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Thanks for that 7upMan. I had to try a few times to get the cat printed with black filament. (I'm slightly mad, I do repeat the same steps hoping for a different result.) The first couple (using thing 923108), it separated, ending up printing spaghetti.
Of the bird feeders I printed (that screw onto the bottom of drink bottles), the fluoro yellow was good, the black was weak and broke. -But birds won't go near the fluoro, I had to colour it black.
Yes, I need to try different settings with the black filament to get reliable prints.
All my filaments came from Hobby King, where I bought the printer at a good price. The fluoro yellow, with which I have the most success, is unbranded. The red and black (and white which I haven't tried) are esun brand.
I might post a question about it on the Google 3D printer group I'm on. Plenty of experts there.