Printable Custom Adapters for M48 to M42

[Dr_Ju_ju]

While rummaging around looking for adapters to mount a ZWO_ASI_533MC camera to a SW ED80 comma corrector, and even buying some some from the wonderful FLO, all appear to work ok, but the "standard" 27.5mm spacer, comprised of the supplied (camera) M42 adapter and a 16.5mm M48/M42 adapter, put the imaging sensor much closer in to the corrector, as compared to my ZWO_ASI_1600 setup, which puts the Imaging sensor, much further back, after taking into account the OAG & Filter Wheel, and same comma corrector etc., I was wondering If I could make some custom sized adapters to test, and find the optimal adapter length.

It doesn't help much, when SW, think that the only type of camera that will be attached, to the corrector, will be a DSLR....

All the 'standard ' adapters, seem to come as a tube with an internal thread at one end, and an external screw thread at the other, but as both the comma corrector and the camera have external screw connections. M48 / M42 respectively, I was looking for a single piece adapter, tube with internal threads at both ends, which don't seem to be available anywhere....

So this got me thinking about printing a range of suitable adapters,  soooo ....   

After searching around, and trying some of the 'customisable' generic Bolt\Nut examples, to be found on Thingiverse etc. I found them ok with the 'standard' sizes of M2-M6 etc., which use a pitch size of 0.455mm, as soon as the pitch size is changed to 0.75mm (Astro spec), they failed.....

But then I came across an OpenScad (https://openscad.org/) library on YouMagine (https://www.youmagine.com/designs/openscad-metric-nut-bolt-threads-library), which worked ok after modifying, creating model files, slicing, printing etc.....

So if you want to have a play for yourself, I humbly offer the following (heavily modified) scad files with examples etc.     

Now, if only there were some clear skies....

M48-M42_12mm_Adapter.scadM48-M42_27.5mm_Adapter.stlM48-M42_27.5mm_Adapter.scadM48-M42_20mm_Adapter.stlM48-M42_15mm_Adapter.stlM48-M42_12mm_Adapter.stl