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About prattcm

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  1. When I pour it is very similar to the picture you shared. The funnels I’m using fight tight and form an extension. They only go in the mold about 1/2 inch, so they don’t prevent the air from escaping. The hole in the bottom of the funnel matches the hole in the mold, which is rather large so is not limiting the flow into the mold. I will get a large pitcher so I can pour it more quickly and see if that solves it. Thanks!
  2. Sorry for the confusion. This is what the mold looks like closed. I have two silicone funnels I put in each hole. The slip does not drop below the mold level during casting. These lines happen during the initial filling of the mold
  3. Yeah I 3D printed the original model and made the mold myself. Picked a nice easy project to start with... anyway it’s stoneware slip and I think the shrinkage is around 11% if I remember correctly. I’ve looked and I think I should be able to find some dry mix that is close enough.
  4. I haven’t been doing this whole ceramics thing too long, but I’ve just been using it because of the simplicity. I’m sure I will mix my own before too long, but haven’t taken the leap yet.
  5. So I get this slip in 2 gallon bags premixed. I was wondering if this looks like there could be an issue with the mixture. I could try to talk to the supplier about it the next time I buy more.
  6. I have a 5 gallon bucket up on a shelf with a hose coming out of the bottom that I use. It comes out pretty slowly though. I can try a different way to fill it more quickly to see if that fixes the issue.
  7. It is molded in this orientation and the swirls form up near the hole on the left and wrap down to that side
  8. I have been slipcasting recently using premixed mayco stoneware slip. I mix it well before pouring but there are always some darker swirls that you can see at the top of the bucket. They are noticeable when I pour the pieces where the slip reaches the top of the mold and meets in the middle. I’ve had a few pieces that show minor surface cracks in this area. What is causing this and how can I prevent it?
  9. I am working on a project where I need to be able to mold the interior walls of a part. Similar to the double wall mug shown in the attached picture. I know this isn't recommended for slipcasting, but I can't come up with a better way to make it. I have only been able to find a few examples of this type of mold and I am trying to see if anyone has any guidelines or recommendations. I am able to make this part of the mold air release, if that is necessary. The interior walls of my part will be a little over 5 inches deep and about 5 inches in diameter, I know having a steep draft angle will hel
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