Budaschnozzle repetier question

I bought the Budaschnozzle 1.2 to go on my pursa mendel reprap. Everything was working fine on my last hot end until I messed it up. I installed this new one and while the nozzle warms up, the temperature never shuts off. It is registering between 40-50°C. It is obviously hotter than that. Im not sure what the problem is.

Im using Repetier-Host along with the firmware.

Any ideas?



Edited 2 time(s). Last edit at 05/01/2013 04:43AM by mgarsteck78.

My guess would be a firmware OR repetier temperature setting that is off.

Did you check if you use the same thermistor in the new hotend? I doubt it, you should change that in your firmware settings.

seems like thermistor was not touching heated block. if so this is a main reason for failure. you can not monitor temp from ambient air.

Where would I look in the firmware? I cant find a heat table for this hot end

You need to set the thermistor type used inside the hot end, not the hot end type. See or ask theextruder vendor which thermistor he uses.

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'Where would I look in the firmware? I cant find a heat table for this hot end'

look at the top of the configuration.h section of the page. there will be comments to select a number for what type of thermister is used.

Its not the thermistor, but I think it is the firmware. Im not sure what the hell is going on.

I made this change:

#define EXT0_TEMPSENSOR_TYPE 7

and

#define GENERIC_THERM1_BETA 3974

Anything else I should do?



Im getting this readout for temp.

this seems odd, what thermister type came with your Budaschnozzle 1.2? from auctions on ebay i think it is a EPCOS 100k

is there a chance that one side of thermister is contacting the metal of the heatsink along with a resistor lead?

Edited 2 time(s). Last edit at 05/01/2013 10:05PM by jamesdanielv.

Im assuming its the Honeywell 100k

Im getting
Printer set into dry run mode until restart!
and
extruder 0: temp sensor defect

You get that when your temperature is outside the defined normal range. You get this
- if you have no thermistor connected to the defined pin
- you have a short in thermistor
- your thermistor type is wrong, also it is hard to get into that range with the wrong 100k thermistor.

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Ok then, so its a mechanical issue most likely?

No, i just saw you did
#define EXT0_TEMPSENSOR_TYPE 7

and

#define GENERIC_THERM1_BETA 3974

which is completely wrong. 7 is user defined table 3 not generic table 1 for which you would also need to do a
#define USE_GENERIC_THERMISTORTABLE_1
to activate it anyway. So basically your set table is nonse because you didn't define it.
If it is the epcos type set sensor type to 1

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Ok, I reverted everything back to how it was before. Set the table to 1 etc...

This is what Im getting.



Edited 1 time(s). Last edit at 05/02/2013 04:02AM by mgarsteck78.

So you are back at the beginning.

Have you checked what it shows at 25° room temperature. All 100K thermistors normally used have 100K at that temperature. So regardless of the changes at higher tems you should see 25°c for it.

You could also measure the resistance yourself. Have you checked that the budaschnozzle uses a thermistor and nor a thermo couple?

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It stays at the constant temperature no matter what the temperature in the room or if the hot-end is turned on or not.

The nozzle uses a thermistor and I did check the resistance with a multimeter. The resistance changed with temperature change, so Im assuming that the thermistor is working fine.

So the thermistor seems to work and the firmware does not see it.
Sounds like you didn't connect the thermistor where you told the firmware. You could test this. If you disconnect while running and connected you should see the dry run message appear. If not the thermistor is not at the defined pin number or something is wrong with that input. You could try the Extruder 2 input instead.

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Ok, I'll check that in the morning. Thanks a ton

I tried the test that you suggested. Nothing happened as far as temperature reading change or switching to dry-run mode when I unhooked the thermistor wire. I killed the job and disconnected my printer. I came back and the hot-end was still turned on, despite all of that.

Reading all this, makes me doubt if the cables are connected to the right corresponding pins on your controller.

Are you absolutely sure everything is in the right spot?

I dont think they are hooked up incorrectly.



Edited 1 time(s). Last edit at 05/04/2013 05:02PM by mgarsteck78.

How is the temp reading of your bed? Have you tried changing the two inputs and see if the readings are then correct? That way you could see if it is a problem with the ramps board.

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It still stays in that range of 50°C. Ill try swapping the pins.

swapped out the pins, nothing changed.

Oh, btw always turn off everything before swapping things!

I vaguely remember having the same issue before until I fixed my thermistor table. I got this information from studying the data sheet for the thermistor lulzbot includes in their 1.2 hotend.

// What type of sensor is used?
// 1 is 100k thermistor
.........
// 5 is userdefined thermistor table 0
#define EXT0_TEMPSENSOR_TYPE 5
........
/** Number of entries in the user thermistortable 0. Set to 0 to disable it. */
#define NUM_TEMPS_USERTHERMISTOR0 55
........
#define USER_THERMISTORTABLE0 {\
{46*4, 270*8*8},{50*4, 265*8},{54*4, 260*8},{58*4, 255*8},{62*4, 250*8},{67*4, 245*8},{72*4, 240*8},{79*4, 235*8},{85*4, 230*8},{91*4, 225*8},{99*4, 220*8},{107*4, 215*8},\
{116*4, 210*8},{126*4, 205*8},{136*4, 200*8},{149*4, 195*8},{160*4, 190*8},{175*4, 185*8},{191*4, 180*8},{209*4, 175*8},{224*4, 170*8},{246*4, 165*8},{267*4, 160*8},\
{293*4, 155*8},{316*4, 150*8},{340*4, 145*8},{364*4, 140*8},{396*4, 135*8},{425*4, 130*8},{460*4, 125*8},{489*4, 120*8},{526*4, 115*8},{558*4, 110*8},{591*4, 105*8},\
{628*4, 100*8},{660*4, 95*8},{696*4, 90*8},{733*4, 85*8},{761*4, 80*8},{794*4, 75*8},{819*4, 70*8},{847*4, 65*8},{870*4, 60*8},{892*4, 55*8},{911*4, 50*8},{929*4, 45*8},\
{944*4, 40*8},{959*4, 35*8},{971*4, 30*8},{981*4, 25*8},{989*4, 20*8},{994*4, 15*8},{1001*4, 10*8},{1005*4, 5*8},{1021*4, 0} } //safety

Ladies and gentlemen, we have a winner!

Thank you so much to everyone for helping me out!

Edited 1 time(s). Last edit at 05/04/2013 10:55PM by mgarsteck78.

So, what was the solution?

The heat table that was proposed above.