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Help needed with i3 mk3 build problems.  

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mark.c20
(@mark-c20)
Active Member
Help needed with i3 mk3 build problems.

I have just built my first 3D printer, the i3 mk3, and I can't get it going. Updated firmware to 3.1.2.

We start the wizard and it checks the fans OK, the XYZ axes all pass and it then heats the hotend and the bed just fine. Next it fails saying filament sensor wiring faulty. I have checked the wiring and it is fine so I guess the sensor is the issue. The filament sensor status is 'not responding'.

I then decided to move on and do a full XYZ calibration and the Z axes which passes in the wizard now fails immediately??? The printer homes X and Y and then rises to the top, it stalls (I assume to level the motors) and then it comes back down. It gets to the bottom, the LED goes out on the PINDA probe and it immediately says that it failed and check the axes. The PINDA is so sensitive that lightly press down on the bed turns the LED back on and it stays on and lightly press up does the reverse. It seems perfect but it is not happy.

Sorry if I am missing something and if you want pictures or video please ask.

Thanks
Mark C

Posted : 06/03/2018 6:18 pm
mark.c20
(@mark-c20)
Active Member
Topic starter answered:
Re: Help needed with i3 mk3 build problems.

OK for the benefit of other new comers the Z axes was my mistake. I didn't seat the extruder far enough in the housing and therefore the PINDA was to far out of the housing as well. The result was the PINDA sensor saw the bed about 6mm to soon and that machine didn't like being 6mm shorter than it should be. With the extruder seated in properly and the PINDA reset it passes calibration perfectly.

While I had it all apart again I double checked the filament sensor and that is seated just fine but it will not play. Sensor is not responding is all you get, any ideas....

Posted : 06/03/2018 10:19 pm
brian.w26
(@brian-w26)
Active Member
Re: Help needed with i3 mk3 build problems.

I just built my first 3D printer as well and had a few hiccups. But here is what I know about the sensor.

Make sure the PTFE tube that sits next to the sensor is barely in the hole, do not push it all the way down in, it needs to be mostly sticking out. I pushed it all the way in by accident, which caused intermittent sensor fails and then I took it out and put it back in and it caused a sensor failure. I believe I damaged the sensor, ordered a new one and will see what happens. I did finally consult the updated manual informaiton online, and it says (as a side note) you should install the PTFE in the cover first which helps prevent the issue of installing to far in the sensor hole.

If you touched the sensor or the face of the board it sits on, this may have caused the issue, but i am not sure if you can clean it.

Posted : 12/04/2018 8:56 pm
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