I"m considering making my own filament, with a device like the one at http://www.thingiverse.com/thing:380987. Partly because it's another machine to build, which is cool, but also to save money on filament.
Has anyone here tried to make their own filament? My main questions are:
Is the quality comparable to typical off-the-shelf filaments? Put another way, with reasonable tuning can one produce filament that's good enough to use without a lot of frustration?
Does it require a lot of attention to tuning, monitoring, or other details (which make it less worthwhile / more time-consuming)? Warning of pitfalls to avoid is also welcome.
Are there useful things one can do this way, that are hard to achieve with off-the-shelf filaments? For example, unusual materials; better control of diameter, density, etc; or mixing one's own colors?