Steve, if you are using PLA glue it with Plastruct Plasticweld - its chemically very similar to styrene and it bonds really easy.
Check out the CreawsomeMod for Cura if you are using it (currently I think 4.1 is supported, not sure about 4.2 yet?) , the fine details aren't as good as setting it up manually (the mod limits you to a minimum 0.12 layer height, I like to go down to 0.04 for really fine detail if I have large vertical surfaces to print and don't want to sand them to much after) but if you want to do large parts at a decent quality in a short amount of time its the the way to go. I cranked out a pair of (fake) rubber pontoon floats on my CR10S4 in no time at all the other week at 0.2 layer height with no issues, and those things are massive compared to what I usually print.
