Best posts made by JJJJ

@JJJJ I have got the fuse out, but i have not got a one amp to test yet.

@droftarts Apparently if z hop speed is 0 that's what causes that pause. I changed that number and it changed that gcode line to actually have a speed so I think that's what was causing it.

I think I just forgot to add a number when I was setting up the profile.

Thanks for your help as I would of never spotted that in the gcode.

Hi everyone,

I have a Tractus 3D 1250 printer, and I've recently encountered some major issues.

Issue 1: Y-Axis Stopping Mid-Print
A few days ago, my printer failed on a long print because the Y-axis stopped moving
(I have a video of it failing but I cant share links in this post)

I initially suspected motor overheating, as I had the current set a bit high.

To be safe (and since the motors were old), I upgraded to Nema 17 stepper motors from oozenest (118oz) and installed new belts. After the upgrade, I reprinted the part, and everything worked fine.

However, I started a 2-day print yesterday, and when I checked this morning, it had failed badly.

I didn’t record this print, but I assume the Y motor stopped again. When I cleared the material off the belts and tried to home the printer, the Y motor didn’t move, suggesting it was the cause of the failure. All the failed material had built up on the same side where the nozzle fell last time, reinforcing my suspicion that it was the same issue.

After turning the printer off and on again, the Y motor worked fine. I suspect the stepper motor driver is overheating, especially since the driver controlling the Y motor is the furthest from the cooling fan. The stock cooling looks inadequate, so I decided to install larger fans.

Issue 2: Cooling Fan Failure
To improve cooling, I installed bigger fans, wiring them in parallel to a buck converter outputting 12V.

(arguably I went overkill on the fans)

When I turned on the power, there was a pop, and now none of the fans work, and there is no output from the always-on fans either( I plugged in the buck converter and there is no output).

It appears that the fuse has blown. However, I can't remove the fuse—I've tried pulling it out, but it feels stuck, and I don’t want to damage the board.

Is there a specific way to safely remove this fuse?

So in summary, my questions are:

• Could the stepper motor driver overheating be the cause of my Y motor randomly stopping?
• What else could cause the Y motor to stop mid-print but work fine before the print when homing and after turning off and on the machine?
• How do I safely remove the 1a fan fuse?

Any advice or troubleshooting tips would be greatly appreciated!

Thanks in advance.

@droftarts Okay, I imagine it is cooling that is causing the issue as that driver chip is furthest from the fan which is definitely inadequate. Also after reading that post, the board has no airflow to the bottom, so that makes more sense. I will put it on some taller stand-offs tomorrow.

The fans are 12V/4.2W/0.35A, so two of them would be 0.7A, plus any other fans you have connected, may be quite close to 1A. I think fans also pull a bit more current at startup.

And I thought it was under 1 amp but I didn't think about the other fans, when the printer turns on the hot-end cooling fan kicks on for a second so the fans must draw more when the printer powers on like you said.

Are there any other pins where I can connect the fans to and not risk damaging the board? could I just connect the fans to the 24v VIN input into the board, I can't imagine this is the best way.

Here is a zip of my config. The board was running on software from 2017 when I started working on it last year. I had to start from scratch. I have not set up any macros yet as I never really use them so they are all default from the config generator.

bed.g
config-override.g
config.g
homedelta.g
pause.g
resume.g