(The QR code scans to blueprint.kuijlaa.rs which redirects to https://factoriobin.com/post/cqpobg )
The idea came from _SilentHunter here. 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. Some in the original discussion also suggested encoding the blueprint string in the QR code itself, but I don't think that is anywhere near possible. This blueprint has 67,253 characters, containing a QR code embedding just 20.
As for the blueprint itself, It's 250x250 with a 200x200 grid, just so it tiles nicely with the roboport+power network. The blueprint itself has an accumulator/solar of 0.57, but this will tend towards 0.86 as tiles are added (due to the overlap), the 4 tiles above come to 0.69. There is also a lot of room for improvement in reducing gaps and the power grid...