# Ender 3 MAX with BLtouch Filament runout sensor reversed

**URL:** https://marlin.crc.id.au/forum/t/ender-3-max-with-bltouch-filament-runout-sensor-reversed/2387
**Category:** Feature Requests
**Created:** [5 January 2025 15:38 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-bltouch-filament-runout-sensor-reversed/2387 "2025-01-05T15:38:17Z")
**Posts on this page:** 1
**Showing post:** 3

<div class="post-metadata">

### Author: ![BCNU](https://marlin.crc.id.au/forum/letter_avatar_proxy/v4/letter/b/9d8465/32.png) [@BCNU](https://marlin.crc.id.au/forum/u/BCNU)
#### Post date: [1 June 2025 18:40 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-bltouch-filament-runout-sensor-reversed/2387/3 "2025-06-01T18:40:03Z")

</div>

I’m having the same problem.  
I reversed the wiring per this post: [Ender 3 Max 4.2.2 with Bltouch Filament sensor is reversed](https://marlin.crc.id.au/forum/t/ender-3-max-4-2-2-with-bltouch-filament-sensor-is-reversed/1624)

Because of the reversed polarity, the LED indicator in the filament sensor no longer works.

It would be nice if there was a menu item to reverse the logic for the filament sensor.

I’m not a user of Firmware Builder.

---

_[View the full topic](https://marlin.crc.id.au/forum/t/ender-3-max-with-bltouch-filament-runout-sensor-reversed/2387)._