# Ender 3 Max with an SKR Mini E3 V2.0, a BLTouch, filament sensor firmware?
**URL:** https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113
**Category:** Firmware Builder
**Tags:** bltouch
**Created:** [15 August 2021 06:53 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113 "2021-08-15T06:53:14Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [15 August 2021 06:53 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/1 "2021-08-15T06:53:14Z")
I have an Ender 3 Max with an SKR Mini E3 V2.0, a BLTouch (5-pin-not split pins) and the stock Max filament sensor. I’ve tried the Ender 3 with the SKR, and a modified Ender 3 Max with 4.2.7 - none worked. The Ender 3 Max one almost worked but it’s still looking for the Z limit switch.
Is it possible to make a firmware for an Ender 3 Max with an SKR Mini E3 V2.0, a BLTouch (5-pin-not split) and the stock Max filament sensor?
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### Author:  [@CRCinAU](https://marlin.crc.id.au/forum/u/CRCinAU)
#### Post date: [15 August 2021 13:55 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/2 "2021-08-15T13:55:52Z")
You might be able to do this via the [Firmware Builder](https://marlin.crc.id.au/builder/) - however you’d need to pick the Ender 3 with SKR E3 Mini v2.0 mainboard - but change the bed dimensions to match the Max.
You’d also need to select the correct filament runout options.
I believe the rest is similar enough that it should just work.
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### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [15 August 2021 14:26 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/3 "2021-08-15T14:26:32Z")
I tried that (end 3 w/SKR) and set the bed at 300,300,340, but it didn’t work as it was still trying to use the z-stop even though ticked “use probe for z home”?
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### Author:  [@CRCinAU](https://marlin.crc.id.au/forum/u/CRCinAU)
#### Post date: [15 August 2021 14:50 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/4 "2021-08-15T14:50:39Z")
Did you tick the ‘Use Probe for Z homing’ option?
Otherwise it will still use the Z-Stop for homing, but the probe for G29 etc.
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### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [15 August 2021 15:54 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/5 "2021-08-15T15:54:14Z")
Yes, see answer above
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### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [15 August 2021 15:58 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/6 "2021-08-15T15:58:06Z")
On my Ender 3 Pro (old printer), the BLTouch was used for everything, z homing and bed leveling…that’s not the case with the Ender 3 Max?
But I was using the TH3D Unified on that printer.
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### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [15 August 2021 16:06 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/7 "2021-08-15T16:06:47Z")
Also, if I create a firmware, is there a way to enable the “Z Offset Wizard” on the LCD?
One LAST side question, is there a webpage which explains all the settings on the LCD…some are unusual, like fade?
Sorry for so many questions.
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### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [15 August 2021 16:12 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/8 "2021-08-15T16:12:24Z")
So to recap:
Ender 3 Max with an SKR Mini E3 V2.0, a BLTouch (5-pin-not split pins) and the stock Max filament sensor firmware.
Enable the “Z Offset Wizard” on LCD
Use probe for all homing and leveling (not z-stop)
Doing leveling on my Ender 3 Max, the printer homes correctly, but the BLTouch probe starts too far forward off the bed (and fails)
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### Author:  [@CRCinAU](https://marlin.crc.id.au/forum/u/CRCinAU)
#### Post date: [16 August 2021 13:16 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/9 "2021-08-16T13:16:00Z")
Your problem with the nozzle / probe being misaligned is probably due to no Probe Offset being set.
You can set this via [M851](https://marlinfw.org/docs/gcode/M851.html) or in the text menu:
Configuration → Advanced Settings → Probe Offsets
The Fade Height is explained in the [M420](https://marlinfw.org/docs/gcode/M420.html) command documentation.
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### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [16 August 2021 18:40 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/10 "2021-08-16T18:40:47Z")
Thanks.
But what about my other question? Can that firmware be made?
Ender 3 Max with an SKR Mini E3 V2.0, a BLTouch (5-pin-not split pins) and the stock Max filament sensor firmware.
Enable the “Z Offset Wizard” on LCD
Use probe for all homing and leveling (not z-stop)
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### Author:  [@CRCinAU](https://marlin.crc.id.au/forum/u/CRCinAU)
#### Post date: [16 August 2021 23:27 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/11 "2021-08-16T23:27:13Z")
Yes, these options are already available in the [Firmware Builder](https://marlin.crc.id.au/builder/) to allow that to be built.
However as mentioned, use the Ender 3 preset and change the bed size to suit the Ender 3 Max.
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### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [17 August 2021 00:16 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/12 "2021-08-17T00:16:09Z")
I don’t see an SKR option, only 4.2.2 & 4.2.7?
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### Author:  [@CRCinAU](https://marlin.crc.id.au/forum/u/CRCinAU)
#### Post date: [17 August 2021 00:47 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/13 "2021-08-17T00:47:01Z")
As mentioned, use the Ender 3 preset and adjust your bed size / build area to suit. You should be able to select the correct filament runout sensor options as well.
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### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [17 August 2021 03:04 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/14 "2021-08-17T03:04:38Z")
My apologies, you’re right. I’ll try that one.
The big problem is that when I do set the BLTouch for Z homing, as the Z gantry is coming down, I push the BLTouch pin and it sucks in but the gantry continues to drop until it hits the Z stop limit. It’s almost like the BLtouch is powered up but the firmware isn’t looking for that input, but still using the Z endstop switch.
Here’s settings I’m using:
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### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [17 August 2021 03:05 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/15 "2021-08-17T03:05:09Z")
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### Author:  [@CRCinAU](https://marlin.crc.id.au/forum/u/CRCinAU)
#### Post date: [17 August 2021 03:48 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/16 "2021-08-17T03:48:43Z")
> [@svankley](#):
>
> The big problem is that when I do set the BLTouch for Z homing, as the Z gantry is coming down, I push the BLTouch pin and it sucks in but the gantry continues to drop until it hits the Z stop limit. It’s almost like the BLtouch is powered up but the firmware isn’t looking for that input, but still using the Z endstop switch.
If that’s still the case, I would check the black/white part of the cable on the BLTouch - as that sounds like it might be backwards.
The BLTouch FAQ might be helpful to diagnose:
[https://discourse.crc.id.au/t/bltouch-frequently-asked-questions/19](https://discourse.crc.id.au/t/bltouch-frequently-asked-questions/19)
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### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [17 August 2021 21:56 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/17 "2021-08-17T21:56:24Z")
Your last explanation was the ticket. I got everything working. The only thing is won’t keep home, even without cycling power.
The Z axis motor growls on small homing upward moves, never down. I checked the tightness of the rollers, all good.
I can re-home and Z-offset 5 times to the perfect level with feeler gauge, print the exact same test print and they’ll all turn out different (some too high, too low and just right) - it’s inconsistent.
I originally tried other firmware before I found your and those didn’t work, but the Z servo didn’t growl.
Thoughts?
And by the way THANK YOU so much for your help!! I know I’ve been a bother, but I’ll post that you guys were fantastic with trying to help me!
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### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [18 August 2021 01:26 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/19 "2021-08-18T01:26:48Z")
Tried to add a movie, but heres the audio: [vankley.myqnapcloud.com/images/growling.mov](http://vankley.myqnapcloud.com/images/growling.mov)
It’s the 2 sounds at the end.
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### Author:  [@CRCinAU](https://marlin.crc.id.au/forum/u/CRCinAU)
#### Post date: [18 August 2021 02:47 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/20 "2021-08-18T02:47:02Z")
That could be fine. When you’re between full steps on the stepper, it can make noises like that - and its a normal part of its operation…
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### Author:  [@svankley](https://marlin.crc.id.au/forum/u/svankley)
#### Post date: [18 August 2021 05:01 UTC](https://marlin.crc.id.au/forum/t/ender-3-max-with-an-skr-mini-e3-v2-0-a-bltouch-filament-sensor-firmware/113/21 "2021-08-18T05:01:05Z")
Thanks for the response.
Any thoughts on why other firmware doesn’t make that noise?
Also, any thoughts on why this unit won’t keep correct home even when I do the auto home, proper Z-offset and BLTouch 5-point bed leveling? Then when I print something, sometimes it’s way too far away, and sometimes it scrapes the bed?
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