Help with z movement | VORONDesign | Page 1

zenith plinth Jun 14, 2025, 9:43 AM

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When I home all axis looks like back part of gantry goes faster than front one. Currents an gear ratio area all the same, belts , between 5.6 5.8 all with big belt meter, can someone e give me a clue? Belt tension? Loose assembly, motors… gantry rc 0.8 he 0.3 z motor rc 0.6 and he 0.3 as well. Gear ratio inz’s 80:16 , micro steps 40 rotation 16.homing speed, and retraction fist only in z; must I configure it the same in all
Z’s? Thanks. Specially frightening z1 behavior when reaching bottom

drifting brook Jun 14, 2025, 9:48 AM

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zenith plinth When I home all axis looks like back part of gantry goes faster than front one. ...

do you have the correctly sized pulleys installed?

zenith plinth Jun 14, 2025, 9:49 AM

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Yes

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Gt2 20 6mm

drifting brook Jun 14, 2025, 9:51 AM

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zenith plinth Yes

are you 100% sure they all have the same tooth count?

zenith plinth Jun 14, 2025, 9:53 AM

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Now you make me doubt , three of them for your yes, last one (slippering one, I bought a spare…, need to check if the other three are 20 as well

zenith plinth Jun 14, 2025, 10:12 AM

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All gt2 6 20T 5mm

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I get some TMC 'stepper_z' reports GSTAT: 00000005 reset=1(Reset) uv_cp=1(Undervoltage!)
TMC 'stepper_z' reports GSTAT: 00000000
TMC 'stepper_z1' reports GSTAT: 00000005 reset=1(Reset) uv_cp=1(Undervoltage!)
TMC 'stepper_z2' reports GSTAT: 00000005 reset=1(Reset) uv_cp=1(Undervoltage!)
TMC 'stepper_z1' reports GSTAT: 00000000
TMC 'stepper_z3' reports GSTAT: 00000005 reset=1(Reset) uv_cp=1(Undervoltage!)
TMC 'stepper_z2' reports GSTAT: 00000000

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I asm using TMC5160T pro

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v1

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I use a meanwell PSU500

zenith plinth Jun 14, 2025, 10:45 AM

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It looks like back motors move faster than front ones

regal tangle Jun 14, 2025, 10:47 AM

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Those errors are something that needs to be dealt with, and could very well be causing it to skip steps making it appear they're moving slower.

zenith plinth Jun 14, 2025, 10:48 AM

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I have read about that , calling issues or so…

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But the look normal

regal tangle Jun 14, 2025, 10:49 AM

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The usual reasons for uv_cp=1 are too weak power supply or thin power wiring to the mainboard. Might also be that four chonky 5160's all turning at once is a pretty big current peak.

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I looked at the config you posted in that other thread, and run_current: 0.6 sounds pretty sensible. But I've only used the milder tmc2209 for Z drive (as do most people afaik), maybe four 5160's is a bit of a problem, idk.

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In any case, I wouldn't go around chasing "uneven movement" issues until those stepper driver errors are fixed, they could very well be the reason for it.

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What does your power wiring between PSU and mainboard look like?

zenith plinth Jun 14, 2025, 12:01 PM

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It looks ok , I have tried grounding chassis , just in case…but, manipulating tha printer, even I do always, because in the past I broke a usbc octopus’s port , I forgot to un plug board this time. Another broken usbc port, another board (already tried UART unseccusfully…..) well … another 76 bucks from Amazon (I am too frustrated for waiting 10 days to Ali). If raising to 0.8 does not fix the issue , I will be back to the old and trusty 2209’s and forget to have a nuclear plant like Voron

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Really , really hard learning curve (and expensive 🤣)

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Tomorrow I’ll get the new board

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Another thought is why am I that sticked to h723… maybe I will. Ever notice any difference than using f446 or f429 , like with 5160t’s…

#Help with z movement