Slip casting a cup from a one part plaster mold

In this video, I demonstrate how to slip cast a one part cup mold. This is part of a project for IU Southeast Ceramics where we are learning how to 3D print cups and cast them in porcelain. You can find out more about that project at claybucket.com/3d-printed-and...

[@stephencraig7130]

Nice video. I've been doing this for 50 years! I'm 62 now, and I'm still going! It only gets better. Too bad that this art is slowly fading away. Folks may dabble, but it's Nothing like it was back in the 70s! This is very educational!

[@BrianHarperstudio]

Thanks for watching my video!

[@salemalmaari7103]

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

[@salemalmaari7103]

​@@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

[@BrianHarperstudio]

@@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!

[@violentvinyl]

This was a great overview of the process, so thank you for sharing! I watched a few other videos on slipcasting and I saw a video where they had added a "sacrificial rim" of sorts to the mold. It meant that when the slip was poured out and the top was trimmed, there wasn't a thicker rim left behind and the exposed top of the casting was more uniform with the rest of the mold. You've probably figured this out by now but I thought I'd mention it!

[@AntoinetteStryk]

Some really good clear advice, thank you.

[@BrianHarperstudio]

Thanks so much! Glad you liked the video!

[@shaunhall960]

I'm just getting into ceramics and this is soooo cool!

[@BrianHarperstudio]

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.

[@Alyssaficational]

Great, easy to follow explainer vid. Thank you!

[@BrianHarperstudio]

Thanks so much for watching! Glad you enjoyed it.

[@bazraga4669]

Thank you indeed. This video is one of the most import reverence shows all tips..thanks 😊 🙏

[@BrianHarperstudio]

Glad it was helpful!

[@markinpdx7345]

Great video Sir, thank you!

[@ninamaria3216]

This was extremely informative! Thank you so much for this video. Subscribed :)

[@BrianHarperstudio]

Thanks so much Nina! I really appreciate that!

[@jsud5559]

Wonderful demonstration! I’d love to see the finished product. Thank you so much.

[@BrianHarperstudio]

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!

[@jsud5559]

@@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!!!!!

[@logikami]

thank you for this information. subscribed.

[@Chinmayeesvlogs]

Awesome explanation ❤️

[@BrianHarperstudio]

Thanks so much! Glad you liked it!

[@markinpdx7345]

Very helpful, thank you.

[@marcolin2249]

best teacher!

[@BrianHarperstudio]

Thanks so much! I appreciate that

[@Felix199393]

Wtf this is the first time I ever saw this technique and it's so beautiful. Bro I am so glad I saw this video. As soon as I'm back on my desk I'mma drop some stuff into fusion immediately. If I'm satisfied with my models I'll drop a Thingiverse link on your channel

[@Deckardrick007]

This was very informative, thank you! Do you by any chance have a video on how to make the actual molds?

[@MrsKrolik111]

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

[@BrianHarperstudio]

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!

[@Syntheonline]

NIIIICCCCCCCCCCCEEE!

[@tksmith3698]

Thank you

[@BrianHarperstudio]

You're welcome! Thanks for watching!

[@pastelskies8466]

Great tutorial. How can I make a mold from my favorite mug without breaking it?

[@isabelavelasco3333]

Nice video Brian! Ive been having trouble with slip casting recently. Some objects are having small cracks at the inside bottom! Cracks are small and mostly visibly when objects are already bisque. Any Idea what can cause the cracks?? Thanks!

[@BrianHarperstudio]

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!

[@bahardt]

Thank you, very informative. One question; can i use stamp on the product that fresh out from the mold? or it is too dry to stamping?

[@BrianHarperstudio]

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!

[@abeeradm7476]

Perfect 👌 I like it But I want to ask you a question I did a ceramic tray of white clay and I want to glaze the bottom but I am warry about stocking in the kiln especially there is no legs so how can I colour the base?

[@BrianHarperstudio]

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!

[@NaveedAhmed-Ni]

What is the name of this soil and what chemicals are added to it please Guide me Dear

[@kx4532]

I have a mug that narrows a bit at the top. How did they make it?

[@valanso45]

If I use cement liquid instead will it come out from plaster mold?

[@celiagreenaway725]

There appears to be 2 different coloured plasters on your moulds - white inner and something grey on the outside. What is that please? Very clear casting video, thank you.

[@BrianHarperstudio]

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.

[@joelcordier6762]

Thanks for making us discover that nice activity. I think there is a problem with your 3D printer as you seem to have the same artefacts at the same height on both items. It's probably related to the Z axis.

[@iwovbue]

Do you have a video of how to make the casting plaster molds??

[@spacejam242000]

Thank you! Love the shape. Can you make a video showing how to make a plaster slip cast mold for a mug?

[@VG_ST_D]

Very nice and clear video! Maybe I'll try this technic later! I'm currently working on a project where I need to do some parts in plaster and I was wondering if I can directly 3d print my mold and cast the plaster inside or maybe I should do it differently? Any suggestions?

[@BrianHarperstudio]

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!

[@VG_ST_D]

@@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.

[@BrianHarperstudio]

@@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!

[@alchemyarts3490]

@@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!

[@samanthanicholson9015]

Do you have a video on the mold? Do you sell them?

[@florianbertram9451]

lovely video, thank you! Can the moulds dry in a microwave or would that destroy the mould?

[@BrianHarperstudio]

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!

[@paradawilsonartes]

Nice mais um inscrito

[@magdacabezas1779]

Can this slip be colored?? How long would you leave the slip to dry if you would like to make several layers of different colors. Want to try some carrying afterwards.

[@BrianHarperstudio]

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!

[@amania9254]

👍

[@sparc5]

I have no interest in ever slip casting, but I just spent 20 mins captivated by this video.

[@BrianHarperstudio]

Hahaha, that's great! Thanks for watching!

[@joelrobles9143]

what kind of clay and ingredients did you use to prepare the slip clay??tnx just interested

[@BrianHarperstudio]

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

[@Abdirahman_097]

Pleaze dear ,tell me the compenents of the product

[@Good_Things_To_Know]

Good morning, How much would a jar like this one cost to make? From start to finish. Meaning that it could stand hot and cold Temps.

[@BrianHarperstudio]

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!

[@PRMOVIES196]

Nice video sir. How do you make this slip clay / liquid clay? Sir Please make a video

[@BrianHarperstudio]

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

[@KaKa-id4re]

What substance are you pouring it with?

[@BrianHarperstudio]

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!

[@astronlikardi]

☺️

[@victorcontreras8070]

what proportions used in mixing the porcelain powder with water? nice video

[@BrianHarperstudio]

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!

[@victorcontreras8070]

@@BrianHarperstudio thanks !!! :)

[@BrianHarperstudio]

@@victorcontreras8070 No problem! Hope it helped.

[@user-oe7vq8jz7v]

مرحبا .... شكرا على الفيديو الرائع .... ممكن بعد اذنك تكتب اسماء المواد الخام المستخدمة في صناعة الطين المائي

[@BrianHarperstudio]

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

[@db2378]

could I use the mold mix and pour it back into the actual mold ? could that work

[@BrianHarperstudio]

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!

[@db2378]

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

[@TiffyBeSoRandom]

If you don't mind me asking what's the point of creating a mug or cup made of plaster if it's not food safe?

[@BrianHarperstudio]

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!

[@robertdumoulin4612]

What is the ratio plaster water for a proper mix.Thank you

[@BrianHarperstudio]

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!

[@robertdumoulin4612]

@@BrianHarperstudio Thanks Brian i appréciate

[@Abdirahman_097]

Can you tell me the compenents of the product?

[@BrianHarperstudio]

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

[@ibrahemeldsoky6139]

What is the material used

[@BrianHarperstudio]

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!

[@rabahabusalha2700]

اسلام عليكم ما اسم المواد

[@micheledickey4066]

Mixing too vigorously right before pouring will leave air bubbles in the slip. Always allow the slip to sit and bump the sides over and over ti force the bubbles to the top, then stir with a big spoon.

[@kevinjamiesonbelou]

Take a shot every time he says "um"

[@BrianHarperstudio]

😂

[@TheUser986]

Umm, umm, umm!!!!! Ugh

[@BrianHarperstudio]

So glad you liked the video!

[@rand95060b]

Must have said "Ummm" about 200 times. Sort of stupid sounding.

[@BrianHarperstudio]

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!