The NuggetNinja (Or anyone else) Needs help with their 3-D Printer thread

Communities Science, Engineering, & Security
1

So, this thread is similar to the small linux problem thread. I am making it because I recently got a 3-D printer and do not know everything there is to know. If you are going to post a problem I suggest you mention the printer.

I currently have a Pursa i3 mk 2. In the process of calibration, this started happening.
https://www.youtube.com/watch?v=tU75zdX5NpU
Sounds like gears grinding for some reason. Any help is appreciated.

2

did you post youtube link?

I'm not seeing anything...

3

I did, let me try to fix it.

4

I think the expanded link display for youtube links is one of the many things that got borked by the move.

You can just use [url] tags

1 Like
5

AH, got it. I have some ideas.

1 wire is disconnected on the motor in question. Stepper motors rattle back and forth like that when only 1 coil is getting engaged.

6

It only does that in that part of the axis.

7

oh... in that case check that the teeth on the belt are ok.

8

I dont see anything wrong with any of the teeth.

9

Check all of that belt for any grit that may jam it in that spot.

Can you take a vid closer to motor and from the other side?

I'm wondering if it's the motor spazzing or the belt/mechanism failing.

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https://www.youtube.com/watch?v=CNTfAHImFko
https://www.youtube.com/watch?v=5m7b6Vvy2N8

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Unless there's something physically blocking it from moving (and thus stalling the motor), the motor is behaving exactly like only one coil is being powered.
This could be from a number of different things:

  • Faulty motor driver (the circuit board)
  • poor wire connection
    • check plugs are seated fully
    • use continuity checker (multimeter) and move wires around to find if there's a break inside the wire. (very unlikely but is a possible solution)
    • check where wires go into motor housing... any sign of damage? They could be lose inside housing.
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I have started looking, dont have the multimeter with me so I cant do that, I do remember this not being an issue when I first put the printer together.

I dont see any look connections or damage.

1 Like
13

So it turns out the printer only does that when auto calibrating the bed. I cannot get it to do that any other time. At all. Period.

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That's really weird...

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I know. Im trying to re calibrate the axi and see if that does anything. I might have actually found the problem. Two zip ties that werent cut short enough. I've done it before on this printer.

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Where they blocking something?

17

The first ones were making two screws not go all the way down making the bed unlevel

Looks like it magically fixed itself.