I had to replace the wiring completely from the thermistor to the board and ditched all the plugs and nonsense.
After correcting that issue, I had nearly the identical issue with the extruder itself... so I replaced the wiring in
the same fashion.  I ditched Repetier Host and switched to Simplify3D for slicing.  I got VERY tired of fiddling constantly
with the settings in RH trying to chase good prints... it reminded me of the old RepG for the Makerbot which drove me crazy.

As I type this, the machine is back up and running smoothly and producing nice parts again...

Customer service did send me a thermistor... but I had already purchased 2 from eBay... so now I have spares.

and the experience will help me next time I have that same issue....

Cujo

Dear cujo3131

I have been getting the same errors. My new printer is right out of the box.  I unplugged and shut everything down. I did not get the same problem.  The machine started to print but nothing stuck to the bed just got a blob at the end of the extruder moving around the print bed.  The most recent print try gave me the same RH stop that ggunners got (I hate win8 and now I have another reason).

Richard

http://www.soliforum.com/topic/1889/the … gs-around/

I have been getting the same errors. My new printer is right out of the box.  I unplugged and shut everything down. I did not get the same problem.  The machine started to print but nothing stuck to the bed just got a blob at the end of the extruder moving around the print bed.  The most recent print try gave me the same RH stop that ggunners got (I hate win8 and now I have another reason).

Richard

1) Check the two wires with small Teflon tube at the end of thermistor head are not touched together,
     or use a thin Kapton tape to isolate them.
2) Tape the thermistor' head directly to a flat surface of brass nozzle tightly, but don't let any wire
      to be bare and touch alum. heating block or brass nozzle.
3) Check related connections.
4) Set extruder temp. 210 C, don't set 215c, etc.
Then you can print a small part, and go on.

After moving to another wall plug and trying another power strip...
and double checking the plug (a third time)...

It seems to now be working.... I have no idea why... or what happened...

But was able to print a 20mm test block with no incidents.....

Go figure....

By the way cujo, that was an outstanding post. It sounds like the main board's extruder stepper driver has failed.

- It worked as if it was the Z axis.

I unplugged that and then plugged the Z Axis motor into the Extruder port... gave an extruder movement.

- Nothing happened

******************************

Currently rebooting computer and doing another cold restart...
also have changed to different wall receptacle and changed powerstrip.
will let you know if anything changes....

Step 1.  Plugged in USB to computer then to SD3 Board - Computer acknowledges USB connection and green indicator light   
comes on SD3 board.

Step 2. Plug in power cord to surge protector power strip then into SD3 - Lights come on in SD3

Step 3. Opened RH (V0.85b) and connect to SD3

RH connects to SD3 without error and displays the following message:

At startup with RH, there is both a Extruder Temp (17.50) and a Bed Temp (15.60)

Using Manual Control, I activate extruder and allow it come to temp.  Extruder takes 3 minutes to come to temp of 200 degrees and levels off after running for about 3 minutes.  Allowed extruder to continue to heat for another 5 minutes and observed temp for spikes or falloff.   None were observed on graph. 

- Physically checked extruder and yes, it is heating and hot to the touch.

- At NO time during this process did the fan on the extruder motor come on or run. 
I corrected this by running a new wire from the plug at the board to the fan.  Works fine now.

- There were NO errors noted in the log screen.

- Deactivated extruder.

Using Manual Control, I activated build plate and allowed it to come to temp.  Build plate took approximately 9 minutes to come to temp (95 degrees) and leveled off.  Print bed was allowed to run for 10 minutes and was observed.

- Physically checked build plate and yes, it is heating and hot to the touch.

- At NO time during this process was there any major spikes or dips in the temp.

- There were NO errors noted in the log screen.

- Deactivated Build Plate.

Using Manual Control, I used the HOME BUTTON to return Built Plate and Extruder to their starting positions.  I then moved both X, Y, and Z axis  in a variety of motions (front to back, side to side, up and down)

- There were NO errors noted in the log screen.

- All axis moved and performed as they should without any incident or hesitation.

Using Manual Control and the code M302, ( with NO strand in the Extruder) I attempted to both Extrude and Retract.

- There was no movement by the motor at all in either direction.

- Checked the plug at the extruder motor and at the control board to make sure both were correctly plugged in.

-  Attempted a 2nd movement in both directions and again nothing.

*********************************************************************************
At this time the ONLY change to the printer from its original setup when I received it is:

- Replaced Thermistor with a 100K Compact High Precision Glass Thermistor from Analog Technologies
(Part # ATH100K1R25T70)

- Used a New wire from Thermistor to the board  (Original is still there, but not in use)

- Replaced the wire from the fan to the plug at the board.

**********************************************************************************

In regard to the "flipping" thing.  I swapped the extruder plug on the board with Z axis plug just to see if
the motor was ok.  It was... and worked fine.  I put all plugs back their original positions.

I am going to completely shut down the printer... unplug power/USB.... try a different wall plug and power strip to
see if that perhaps makes any difference.

I hope that is detailed enough for you and makes everything clear now.

Matt

He said he gets good temps now and ran new wiring, and that the extruder isn't moving, though it does move when he swaps with the Z-axis.

My understanding was he only wired from the thermistor to the plug next to the hot end. From that plug to the electronics are therefore original.

Both bits of wiring (thermistor and heater) for me were rubbish. They can't stand up to the stress and strain of flexing and moving as the extruder travels around.

Pretty sure this is the board that I have onboard....

Look at that wiring - it is reversed on the extruder motor. That is fine, you should not have flipped yours.

You really need one clearly written post with the current state of affairs, in english, with capitalization and proofreading.

Start with everything totally unplugged.
Plug in USB to computer/printer
Plug in power to printer
Open RH
Heat thermistor - does it start heating? Verify by touching the hotend briefly. Does it stabilize at your set point?
Click the manual extruder arrow. Is there any motion at all or sounds?

I think Elmoret has given up telling you so I will take over.

You most likely have some dodgy wiring between the thermistor plug and electronics board. Probably a partially broken wire that loses connection for a split second as the print head moves and makes it pull an flex, hence intermittent problem.

Rewire it.

I had a similar thing at a similar stage. The factory wires and plugs in my opinion are pretty sub-standard. I had the heater wires for the hot end start to intermittently fail. Within 24 hours of replacing them, the thermistor wires failed too.

I replaced both with good quality cabling and soldered and crimped JST connectors. Zero problems in the 1-2 years since.

He said he gets good temps now and ran new wiring, and that the extruder isn't moving, though it does move when he swaps with the Z-axis.

Have you power cycled and USB cycled (unplug/replug) the printer?

You most likely have some dodgy wiring between the thermistor plug and electronics board. Probably a partially broken wire that loses connection for a split second as the print head moves and makes it pull an flex, hence intermittent problem.

Rewire it.

I had a similar thing at a similar stage. The factory wires and plugs in my opinion are pretty sub-standard. I had the heater wires for the hot end start to intermittently fail. Within 24 hours of replacing them, the thermistor wires failed too.

I replaced both with good quality cabling and soldered and crimped JST connectors. Zero problems in the 1-2 years since.