@Brulti , @gr5 - Thank you for your replies. Perhaps the S5 was not the right machine for me to have purchased. While I appreciate all the 100+ settings that are available in Cura which can control things like fan speed and build plate temp and nozzle temp and print speeds, etc., what I really need is a plug-and-play tool. I suppose the Cura/Ultimaker combo is appropriate for those who have a good understanding of the dynamics of 3D printing and have the time to work through complications and find a solution - - or, as @gr5 has offered, relying on others' expertise and experience to walk through a solution. But this S5 was intended to get up-and-running on some prototypes which work the first time, not to be a 3D printing experiment and education tool to learn the intricacies involved. The glossy marketing materials state that the S5 can print PC--and indeed it can. What it doesn't say is that it won't successfully print PC with the default settings in Cura. If PC needs a particular fan speed and/or plate temperature to build successfully, my thought is that's something Team Ultimaker should incorporate into a release of Cura, not something simply to be left to the Ultimaker Community to figure out. Honestly, I didn't know what I was getting into. Perhaps the aluminum plate would not have made a difference with PC, but my reseller seemed convinced it would. We'll never know. I'm not wanting to rant or whine too much here, sorry if I already have. I threw away the sagging PC parts that were made months ago, so I have nothing to take photos of. If time and my patience permit, I'll print another PC part, and take you up on your offer for assistance. FWIW, it thankfully seems to print ABS just fine.