I have been using one for the last 2+ years. I first built Mendel i2, and got upset with it rather quickly. Then I rebuilt it into Mendel90 which is my daily pr

I have been using one for the last 2+ years. I first built Mendel i2, and got upset with it rather quickly. Then I rebuilt it into Mendel90 which is my daily printer up until this point. Many others have already pointed that out but I will re-hash it- the most time consuming point was between the time printer started to work, and time I could hit print, and come back a few hours later with the part ready. I believe it took me a few months (not fulltime, but fiddling with it in spare time). It has been an invaluable tool for me, and I really don't mind tinkering with it. I'm now building a larger, over the top FFF printer and UV-resin curing one is on my roadmap too.