I now know why they sell 3d printer kits with no electrical guts included. My delta is great at printing certain things and AWFUL at printing others. It seems like, if the base is small, and it can get past that first layer or two quickly, and there’s not a lot of retraction, I can get a useful print or two.
Attempting @Louise_Driggers ’ Dragon had four failed attempts in getting past layer 2.
I re-shimmed my gears, which cut down on the slipping while I wait for known good replacements (thanks @William_Frick !) and in attempting to print 3DR expansion parts (http://www.thingiverse.com/thing:194631) found that my Bowden motor is getting weak. I suspect the POLOLU, but wasn’t going to halt the print in process…well, that didn’t much matter.
That combined with the now commonplace ‘start print | halt print | flash new Z height | start print | halt print | adjust M666 | Start print | halt print | clean off bed and re-prep’ makes me think I’m getting awfully OCD about this stuff and perhaps I need to walk away. 
And yet I made the following rather successfully over the last few days…
