Hi Peter,
For my first attempt, I tried self-adhesive felt as used by Kowa's own adapters, but I didn't manage to find the optics-quality stuff they are using:
https://www.birdforum.net/showthread.php?t=347042
My next attempt was very slightly too wide, which I corrected with a few layers of Tesa film.
I also tried some gripping "ridges" as suggested by Pete from Opticron, but I made them too large, and they seemed to be slightly abrasive to the eyepiece rubber, so I ended up cutting them away. The fit is good enough without them.
You're spot on with OpenSCAD, it's my preferred tool these days. I sort of like FreeCAD, but I should have given up on it sooner when I was told I shouldn't expect to be able to create parametric designs right off the bat. FreeCAD also a deep and as far as I know still unresolved problem ("topological naming") that's at the root of both the difficulty of parametric designs being difficult and the tendency of designs to fall apart on changes.
Anyway, I have a parametric version of my adapter half-finished in OpenSCAD, and will probably upload that to thingiverse too, once it's ready.
Regards,
Henning
CHAnge one variable with parametric design... OpenSCAD ;-)
I normally print a little oversize and then use a strip of gorilla/duct tape to get a snug slip on fit.... sure saves on sanding if you aim for printing an exact fit and miss.....
For my first attempt, I tried self-adhesive felt as used by Kowa's own adapters, but I didn't manage to find the optics-quality stuff they are using:
https://www.birdforum.net/showthread.php?t=347042
My next attempt was very slightly too wide, which I corrected with a few layers of Tesa film.
I also tried some gripping "ridges" as suggested by Pete from Opticron, but I made them too large, and they seemed to be slightly abrasive to the eyepiece rubber, so I ended up cutting them away. The fit is good enough without them.
You're spot on with OpenSCAD, it's my preferred tool these days. I sort of like FreeCAD, but I should have given up on it sooner when I was told I shouldn't expect to be able to create parametric designs right off the bat. FreeCAD also a deep and as far as I know still unresolved problem ("topological naming") that's at the root of both the difficulty of parametric designs being difficult and the tendency of designs to fall apart on changes.
Anyway, I have a parametric version of my adapter half-finished in OpenSCAD, and will probably upload that to thingiverse too, once it's ready.
Regards,
Henning