3D Printing for stacked/concentric bottom knob

[lonote]

I have been working on some smaller chassis & generally more simple designs and to that end, I want to use concentric pots in some cases to save panel space.

Ideally, I would like to use the brown-face style cupcake/barrel knobs on the top (maybe trimmed down in height) for the top & an appropriately similar/matching larger diameter knob for the bottom. Ending up roughly looking like the 60s Danelectro stacked knobs, but, I don't think such a thing exists as a set.

Of course the top knobs are easy to get, so coming up with a bottom knob is the quest.

I have no experience with 3D printing, but from what little I know, it seems like the bottom knob would be a good candidate for 3D printing. I imagine it looking just like a section of the regular knob; but a larger diameter with splines on the rim & with a flat top.

I was wondering if anyone here has experience &/or insights as where to start to have a few of these made?

DANELECTRO KNOB SET

Danelectro knobs 2.jpg

Cupcake-barrel knob.JPG

[Stevem]

Note that signal wise you do not want to mess with bringing two out of phase signals into a concentric pot if one of them is feeding a grid.

[TUBEDUDE]

You'll need to make a type of CAD file describing the knob as a physical model for the printer to lay the filament down. Find someone with a printer and ask what type of file their machine will work from.

[jabguit]

Note that signal wise you do not want to mess with bringing two out of phase signals into a concentric pot if one of them is feeding a grid.

why not?? separate elements in individual cases - shouldn't be any issues, especially if shielded leads are used.


cheers,

[lonote]

Thanks all for the replies. Turns out my son-in-law uses some 3D printers at his company & has graciously offered to draw it up for me. I didn't realize that they used them until it came up at the T-giving gathering.

Note that signal wise you do not want to mess with bringing two out of phase signals into a concentric pot if one of them is feeding a grid.

why not?? separate elements in individual cases - shouldn't be any issues, especially if shielded leads are used.


cheers,

I am wondering about this also. No shared electrical points, just in the same shell. Are you saying there is a potential proximity effect?

[sluckey]

Note that signal wise you do not want to mess with bringing two out of phase signals into a concentric pot if one of them is feeding a grid.

This is not an issue. Prime example... LarMar PPIMV.

[BrownIsound]

If someone made a BF/SF hat knob like this (barrel one section, the skirt the other), it would be great for adding to amps without mid pots. I’d buy it!

[xtian]

Here are some options:

https://www.tubesandmore.com/search/node/concentric

[lonote]

Here are some options:

https://www.tubesandmore.com/search/node/concentric

Thanks for the links, I have bought some of those but looking for a more "traditional" aesthetic.

If someone made a BF/SF hat knob like this (barrel one section, the skirt the other), it would be great for adding to amps without mid pots. I’d buy it!

I had a similar thought a while ago & bought a couple mini-witch hat knobs that were used on some more recent low-end Fender product, I think.

The idea was to use those as the top knob above the separated skirt from a full-size Fender knob for the bottom (as you describe)

Haven't gotten around to that yet...

[GlideOn]

This is a brilliant idea.

I'd say there's already a significant market for jazz-based knobs in any other color, but cream or black, especially the lower concentric.