# Looking at buying used and need feedback

**URL:** <https://forum.onefinitycnc.com/t/looking-at-buying-used-and-need-feedback/24946>\
**Category:** Uncategorized\
**Created:** [January 26, 2024, 5:42pm UTC](https://forum.onefinitycnc.com/t/looking-at-buying-used-and-need-feedback/24946 "2024-01-26T17:42:08Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [January 26, 2024, 7:23pm UTC](https://forum.onefinitycnc.com/t/looking-at-buying-used-and-need-feedback/24946/4 "2024-01-26T19:23:42Z")

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Hey Matt,

if Onefinity should provide you with a replacement of the [buildbotics](https://buildbotics.com/)-derived [Onefinity Controller](https://www.onefinitycnc.com/_files/ugd/1cee9f_bed246d0462e443ab8f782f2384d4ddb.pdf), [which they stated would be $500 +VAT](https://forum.onefinitycnc.com/t/selling-my-machine/21349/2), you will hardly get a stand-alone and [nearly](https://aiph5u.de/cnc/onefinity/Onefinity_CNC_Controller_G-code_cheat_sheet.html) fully [RS-274NGC](https://en.wikipedia.org/wiki/g-code)-compatible 4-axis CNC controller with integrated stepper motor drivers and remote network access at a lower price. They may sell you one if you are the new owner. I would contact them per e-mail.

Most people kill their Onefinity controller by not using an adequate dust collection in their workshop and the fan of the controller draws all the dust. Wood dust destroys electronics. You could try to see if it is the version with the rocker switch (hardware controller [version \<=v4](https://github.com/OneFinityCNC/onefinity-pcb/tree/master/Schematics)), if the switch has dust inside, you can find the servicing instruction to repair it here:

> [@Power switch request](https://forum.onefinitycnc.com/t/power-switch-request/8887/4):
>
> [![Screenshot_2021-11-12__Onefinity_Support_-Servicing_A_Faulty_Power_Switch-_Youtube_Video](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/2X/0/00efee0d685f75116736a1af8a8517c2183d352a.png)  
> ](https://www.youtube.com/watch?v=lpl2sWEzMKs&t=95s)

or here is a link to a [rocker switch replacement](https://www.farnell.com/datasheets/2554181.pdf).

I strongly suggest enclosing your CNC controller in an enclosure [like this one](https://forum.onefinitycnc.com/t/pwr-communication-failed-at-reg-0-i2c-read-word-failed-errno-121-remote-i-o-error/18177/17).

Welcome to the forum!

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