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@Batman
Middleburn make a 110bcd road double but my bikes 1x10 and the spider is £70 (with shipping) which is mental. The aluminium stock cost me £40 overnight shipping and I don’t pay for machine time so ostensibly i did it because it’s cheaper. Beige answer is I like to make stuff and in this case the spider was a perfect excuse to do that. Also I only had to model the spline profile and chainring holes and the computer filled in the gaps. My mate has to figure out all the tool paths and deal with bullshit nuance of his machine which is most of the effort but also good practice, so everyone’s a winner. @Skülly
Edit: something else I forgot to mention is that cnc machining the first one of something is a much longer process than any subsequent parts. Once you know that your code is good you can run multiples at the same time and churn them out.