How big could you print a flame fractal so far, if you have done so? I read a lot of comments of people saying that it's not possible to go beyond a certain size limit, but what is/was this limit for you?

I heard of some solutions where people just display these images as big as they can in UF (about 2000 pixels in one of the dimensions) and then export the image and it works better than using the render to disk option. But still, I think its print size is not bigger than an A4 size or something closer.

I was able to get an image of 40cm width (using the export image), at 150 dpi (single layer), but I've resampled it to 300dpi keeping the same print size just in case. For "blurred" images, I think that the resampling doesn't add artifacts to the image, but for images with details it can be a problem.

This same setting didnt work on another image (also single layer) though.

The only I know, that it is not possible to render Flame Fractals from UltraFractal. Visit the following URL: http://www.ultrafractal.com/answers.html

It is. I've done so many times (including a 42cm X 30cm image at 150dpi of "Woosh"), but they can't be rendered as big as other images. I just want to know what are the best "rates" people are getting with that.

If you want large flame fractals (eg. >2000 pixels wide) then you won't be able to render them to disk. If you have enough memory on your PC, and the fractal concerned is single-layer then you should be able to produce a large version in UF itself and then export the image - I have 256Mb of RAM and have done this with a 3 layer image at 4000*3000, though it wasn't a flame fractal. If you want to try this you need to change UF's maximum allowable internal rendering size in the options.

The limit so far seems to be 2000-2500 pixels (at 300dpi). And it can vary depending on the kind of flame, I could render images using a certain setting and this same setting didn't work for other flames (with the same number of layers). I'm rendering all the flames at 150 dpi then if possible I'm resampling them in Photoshop to enlarge them a little more. For "blurred" images, it's possible to resample them without changing them too much or adding extra artifacts. I have 512Mb and the memory goes to 0 when rendering flames very often.

When printing "One Ring and the Eye" at 50x25 cm, I had to export the flame separately by "hand". If you're unable to export at the desired size, you can always resample, within moderation, and get very good results. A good tip for that is to resize many times by small increments (I use about 5% increments) until you reach the desired size. It can make a huge difference.

I've used this trick too. Instead of a major resample from 72 dpi to 300, I first resampled it to 100 then 150 then 200 which was acceptable. Depending on the image I could go even further. Rendering the images in pieces (I tried up to 6 parts) caused me some troubles too, some images refused to render even in parts.