A few years ago I upgraded a Tronxy X5S to a Bigtree SKR v1.3 board and a BIQU H2 extruder. Up until recently it had been working fine. Then one day it started under extruding. Initially I thought this was a slicer setting issue, but I confirmed that a known good previous g-code file also under extruded. Next I removed the BIQU unit and disassembled/reassembled to make sure there was nothing wrong with it. Then I checked the wiring to the motor and confirmed that each phase wire was making it from the motor to the controller. I thought perhaps this was a stepper driver issue. So I swapped the extruder driver with one from the Z axis. No improvement. Fearing that perhaps there was a problem with the stepper motor on the extruder I decided to purchase a newer BIQU H2 V2 for $40 from aliexpress. I installed the new extruder today and it was still under extruding. FWIW the E-steps recommended for the BIQU extruders is 932 and this is what I had set previously I decided to re-calib the E-steps. When told to extrude 100mm it would only extrude about 40mm. So now I have e-steps set to 2330 and the printer is now extruding properly. - So, why suddenly does the extruder need so much more e-steps? https://reprap.org/forum/read.php?415,896704,896704#msg-896704 Wed, 15 Jul 2026 15:03:51 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?415,896704,896710#msg-896710 https://reprap.org/forum/read.php?415,896704,896710#msg-896710
But still no understanding regarding the mystery of the E-steps.]]> brokencase Firmware - Marlin Thu, 03 Apr 2025 16:17:16 -0400 https://reprap.org/forum/read.php?415,896704,896709#msg-896709 https://reprap.org/forum/read.php?415,896704,896709#msg-896709
I have Stealthchop turned off on the extruder. It has always been this way. I figured no fancy modes needed for the extruder when I built the firmware a few years ago,

Stealthchop is on for all the axis drivers.

My Jumpers for the extruder are set like this guy's
[medium.com]

In any case, I pulled the jumpers and installed new fresh jumpers.

No change - doing test print now still with e-steps set to 2330.]]> brokencase Firmware - Marlin Thu, 03 Apr 2025 13:25:12 -0400 https://reprap.org/forum/read.php?415,896704,896708#msg-896708 https://reprap.org/forum/read.php?415,896704,896708#msg-896708 nophead Firmware - Marlin Thu, 03 Apr 2025 12:54:45 -0400 https://reprap.org/forum/read.php?415,896704,896707#msg-896707 https://reprap.org/forum/read.php?415,896704,896707#msg-896707
I will check the jumpers associated with the extruder. Reseat them. Maybe one came loose.

You got me thinking. I'm also going to check what the motor current is set to for the extruder. Maybe that somehow got changed. As I recall that can be changed through the menu.

Firmware is Marlin BTW. Marlin-bugfix-2.1.x]]> brokencase Firmware - Marlin Thu, 03 Apr 2025 10:37:16 -0400 https://reprap.org/forum/read.php?415,896704,896706#msg-896706 https://reprap.org/forum/read.php?415,896704,896706#msg-896706 nophead Firmware - Marlin Thu, 03 Apr 2025 08:46:03 -0400 https://reprap.org/forum/read.php?415,896704,896705#msg-896705 https://reprap.org/forum/read.php?415,896704,896705#msg-896705
Check your microsteping.

How this is set is changes depending on your stepper driver type

Some are just jumpers under the stepper driver]]> Dust Firmware - Marlin Thu, 03 Apr 2025 06:33:11 -0400 https://reprap.org/forum/read.php?415,896704,896704#msg-896704 https://reprap.org/forum/read.php?415,896704,896704#msg-896704
Up until recently it had been working fine. Then one day it started under extruding.

Initially I thought this was a slicer setting issue, but I confirmed that a known good previous g-code file also under extruded.

Next I removed the BIQU unit and disassembled/reassembled to make sure there was nothing wrong with it.

Then I checked the wiring to the motor and confirmed that each phase wire was making it from the motor to the controller.

I thought perhaps this was a stepper driver issue. So I swapped the extruder driver with one from the Z axis. No improvement.

Fearing that perhaps there was a problem with the stepper motor on the extruder I decided to purchase a newer BIQU H2 V2 for $40 from aliexpress.

I installed the new extruder today and it was still under extruding. FWIW the E-steps recommended for the BIQU extruders is 932 and this is what I had set previously

I decided to re-calib the E-steps. When told to extrude 100mm it would only extrude about 40mm.

So now I have e-steps set to 2330 and the printer is now extruding properly.
-
So, why suddenly does the extruder need so much more e-steps?]]> brokencase Firmware - Marlin Thu, 03 Apr 2025 03:18:50 -0400