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MarlinFirmware / Marlin

Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.
https://marlinfw.org
GNU General Public License v3.0
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[BUG] Sensorless Homing not functioning CoreXY #26877

Open theomajigga opened 4 months ago

theomajigga commented 4 months ago

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

CoreXY Hypercube style printer FLYF407ZG latest marlin. Dual Z screws. Pins updated for UART and Z2 axis on E0. Wires ran from endstops on board to pin on tmc2209.

Currently have no belts on it to see if there was binding, still does the same thing.

Have attempted every value for threshold that I can think of, changed bump off, etc. Configuration.zip

Bug Timeline

No response

Expected behavior

Homing sequence to finish properly.

Actual behavior

Bounces off of axis slightly and returns to original spot.

Steps to Reproduce

Write firmware to card, and run homing sequence.

Version of Marlin Firmware

Marlin 2.1.2.2

Printer model

Hypercube Evolution

Electronics

FLYF407ZG

LCD/Controller

No response

Other add-ons

No response

Bed Leveling

UBL Bilinear mesh

Your Slicer

Cura

Host Software

Pronterface

Don't forget to include

Additional information & file uploads

No response

ellensp commented 4 months ago

You really should not use Sensorless for any axis using a lead screw, especially Z. Sensorless is not at all accurate or repeatable. on Z this will result in damaging your bed.

You need to tune Sensorless to your hardware, not only STALL_SENSITIVITY but also the homing feed rate.

So called Sensorless is a misnomer, in reality it is using the stepper drivers stall detection feature. As such you need the axis to be moving fast enough and to stop abruptly enough to trigger the stepper driver stall detection.

Finding the correct setting for your machine takes time and experimentation. It is also much harder to tune on a core xy, since the two stepper motors are joined via the belt.

You also need to check that talking to your stepper drivers is working. If its not talking, you cannot set the sensitivity. Use M122

Also test bugfix2.1.x Many things are broken on 2.1.2.2

vfbank commented 4 months ago

Sensorless homing does not work properly with the leadscrew Z method. The TMC2209 operates by detecting bump stall (impact), so it does not operate properly on leadscrews with couplers connected.

theomajigga commented 4 months ago

Adding it to Z was a last ditch effort to adding it to any axis with a TMC on it.

Will do bugfix M122 does deliver output.

Wil test bugfix.

PKav89 commented 2 months ago

Hi! Same issue. Sensorless homing on latest bugfix works on cartesian machines, but not on CoreXY. 2.1.2.2 works well on CoreXY. Have you found solution?