@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

@Notepad There is no cooling where the relay was, so sounds like a heat failure then.

I am going to order a new one but I can only find them on ebay, I found a heat sink and will install a fan on that as well.

I am also going to install a 128 degree c fuse. What's the best method to attach this to the bed ?

Would it be possible to use something like This?

or would this be worse?

Thank you for your help

@JJJJ Just to add, the bed heats up the second its connected to power, even when the printer is turned off

Hi everyone,

I was calibrating my Tractus T1250 and was just about to start a print when I noticed the bed was heating above the set temperature.

Issue Description:
I turned off the heater, but it kept heating.
It reached 90°C, so I powered everything off.
After cooling down, I turned it back on — same issue: bed kept heating uncontrollably.
I then unplugged the bed power terminals and powered it on again — the temperature started rising again.

Setup Details:
The bed is powered by a SSR-100 DD Relay.

The power supply plug splits into two:
One pair goes to the 24V input on the board.
The other pair powers the bed.

Bed Wiring:
Positive from PSU → directly to the bed.
Negative from bed → terminal 2 on SSR.
Terminal 1 on SSR → back to PSU negative.
Terminal 3 → positive bed terminal on the board.
Terminal 4 → negative bed terminal on the board.

Troubleshooting:
Continuity between terminals 1 and 2, but no continuity between 3 and 4.
I suspect the relay has failed and plan to order a new one.

Questions:
Has the relay failed?
Is this wiring correct? This was the stock setup, but it doesn’t feel safe.
Is there a failsafe I can add to prevent overheating and potential fire risk if the relay fails again?
What could cause the relay to fail?
Could it be due to lack of cooling or overheating during normal operation?

Thanks in advance for your help!

@droftarts Okay, the first couple were probably static, I have been wearing a fleecy jumper, and every time is an exaggeration it was like three times throughout the day.

checked the power supply input cable and nothing looks like it's loose or touching anything it shouldn't.

The motors are mounted directly to the frame.

And that's very exciting, I hope yours is less of a headache aha!

My other question was about remote monitoring. is there an easy way to do this? I saw an article on the duet website but wanted your opinion.

Thanks again
Jake

@droftarts Today i changed the fuse and the fans are working again, but I keep getting shocked everytime I touch the red frame of the printer.

I unplugged it just now and went to touch it to change the wiring to add the fans and got the worst shock so far.

Would you know what is causing this/how I stop it and should I be concerned.

Thanks

@droftarts

Sorry, I missed this earlier on. What did you wire the 12V buck converter to to get power? The fan header? You can get power for it directly from the 24V PSU, wired to VIN+ and GND for always on. You could wire the negative to one of the FAN#- pins to make it controllable. Heaters and fans switch on the negative side (it's how MOSFETs work), so the positive side is 'on' all the time.

yes, I did, I will just wire straight into this then as I need these fans on all the time, thanks.

Great, thanks! Would you happen to have the original Tractus3D configs around, even if they are for older RRF versions? Otherwise, they now appear to be lost to the mists of time.

Unfortunately not, I forgot to save before I updated and I corrupted the original config, hence why I had to start from scratch.

@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

@droftarts Thanks for your reply. That makes sense about the spam, here is the link to the video: https://youtube.com/shorts/F0TtCY8WHq0?feature=share

Yes. Particularly if you have the current turned up, the motor drivers can overheat. Depending on what version of RRF you are running, you may be able to detect a driver error event and pause, see https://docs.duet3d.com/en/User_manual/RepRapFirmware/Events

The stepper motors are at 1.8 amps, I naively thought to set the current to 90% of what the motors can handle. their max current is 2 amps. But I imagine this is too high for the drivers then. I am going to order some heatsinks for the motors as well.

The motors: https://ooznest.co.uk/product/nema17-stepper-motors/

I am currently using version 3.5.1. I was going to ask how to set up a failsafe to prevent more failures like this before they get to a dangerous position and wasted filament.

Not much, unless there's a wiring issue. It may take a while for the driver/board to heat up.

Both failures happened a good few hours into the print so that makes sense.

The 1A fuses aren't common. You can use a 2A (which are generally more available), but I wouldn't use much more. See https://docs.duet3d.com/en/User_manual/Troubleshooting/Parts#blade-fuses

I have ordered some 1 amp fuses online as the lowest we have is 5 amps, but I put the fuse in and now I am getting continuity between the VIN and the v fan junction pins.

Would the fans I used cause the fuse to blow? the polarity was correct.

Thanks again for your reply.

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

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.