This error is caused because 3dm2 uses a no longer supported SSL cipher. Normally in order to fix this issue you would just issue an updated SSL cert but 3DM2 does not offer this option, so you will need to open up a legacy browser.
On windows you will need to run internet explorer
then open the local server address, https://localhost:888/
It is possible you will need to go into internet explorer > internet options > advanced and enable addition SSL protocols as well.
When adding, updating or replacing an SSL certificate you encounter the error "NET::ERR_CERTIFICATE_TRANSPARENCY_REQUIRED"
This is most common with LetsEncrypt SSL as they seem to be overutilizing resources.
The issue happens when the LetsEncrypt servers are behind on pushing transparency proof logs and google chrome caches the cert info before those logs are in place. In most cases this will resolve itself within 5 minutes or so but may require you to close the browser and reopen it or even clear the cache on the affected browser. In some cases it can take much longer and may even require a reissue of the cert.
This is an odd one and actually stumped me for a bit, in order to solve I used f12 developer tools to uncheck specific css attributes and tested the print function again. It ended up being a font-family attribute in the all css style.
Once removed the page printed all of the content on all browsers once again. I also tried adding a second font but that also did not solve the problem. It seems that the font was not being imported correctly or was corrupt. Replacing the font using the @media print solves the issue.
Edge Chromium has network-service-in-process enabled by default which can cause erratic behavior and disabling it can solve this issue.
In edge browser go to edge://flags/#network-service-in-process and disable it.
Then restart edge chromium.
Edge Chromium which is basically a "reskinned Chrome" with some minor changes you can use many of the same tools that you can for Chrome. In order to see Resource usage on Chrome or Edge Chromium you can use the Shift+esc combination to open the "Browser Task Manager".
At this point you can close any tabs that you don't need that are over using resources.