Recreation of knobs

[oic-u3d2]

Did you have one in mind or an example you could show us?
If you're looking for some typical knobs and other hardware, McMaster-Carr's website has CAD files for a lot of their catalog.
Usually, if I can't find dimensions but i can find some good pictures that show a side or a top view - I'm not above holding a ruler up to the computer screen and measuring the longest side, making up a Scale Factor and modeling it from that. It's best to use the longest dimension..

(Final Size you decide) / (Measured longest side) = (Scale Factor)

From there, keep measuring and multiply by the Scale Factor to get the rest of the dimensions - some extrapolation may be required...

[sesc360]

This is what I would like to do:

http://www.leobodnar.com/shop/images/ELMA-knobs.png

Pretty difficult I guess? Sure I could buy one of these... But they are pretty expensive. So why not 3D Print them for my own usage, as I will need more than 1... Do you think this is a feasible endavour?

[sesc360]

oh this is awesome.. I didn't know about them! I unfortunately don't have found any dual rotaries like above.

Did you have one in mind or an example you could show us?
If you're looking for some typical knobs and other hardware, McMaster-Carr's website has CAD files for a lot of their catalog.
Usually, if I can't find dimensions but i can find some good pictures that show a side or a top view - I'm not above holding a ruler up to the computer screen and measuring the longest side, making up a Scale Factor and modeling it from that. It's best to use the longest dimension..

(Final Size you decide) / (Measured longest side) = (Scale Factor)

From there, keep measuring and multiply by the Scale Factor to get the rest of the dimensions - some extrapolation may be required...