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Hi, I wrote this article. To answer your suspicions.
1) Realistically they are within an hour of each other regardless of infill so the total print time was negligible in this experiment. A few changes on both machines could make either or print much faster. 2) Yes, it was my intention to have the same layer heights and overall print settings as close to each other as I could.
I can't give you an exact reject rate but it went through at least 3 iterations before being acceptable. As for tolerances and material properties (overall strength of the part) the Stratasys machine is superior in both aspects. As I mentioned in the conclusion of the article, I would like to do more experiments on the parts including dimensional analysis and possibly a tensile or compression test. Having 1 data point (1 tool from each machine) wouldn't be the best results for an accurate comparison but I would still be interested in the results.
Hi, I wrote the article. I am really enjoying the comments everyone has contributed. One major detail I left out was the amount of failed parts that came out of the professional machine prior to getting a good one. I was unaware of the reject rate at the time I wrote this. In addition, the production tool ended up having resin added and then sanded to cover up some of the imperfections on the "professional" print.