Thank you Lindley for the reply.
First print went off without a glitch, except for the minor one mentioned. Second print, using a file I had on hand, started ok, but when it came time to print, nozzle temp wasn't rising. Backed out of that and tried "Refuel." That got me into a seeming loop, locked screens, and 3 or 4 reboots. Turned off, waited a few minutes, then proceeded as with the first print. Worked fine. Only 18 minutes to print this (attachment, white version, blue is injection molded version).
I assumed a more detailed manual was not available, and so I will have to find the sequence that works best for me and keep notes.
One question: Is there any way to control the texture of a large flat surface. My guess is to print it as a vertical rather than horizontal flat, as I did in that example.
As for my 3D CAD. I used Ashlar-Vellum Cobalt and SolidWorks more than 15 years ago and had a little experience with SketchUp in about 2008. I tried FreeCAD yesterday and looked at a couple of others that seem to be focused on free-form drawing, not geometric design. I am most comfortable creating geometry, extruding (etc.), edging operations(e.g., radiuses, bevels), and mating objects. I suspect Autodesk 360 free is built like that but won't run on my ancient Win7. So, I expect to end up with a laptop with Win10/11 and am waiting until the August back-to-school sales.
John
PS: I still have Cobalt on one of my PCs, but it was a nightmare compared to SolidWorks and SketchUp. However, I use its 2D version, Graphite, and export in DXF or PDF regularly for compatibility.