3D Printing Printed Nose Cone

Another how-to video, this time the complete process of designing, drawing and printing an upscale nose cone.
jcrocket.com/printed-nose-cone.shtml

Nice work John. At the end you talk about adjusting size to fit the coupler - do you normally define the CAD to nominal dimensions then adjust sizing in Slicer? I've been fighting with that a bit lately. I want my CAD to be "correct". I'm printing PETG on a Prusa Mk3s and a 1.37in diameter nose cone sled is coming out at 1.36", so is a sloppy fit. I've calibrated the steps/mm with both PLA and PETG, adjusted extrusion widths, extrusion multiplier, and live-Z to get layers and wall thickness to match the Slicer settings (0.2mm and 0.42mm). I have not played with a scaling factor yet as I'd rather go by the mechanical numbers first. Is this most likely just a PETG shrinkage thing?

AeroAggie said:

At the end you talk about adjusting size to fit the coupler - do you normally define the CAD to nominal dimensions then adjust sizing in Slicer?

Click to expand...

I do all adjustments in the CAD program and re-run slicing as needed. (If I come back to something later, I don't want to depend on remembering extra steps.) I start with about 0.005" under and in this case that worked out nicely. I printed this part with PLA if that makes a difference.

I know, I should just give up and do everything in millimeters. Maybe for the next project...