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You have the option of doing that... That will work... You can just print 90mm rods and the two arms and it will fit every one... But I like everything lining up and being more clean looking. So I added a lot of sizes so, if you want to, you can get a perfect fit...

I also ran into the issue that if I made the base arms to large, a lot of people would not be able to print it out due to their build plate not being large enough... So I wanted to keep them small but still big enough to hold almost every spool... There's really a design/engineering trade off you need to figure out when you're dealing with these machines and their inherent constraints... I do, however, plan on making bigger arms to fit bigger spools in the near future.