Cable assemblies made of 40-wire rainbow ribbon with individual single dupont pins on each wire are cheap all over the place on ebay and aliexpress. You could get male-male 40-wire assemblies and just cut them in half. every 3 wires would be a different set of 3 colors, and none of them would be polarized. Mostly they are short cables though, so I;m not sure if anyone makes them long enough that when you cut them in half they are long enough to reach wherever they need to go inside the M100.

aha... go on ebay or aliexpress and search by "servo cable" or "1000mm servo extension" Not polarized if you need all 3 positions. Most are short, but they are available in various lengths up to 100cm from multiple sellers. Change the sort to nearest first and you don't have to wait for China but pay a little more.
https://www.ebay.com/itm/282815153348/
https://www.ebay.com/itm/291408436349/

Just a start, I'll poke around some more.

--
bkw



On 8/10/19 6:39 PM, Stephen Adolph wrote:
Good idea.
Would like to sort out how to purchase ready made 3 wire leads that plug into a header...any ideas?

On Saturday, August 10, 2019, Brian K. White <[email protected] <mailto:[email protected]>> wrote:

    On 8/10/19 1:29 PM, Stephen Adolph wrote:


        With all the large parts on one side.. it is actually a bit
        hard to find places for vias for external signals.


    If there's nothing on top, you could just solder a surface mount
    header on top. But then so much for simplifying the manufacturing.
    Though I'd still want to solder pin headers into the vias anyway
    just so it's removable, so what's the difference?
    Thinking out load, not a challenge.

-- bkw


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