claybucket.com/recipes/casting-slips/. So, it's not a different colors, it just looks a little grey as it's drying. It fires white though. Hope this helps! Let me know if you have any other questions.

Thanks for your comment. The recipe I used in this video can be found at claybucket.com/recipes/casting-slips/. Hope that helps!

Hahaha, that's great! Thanks for watching!

Hi Magda, apologies for the delay in getting back to you! Anyway, you can certainly pour different colors in and make layers. I've never personally done it, but know others who have. I would try waiting just long enough so that the first color isn't so wet that it would mix into the second color - I'm guessing that wouldn't be more than 5 or 10 minutes after the wet slip is poured out, but again, that's just a guess. Hope this helps!

Hi Joel, I have information on the slips I've been using here: claybucket.com/recipes/casting-slips/. Hope this helps!

Hello Ka Ka, the material I'm pouring in this video is porcelain slip casting clay. You can find the recipe and instructions on how to mix it here: claybucket.com/recipes/casting-slips/ On that page, I'm using the cone 10 version of the recipe at the top of the page. Hope this helps!

I'm not sure what the shrinkage rate on this casting slip, but most casting slips will shrink more than a normal clay body. I would expect casting slip to shrink at 15% or more.

@@BrianHarperstudio Thank you! That's a very helpful info

Hi Tiffy, the cup is made with slip cast porcelain - that liquid I'm pouring into the molds is porcelain clay slip and the plaster mold absorbs some of the water and therefore hardens the cup enough to be able to remove it from the mold. Then, when it's glazed and fired, it is food safe! There are a few examples of the finished cups at the bottom of this page: claybucket.com/3d-printed-and-slipcast-cup/. Hope this helps. Let me know if you have any other questions!

Thanks Victor. The porcelain casting slip was made using the recipe on this page. claybucket.com/recipes/casting-slips/ It's the "Cone 10" porcelain recipe near the top. Hope this helps!

@@BrianHarperstudio thanks !!! :)

@@victorcontreras8070 No problem! Hope it helped.

Hi DB, are you talking about pouring plaster into the mold? You can make plaster positives from a plaster mold, but you need to make sure you have a good enough coating of a release agent inside the mold (or the plaster will get stuck inside the mold). You wouldn't be able to use the same batch because by the time the mold plaster was hard enough to remove the object that was being molded, the rest of the plaster batch would also be hard. Hope that helps!

@@BrianHarperstudio Very new to this and going to try a few projects soon. Thanks for the reply

Hi Robert, the best resource to use is the plaster calculator here: plaster.glazy.org/. Just enter your dimensions and it'll tell you how much plaster and water to use. It'll show you several ratios, but I use Keith Simpson's ratio. The ratios only show up after you enter dimensions, so if you're just curious at first, just enter some dimensions and the page will display the ratios. Hope this helps!

@@BrianHarperstudio Thanks Brian i appréciate

Hi Ibrahem, the white material that the mold is made out of is No. 1 Pottery Plaster and the grayish liquid is porcelain casting slip. Hope this helps!

The material is porcelain slip made for slio-casting. Hope this helps!

The casting slip recipe and instructions on how to make it are here: claybucket.com/recipes/casting-slips/

😂

So glad you liked the video!

Thanks for the feedback rand95060b8797823f9832h4f7h329f8! Your videos must be perfect. I'll have to check them out someday. I'm "sort of" sending big hugs you have an amazing day!