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Can't go over 250mm/s no matter what i tried

mfa

Member
Printer Model
trident inspired
Extruder Type
Orbiter
Cooling Type
Other
Hello everyone, nice to meet you

I seem to be stuck at 250mm/s top print speed max.
if i try anything over 250, even 255, i get massive skipping, not even sure if i can call it that, the entire gantry gets stuck in place when moving diagonally after a couple of cm of movement. i would expect it to start skipping some steps when reaching it's limit and then getting progressively worse as i try to increase speed even more not a completely seized gantry and continuous funny motor noises for only 5 extra mm/s.

I made my own printer, have to admit it s not even a real trident since i reused some parts from 2 almost new machines to build it and i didn't want to do much cutting of the rails, or the aluminum profiles and so on so i ended up using the trident as an inspiration, designing my own parts around what i had. i also used the trident's firmware as a starting point. It's the same working principle.
BTT PI 1.2 + adxl345
SKR1.4turbo + BTT exp mot
6 x TMC2209 (sensorless homing for x and y)
BTT Microprobe plugged in the probe + servo on the SKR
Orbiter V2.5 + Volcano (W 0.6 CHT nozzle)
2 x 48mm NEMA17 for A+B / 3 x 40mm nema17 for the z's / the orbiter has it's own nema14 i think it is
12v ATX PSU (500w total i think, one 12vline (cpu lines feeding the skr), one feeding the PI and another one feeding the exp_mot)
750w heated bed @220v w a SSR
all linear rails (all moving smoothly, changed bearing balls in the blocks that seemed "suspicious" )
2020 frame with steel corners (the ones used to hold the furniture, fit perfectly and are really tough)
310x310 print surface
since i'll print a lot of PLA and PETG on it and i won t be enclosing it i used a drop down harness to the print head for lightness etc

I printed a couple of cubes on it , slow speeds, printed a 20cm tall Adalinda on it at 200mm/s max and 8k accell, took about 4.5 hours, printed just fine, really happy with the quality too
I tried something at 300 and then it started acting up, first diagonal movement larger than a couple of cm during the print, the gantry and print head froze in place + motor noise

I tried using Ellis's script (thank you @Ellis for the script+guide) after that to test the machine without printing.
It won t go over 250, no matter what acceleration i tried, same thing, gantry seized in place. even with 255mm/s speed and 400mm accell ....
@250mm/s speed , it seems to be doing fine with as high as 20k accel, only did single iterations so far and did not go over 20k

tightening/loosening the belts did not help
regreasing all the rails did nothing
increasing the voltage for x and y from 0.9 to up to 1.4 did nothing ?!?!
increasing hold current from 0.75 to 1.2 or commenting it out completely did nothing


i built pritners before, i'm relatively new to klipper though
i attached the .cfg bellow the includes are standard (copy / paste the Microprobe config, same foe Ellis's)

should i order a 24v PSU? i still don't unederstand the "voltage" .how the firmware set motor voltage can have a set 0.-1. something volts ut a 24v psu vs a 12v psu helps how? but i'll switch it to 24v if that is the issue

the printer seemed pretty fast to me @200/8k and it prints fine, seemed even faster in the test @250/20k but this hard limit doesn't seem normal at all to me, i think this machine can go faster.
Am i missing something?

Thank you all,
 

Attachments

On your [printer] section the max_velocity setting is at 250, increase that number to the desired max speed, save and restart Klipper.
 
On your [printer] section the max_velocity setting is at 250, increase that number to the desired max speed, save and restart Klipper.
Oh my god, i can t believe i did not see that omg, i m so stupid sometimes :))))))

thank you man, for opening my blind eyes
i can now see :))))
i'll try it in the afternoon
thanks again
 
Oh my god, i can t believe i did not see that omg, i m so stupid sometimes :))))))

thank you man, for opening my blind eyes
i can now see :))))
i'll try it in the afternoon
thanks again
asked someone home to do it now. changed it to 500 .no change in the way the machine behaves, the gantry still gets stuck at 255 test
i think i got overexcited thinking this could be it.
I am the one that set that max 250mm/s speed after seeing it was the most it could do. and promptly forgot about it right after:)
 
From the .cfg I see your using for your x and y 0.9 degree steppers(400 steps per rotation) and 40 teeth pulley? Is that right? And 12v power supply? Maybe there is your problem....
In your [printer] section you can lower the accel to ~4000, or even lower. That value is used for regular printer moves where the accel is not specified, like homing, meshing... etc. The same for the speed value. Give the printer a brake... While printing the values for accel and speed used are the values given by the slicer.
 
Last edited:
hello everyone
Thanks for the replies

so the drivers are the MKS TMC2209 V2.0 from Makerbase. All drivers are the same.If it helps, i can remove one and see if there s something else written on them

The pulleys i use have 20 teeth/pulley not 40. could this be it?
The 400steps for rotation i kept from the cfg i started with.

Thx
*one more thing i noticed, sometimes, not always, after a failed test, when finishing, it tries to move the head in the wrong directions, taking the head towards the front left of the printer instead of the right rear side (if you know the test, once it is done it takes the head towards the rear left side of the printer and then it homes all)
 
the motors if that s what you meant don t have part numbers on them and i lost the invoice... i bought these a few years back for a small cnc i built for someone , (the cnc was only used for about an hour, i just "recycled" 3 rails and 4 motors from it.
I use 2 of the motors for the a/b here .
The other 2 are installed on the x and y on my bed-slinger, working fine (higher print speed and less accell than here, haven t bothered testing anything above 450/8k on it)
 
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