Technic pin friction primitives

Technic pin friction primitives
When I uploaded 18651 a month ago Philo suggested that a new "blind" confric primitive might be suitable as there is currently some primitive overlap within the part. I started putting one together when I noticed that 3749 (which is frictionless but has the same kind of connection) has the pin part mostly built with quads and lines rather than "connect.dat". 43093 also has the same issue that I currently have with 18651.

My thought was that, rather than creating a blind "confric*.dat" primitive, only for a blind "connect*.dat" primitive to be created for 3749 some time later, would it be worth creating just the "connect" primitive and then a separate primitive for the "friction" bumps? These could then be overlaid on to the new "connect" to make a new "confric"?

As an example, below is "connect.dat" with 8 friction primitives overlaid to make "confric.dat".

[Image: confric.png]

If others were behind this idea, would "fric.dat", "fric2.dat", etc., be good enough names for these friction primitives?

On a separate note, would there be any reason to not use "confric4.dat" for a new "blind" confric primitive? There appears to be no trace of this part name in use on the Parts Tracker.
Re: Technic pin friction primitives
Seems a good proposal... Found no trace of confric4.
Re: Technic pin friction primitives
I like the idea of having the friction implementation in a dedicated file a lot.
Your composition convinces me.
Re: Technic pin friction primitives
This is very LEGO. Modularization.
Add something to an existing design, and you'll have a new part.
Take two ideas, add them together, and you have an invention.
Re: Technic pin friction primitives
I guess that's decided then!

From looking at the "Technic connector primitives" on the Primitives Reference page I see about four main friction primitives:
  • short with rounded ends
  • long with rounded ends
  • short with square ends (confric3.dat)
  • long with square ends (confric3.dat)
As the last two are currently specific to one part, I'll probably just create the first two for the time being.

There are also the thin frictionless ribs used on connect7.dat, but again these are specific to one part.
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