Thanks for your help. Unfortunately because I'm trying to create functional prototypes, it is important to me that I use a CPE material. Colorfab NGEN was recommended to me by the Ultimaker vender and has a good reputation. Howeve, following what you have said I have installed a brand new reel.
I have improved the fragility and wall finish by running a finer layer height. I cannot get a decent part from a 0.4 nozzle and 0.15 layer height. Printing is slow but at least I'm not getting horribly fibrous parts that fall apart.
Surface finish on a 'supported' face is still very poor and has to be heavily sanded. Any clues on how to improve this would be gratefully received.
Your printer must be a UM2+, right?
Ok. First thing first, get read of this filament, use a good known or “recommended” brand of PLA!
What you describe here is not a printer issue, -but more likely a filament issue!
In fact all of your issues point to filament property deviation. (as high water content. etc)
Make sure that there is no remains in the heat block or nozzle when using other type of thermoplastic.
At this site you will find material types recommended for Ultimaker printers:
I’m sure you will see that an UM2+ can really deliver good quality 3D prints.
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