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I've been having this really odd problem lately and haven't seen anything like it before and am getting very frustrated. It might just be a simple fix, but I've been animating water flowing through and every time I save the file to render it later, it just ruins itself. I check the save multiple times and everything is fine but when I close blender and come back later it's just messed up and I don't know how to fix it. The domain box become visible like the pipe, it also become very small and the animation I had for the water is gone. I've tried also to re-bake everything but with no luck found. I would attach the blender file but honestly don't know how, so here's a screenshot instead. Here's what I see upon opening the saved Blender file

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  • $\begingroup$ You should probably set up a proper location for the baked cache, withing your project folder with a relative path, so that the fluid data is correctly saved and available next time you open your project file. It may get deleted in the temp folder. Use the path box visible in your screenshot. $\endgroup$ – Duarte Farrajota Ramos Feb 18 '17 at 3:28
  • $\begingroup$ Really sorry that I'm new to this and if I seem to be an annoyance, but I'm having trouble following. I found the temp file for cache_fluid, what do I do next? $\endgroup$ – ketchupboy2002 Feb 18 '17 at 4:49
  • $\begingroup$ Look at your screenshot, open yuor Blender file and press the button with the folder icon visible in this screenshot. There set up a cache folder next to the place you saved your blend file in. After that you may optionally move the files you found, or just bake again. $\endgroup$ – Duarte Farrajota Ramos Feb 18 '17 at 4:55
  • $\begingroup$ Sorry to get back with you so late, just wanted to tell you that it did indeed work, thank you! $\endgroup$ – ketchupboy2002 Feb 19 '17 at 5:43
  • $\begingroup$ Sure, done, posted below. $\endgroup$ – Duarte Farrajota Ramos Feb 19 '17 at 14:41
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You probably need to set up a proper location for the baked cache, within your project folder, preferably with a relative path, so that the fluid data is correctly saved in a safe place, and available next time you open your project file.

It may be getting deleted in the temp folder or unintentionally lost.

Use the path box visible in your screenshot under the Properties Window > Physics > Fluid > Cache path and point it to a safe location, possibly within your current project folder, or next to the blend file.

After that optionally you may manually move the cache files from the previous temp location if you do not want to rebake, or simply just bake again to the new folder.

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