I have just printed a draft of Joe-C's revised Ex series lens block housing with the extended focus ring. I increased the diameter of the assembly by a factor of +1.06 and printed in inverted to avoid the need for support material. It printed very well with a 0.2mm layer height and standard print quality. The fine threads are well defined and fit for purpose.
The printed part now has a thread major diameter of 13.90mm. THis is compared to the FLIR OEM part loose fitting thread major diameter of 13.65mm. The larger diameter thread is a little tight for my liking so I will need to determine a happy medium between the two diameters to provide a nice smooth, but slightly firm thread movement. The Loose FLIR thread is way too sloppy for daily use. For those interested, the metal threaded hole into which the lens housing screws has a minor thread diameter of 12.90mm.
For an ISO 6g M14 x 1 Bolt, the following thread Major and Minor diameters apply:
Major 13.974mm Max to 13.794mm Min
Minor 12.891mm Max to 12.590mm Min
For an ISO 6H M14 x 1 Nut, the following thread Minor and Major diameters apply:
Minor 12.917mm Min to 13.153mm Max
Major 14.000mm Min to 14.304mm Max
My latest printed thread had the following dimensions
Major = 13.90mm = Just within tolerances
Minor = 13.01mm = Outside tolerance and too large a diameter
Fraser