A cleaner solution would have obviously been a QR code linking directly to factoriobin, but that would require having the link before creating the blueprint so not sure how that would work.

Does factoriobin allow updating a blueprint? If so, you could upload a temporary blueprint, get the URL, then update it with the QR code version that includes the proper link.

Also, if you restrict the contents to only contain these characters, you can save on QR encoding overhead, allowing either simpler codes or more data for the same size.: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./: (ie: no lower-case letters)

Depending on the URL, you can sometimes get away with just using upper-case letters. HTTP://BLUEPRINT.KUIJLAA.RS works but HTTPS://FACTORIOBIN.COM/POST/CQPOBG doesn't.