# Installing a new mini Rambo, questions?

**URL:** <https://forum.lulzbot.com/t/installing-a-new-mini-rambo-questions/3938>\
**Category:** LulzBot Mini\
**Created:** [September 2, 2016, 5:51pm UTC](https://forum.lulzbot.com/t/installing-a-new-mini-rambo-questions/3938 "2016-09-02T17:51:01Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![Biolumo](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/biolumo/32/9340_2.png) [@Biolumo](https://forum.lulzbot.com/u/Biolumo)\
**Post date:** [September 22, 2016, 1:33am UTC](https://forum.lulzbot.com/t/installing-a-new-mini-rambo-questions/3938/7 "2016-09-22T01:33:11Z")

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> [@Fancyfuchs](#):
>
> Hi Biolumo,
> 
> Thanks for the post back, very helpful! I’m working through your comments bellow and I had another question.
> 
> In looking at the wiring going from the Z-stops into the mini I seem to be confused with why it is connected the way it is.
> 
> The Z- min Stop has navy blue and blacking coming out of it, but it doesn’t run to the Z-min stop on the board. In the OHIA for the mini it shows this connection going into another port on the board, mainly the bottom 2 pins of the ICSP next to the marker X18. If that is correct then what is running into the Z-min stop port with the red and black wire? AKA step 10 in the OHAI?
> 
> Thanks!

Yes, the lulzbot dev team seems to have just done the first workable hack that came to mind when originally designing the mini. Presumably before they added the auto bed leveling feature they had a functional z-min switch. With the bed leveling feature this required them to replace the z-min stop switch with a red 5v wire coming from the nozzle (therby acting as a switch). The blue and black wires probably do indeed go to this redundant z-min switch. Why this switch is still wired up and included on Mini’s being sold is anyone’s guess and i assume just comes down to laziness. or perhaps some sort of internal testing procedure during assembly?

But the basic answer is that the red wire is the one you want in z-min. The blue and black wires theoretically could be ripped out completely without compromising any functionality.

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