Layer shifts at high speeds on VC3-400

Hi everyone, wondering what the usual max speeds / accels are on a VC3 400 on 24V. I'm running into layer shifts at 35000 mm/s² and 300 mm/s infills. I'm using the official kits with the LDO motors. run_current is set to 1.768 A
18 Replies
miklschmidt
miklschmidt17mo ago
This should indeed be possible, maybe belts are too tight? Last i tried maxing out 24V i got to 45k @ 350 mm/s
like-gold
like-gold17mo ago
That's... a lot 😄 Well it can do 35k and 350mm/s but not while printing /extruding The belts are tightened so they just don't smack the extrusions so more on the loose side of things i'd say
miklschmidt
miklschmidt17mo ago
Hmm
like-gold
like-gold17mo ago
I mean.. it has a drag chain mounted to it, so that may reduce possible accelerations somewhat. IIRC, you had your's with chain but went back to an umbillical, didn't you?
miklschmidt
miklschmidt17mo ago
i did yeah the 45k was with the drag chain And even a heavy BMG
miklschmidt
miklschmidt17mo ago
EVA-3D
YouTube
400mm Rat Rig V-Core 3 #speedboat!
5:27 #speedboat done on the 400mm Rat Rig V-Core 3. Hotend: Nitram's #volcomosq Extruder: Bondtech BMG Cooling: Delta Electronics PFB0412EN-E at 80% PWM Mechanics and electronics are stock except for the addition of a bottom panel, which i doubt makes any difference. Firmware: V-CoreOS (Klipper) https://rat-rig.github.io/V-CoreOS Acceleration:...
miklschmidt
miklschmidt17mo ago
Acceleration: 42000 mm/s^2 Accel to Decel: 21000 mm/s^2 Square Corner Velocity: 80
like-gold
like-gold17mo ago
Hm, I had it on accel to decel 35k as well
miklschmidt
miklschmidt17mo ago
That does make a difference
like-gold
like-gold17mo ago
and 15 sqv So it’s probably breaking quite hard on those moves
miklschmidt
miklschmidt17mo ago
80 is a whole lot worse It basically means "you can make a 90 degree turn at this speed"
like-gold
like-gold17mo ago
hmkay makes sense 😄
miklschmidt
miklschmidt17mo ago
But try half accel_to_decel that should help
like-gold
like-gold17mo ago
i'll try that. any tips on efficiently finding your max accel? printing and just upping it in the ui?
miklschmidt
miklschmidt17mo ago
I don't have it anymore but i made a gcode macro that looped through a bunch of long moves and very short moves a bunch of times. Then i just ran that at higher and higher accels until it started skipping. Then i started increasing the speed until it started skipping. You wan't both X/Y and diagonal moves of course That works too, just a bit more messy 😄
like-gold
like-gold17mo ago
do I really want combined x/y moves? shouldn't diagonal moves that only stress one motor at a time be the weakpoint?
miklschmidt
miklschmidt17mo ago
It's a bit complicated because Y for example is moving a lot more mass. But X shouldn't matter.
like-gold
like-gold17mo ago
ah That did the trick chefkiss
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