dockerfiles VS dockerfiles

So there really is is only one print server worth looking at and that is CUPS, i've been testing this docker image but there are packages for it for most distros. Getting printers to run on it can be a bit tricky, I've gotten test pages out of most of the printers in the office but am as of yet not gotten any computers to reliably talk to it yet.

Basically I am running this (https://github.com/olbat/dockerfiles/tree/master/cupsd) docker container on my Synology NAS, latest DSM 7.0 (was running on version 6 before as well with same issue), and the printer (Brother QL810W) seems to hang on jobs sent via IPP using nodeJS. It goes into a waiting to print mode that never ends but it obviously receives something as the status lights change and flash green. I know the printer does work correctly through CUPS, as I am able to print a test page via the CUPS interface as well as change the label stock etc. Here is the process I go through so far:

There isn't a readme file to speak of, but from looking at the code (https://github.com/jauderho/dockerfiles/blob/main/yt-dlp/Dockerfile), it seems like downloads should go to /downloads.