[sdiy] I can print knobs!

[Elain Klopke]

> Very interesting. Looking at the lack of detail in 3D printed
> objects, I've always thought that 3D printers would be useless
> for parts that must have precise dimensions... like press-fit
> knobs.
>
> Is this for a D shaft or splined shaft ?
>

This knob is for a fine splined or smooth shaft.


> How does it fit ? Loose ? Tight ? Just right ?
>
>
It fits snuggly. On the splined shaft it will come off with some effort, on
the smooth shaft it will come off with over-enthusiastic knob twiddling.


> Which make and model is the printer ?
>

I'm currently using  a Prusia i3 Mk2. 0.4mm tip, PLA 200 C on the extruder,
60 C on the bed. 0.09 mm layers. Printed with a raft.


> They look good!  Did you post this on reddit the other day?

Thank you! I did not. I actually avoid Reddit due to some pretty bad
experiences.

> I once saw such side walls in modular shape so that you could mount 3
together to get a bent 3 panel system like the moog mother triple module...
but I didn't save the link... :-(

That's my next rail end-cap project. Probably a couple months down the road
when I fill up the 84HP that I have now.

> when you need precise dimensions you can also use the 3D print for the
rough size and then post process it. e.g. I usually print holes undersized
and then drill them to final size later. so e.g. if you need a press fit on
a round shaft, print to 5.5 and drill to 5.9 for a 6mm shaft.

I think it depends on the printer... For example, in the model for the
knob, the hole is 5.95 mm and it fits nice and snug. On the rail end caps I
made a couple days ago, the holes were half a mm larger than the machine
screws and countersunk even and I had no problems sliding the screws
through the holes at all. YMMV
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