3D printed waveguide - novice questions to get started

I'm slowly warming up to the idea that I may need to put my Bliesma T25Bs in waveguides. I figure I'll go with either the round 6" or 6.5" augerpro guides. They will probably be crossed over to Purifi PTT6.5Xs. I've never done any 3D printing, but I have access to some Dremel Digilab printers at work and we are encouraged to use them for personal projects. So some novice questions:
  1. What material works best for a waveguide?
  2. How do I determine how much I will need?
  3. What, if anything, will need to be done to it after it is printed to make it look good?
  4. Approximately how long will it take to print?
  5. Will I need to "check in on it" or do anything while it's printing? (I suppose, I probably will anyway)
  6. What else do I need to be aware of?
 
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1) I would use the Dremel ABS filament. ABS has long term stability, while PLA doesn't.
2) The slicer software should tell you many grams the print requires
3) Depends how pretty you want it to be. Anything from nothing, to a little high fill primer and light sanding and painting
4) 30-40 hours probably
5) You don't need to check it, but you might just to make sure the print hasn't failed in some way
6) print it face up
 
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