Marlin temperature settings We have the following problem, The heater of the 3D printer 12v- 40w gets hot only after warming the thermistor manually above 5 degrees. After we heat it up manually there is no problem and we can print. However when we don't manually heat up the Thermistor then it will not heat up at all. The electronics and the 100 NTC G540 (thermistor) and extruder work like a charm after the manually heating so they are fine. We already have replaced the RAMPS 1.4 and the Thermistors with new ones. The temperature in Pronterface and on the LCD screen are the same as we measure with an IR temperature meter. When we don't manually heat then in Pronterface we can't activate the temperature and it shows T 0/0. When I change the settings in Marlin to #define HEATER_0_MINTEMP 0 it still doesn't heat up. We have tried 4 different Thermistors and they all gave the same result so that's not it. When we use these settings nothing works unless we pre-heat manually. #define HEATER_0_MINTEMP 5 #define HEATER_0_MINTEMP 5 #define HEATER_0_MINTEMP 5 #define BED_MINTEMP 5 I hope someone here has some suggestions on how to fix this problem it must be some Marlin setting that we have to change or can it be Pronterface? Thanks in advance https://reprap.org/forum/read.php?146,547503,547503#msg-547503 Fri, 17 Apr 2026 12:38:18 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?146,547503,549949#msg-549949 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,549949#msg-549949 ray23 Firmware - mainstream and related support Tue, 25 Aug 2015 12:36:39 -0400 https://reprap.org/forum/read.php?146,547503,548243#msg-548243 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,548243#msg-548243 ray23 Firmware - mainstream and related support Fri, 21 Aug 2015 07:41:39 -0400 https://reprap.org/forum/read.php?146,547503,548240#msg-548240 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,548240#msg-548240
Quote
ray23
@Wurstnase it wasn't 100 but 90 my bad sorry about that.

:S

It should be >90000 Ohms at room temperature!]]> Wurstnase Firmware - mainstream and related support Fri, 21 Aug 2015 07:37:13 -0400 https://reprap.org/forum/read.php?146,547503,548234#msg-548234 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,548234#msg-548234 ray23 Firmware - mainstream and related support Fri, 21 Aug 2015 07:26:59 -0400 https://reprap.org/forum/read.php?146,547503,548224#msg-548224 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,548224#msg-548224 Wurstnase Firmware - mainstream and related support Fri, 21 Aug 2015 06:37:35 -0400 https://reprap.org/forum/read.php?146,547503,548220#msg-548220 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,548220#msg-548220
@ wurstnasse We don't have a PT100 (I'm not sure what you mean by this :S) we use a Epcos 100k and connect this to the pins on the ramps4.1]]> ray23 Firmware - mainstream and related support Fri, 21 Aug 2015 06:30:46 -0400 https://reprap.org/forum/read.php?146,547503,548214#msg-548214 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,548214#msg-548214 Frans@France Firmware - mainstream and related support Fri, 21 Aug 2015 06:17:17 -0400 https://reprap.org/forum/read.php?146,547503,548168#msg-548168 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,548168#msg-548168
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RGN01
Ray23, if you can't get the right thermistors in Holland, what about one of these? [e3d-online.com]

Richard
Achatz in Holland should have the right thermistors, too.

Beste Groeten
Olaf]]> o_lampe Firmware - mainstream and related support Fri, 21 Aug 2015 03:24:08 -0400 https://reprap.org/forum/read.php?146,547503,548167#msg-548167 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,548167#msg-548167 But maybe they sent you something else, because a standard 100k thermistor would read around 80k-90k at room temperature, not "100"
-Olaf]]> o_lampe Firmware - mainstream and related support Fri, 21 Aug 2015 03:22:20 -0400 https://reprap.org/forum/read.php?146,547503,548146#msg-548146 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,548146#msg-548146
Quote
ray23
@ Olaf When I hold the thermistor between my fingers I will get 5°C maximum.
I can confirm that R22, R21, R11, R1 and R7 are 4.7kOhm and the resistance is 472.
The resistance of the thermistor when not connected is 100

Do you try to use a PT100 directly on your board? That will not work.]]> Wurstnase Firmware - mainstream and related support Fri, 21 Aug 2015 02:31:24 -0400 https://reprap.org/forum/read.php?146,547503,548016#msg-548016 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,548016#msg-548016 ray23 Firmware - mainstream and related support Thu, 20 Aug 2015 16:17:01 -0400 https://reprap.org/forum/read.php?146,547503,548012#msg-548012 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,548012#msg-548012 e3d-online.com]

Richard]]> RGN01 Firmware - mainstream and related support Thu, 20 Aug 2015 16:06:34 -0400 https://reprap.org/forum/read.php?146,547503,547965#msg-547965 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,547965#msg-547965
@ Olaf When I hold the thermistor between my fingers I will get 5°C maximum.
I can confirm that R22, R21, R11, R1 and R7 are 4.7kOhm and the resistance is 472.
The resistance of the thermistor when not connected is 100

Thanks for your help guys I really appreciate it.]]> ray23 Firmware - mainstream and related support Thu, 20 Aug 2015 14:23:06 -0400 https://reprap.org/forum/read.php?146,547503,547871#msg-547871 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,547871#msg-547871 Can you confirm your Ramps boards have 4.7kOhm resistors populated? ( three resistors beside the capacitors at the thermistor ports stamped "472" )
What is the resistance of the thermistors when NOT connected to the Ramps?
-Olaf]]> o_lampe Firmware - mainstream and related support Thu, 20 Aug 2015 10:38:27 -0400 https://reprap.org/forum/read.php?146,547503,547794#msg-547794 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,547794#msg-547794 reprap.org]

Or if you have the specs you might calculate them:
Example spreadsheet [www.thingiverse.com]
or [github.com]
or Nophead's blog entry [hydraraptor.blogspot.fr]]]> Frans@France Firmware - mainstream and related support Thu, 20 Aug 2015 07:24:03 -0400 https://reprap.org/forum/read.php?146,547503,547734#msg-547734 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,547734#msg-547734
@ Olaf We also don't understand why the thermistor doesnt give us room temperature (20°C no icehouse ;-) in Pronterface.
We have chosen setting 1 and all the others already and no result.
The boardtype is 33 EFB

We have placed the hermistors on
T0 extruder
T1 heatbed

The heatbed also gives 0 in Pronterface.

I'm puzzled what can cause this problem because we already have replaced the ramps 1.4 and the thermistors so they can 't cause the problem.

I hope you have some more suggestions thanks]]> ray23 Firmware - mainstream and related support Thu, 20 Aug 2015 04:26:11 -0400 https://reprap.org/forum/read.php?146,547503,547700#msg-547700 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,547700#msg-547700 The 100 NTC g450 isn´t listed in the marlin setting, so choose type 1 for starters.

What temp does the bed thermistor show in pronterface?
Did you define the right board type in marlin? ( 33 is EFB )
Did you use the right pins for the thermistors? (Above the z-stepper connectors)
-Olaf]]> o_lampe Firmware - mainstream and related support Thu, 20 Aug 2015 03:12:18 -0400 https://reprap.org/forum/read.php?146,547503,547617#msg-547617 Re: Marlin temperature settings https://reprap.org/forum/read.php?146,547503,547617#msg-547617 Frans@France Firmware - mainstream and related support Wed, 19 Aug 2015 19:48:23 -0400 https://reprap.org/forum/read.php?146,547503,547503#msg-547503 Marlin temperature settings https://reprap.org/forum/read.php?146,547503,547503#msg-547503
The heater of the 3D printer 12v- 40w gets hot only after warming the thermistor manually above 5 degrees. After we heat it up manually there is no problem and we can print. However when we don't manually heat up the Thermistor then it will not heat up at all. The electronics and the 100 NTC G540 (thermistor) and extruder work like a charm after the manually heating so they are fine. We already have replaced the RAMPS 1.4 and the Thermistors with new ones.
The temperature in Pronterface and on the LCD screen are the same as we measure with an IR temperature meter.
When we don't manually heat then in Pronterface we can't activate the temperature and it shows T 0/0.


When I change the settings in Marlin to #define HEATER_0_MINTEMP 0 it still doesn't heat up. We have tried 4 different Thermistors and they all gave the same result so that's not it.

When we use these settings nothing works unless we pre-heat manually.
#define HEATER_0_MINTEMP 5
#define HEATER_0_MINTEMP 5
#define HEATER_0_MINTEMP 5
#define BED_MINTEMP 5

I hope someone here has some suggestions on how to fix this problem it must be some Marlin setting that we have to change or can it be Pronterface?

Thanks in advance]]> ray23 Firmware - mainstream and related support Wed, 19 Aug 2015 13:19:10 -0400