Have you tried the “open the lid” trick? If it’s trying to download a software update sometimes that can interfere with calibration – open the lid and THEN turn the GF on. That way it can’t calibrate, and the download can finish. Give it a few minutes and then close the lid and try again.
If you’ve already been through the troubleshooting page, I remember a few oddball things from various other posts on the topic…
Any changes in the GF environment that might affect the wifi signal – one person had mounted a metal plate beside theirs, to attach their magnets to, and that was apparently enough to disrupt the wifi signal and throw the machine into eternal calibration…another piece of hardware could theoretically do the same (fan, printer, etc.).
One person found that changing the GF’s wifi channel worked – too many devices maybe trying to use the same one.
Sometimes cleaning the lenses seems to help – and the Glowforge logo on the top of the print head, since the camera uses that for location purposes.
And sometimes the ambient lighting can affect the camera’s ability to focus – could be too bright, or not bright enough.
Sorry you’re having to wait for staff…I hate it when things go wrong on weekends! But hopefully that gives you a few more things to try in the meantime.
I second @geek2nurse’s suggestion. I had the endless calibration issue recently. I turned off my wifi router and repeaters, waited and then restarted them and all was fine. No other devices had been having problems with wifi, so that don’t use them as a sign of all things being right.