• Marlin always includes safe min and max temperature ranges which * protect against a broken or disconnected thermistor wire. * * The issue: If a thermistor falls out, it will report the much lower * temperature of the air in the room, and the the firmware will keep * the heater on.
  • // 4 is 10k thermistor !! do not use it for a hotend. It gives bad resolution at high temp. !! // 5 is 100K thermistor - ATC Semitec 104GT-2 (Used in ParCan & J-Head) (4.7k pullup) // 6 is 100k EPCOS - Not as accurate as table 1 (created using a fluke thermocouple) (4.7k pullup) // 7 is 100k Honeywell thermistor 135-104LAG-J01 (4.7k pullup)
  • The main change is for the TEMP_SENSOR_0. It needs to be 11. This is the entire reason of doing all of this is to simply get the tables for the NTC 3950 thermistor to work. I am sure you could just replace the tables in the Robo3D firmware, but I found it easier to replace the settings in the newest Marlin firmware.
  • Pressure Conversion Tables: RH vs. Temperature: Sheet Metal Thickness: Steam Tables: TC & RTD Tables: Thermistor Tables: Water - Properties: Wire Tables - Size, Capacity, Resistance of Copper Wire: YSI 400 Series Medical Probes - R vs. T Table: Publications and Organizations: Publications and Organizations of Interest to Technical Professionals
  • * * The issue: If a thermistor falls out or a temperature sensor fails, * Marlin can no longer sense the actual temperature. Since a disconnected * thermistor reads as a low temperature, the firmware will keep the heater on.
  • Report here's the thermistor table for the thermistors with a beta of 3950, 100k ohm type. These can usually be found for really cheap on ebay and such, but finding the table for marlin firmware is a bit difficult so here it is, just replace type 8 with this code in thermistortables.h.
  • After this I’ve checked the firmware code, especially the thermistor config where you could choose between the different sensor types/value tables and founded the issue: The Thermistor in the Hotend is an axial DO-35 type so it should be number ‘10’ but its configured by default as number 5 which is for radial Thermistors like NTC-0,2 etc. .
  • Nov 01, 2017 · I finally sorted these problems out (by editing Marlin and importing missing definitions into the thermistor table) and am now printing with Titan, V6 and a hardened nozzle at 325*C. Tip for those who want to print real polycarbonate - use really thick PEI and heat the bed to 145*C (you'll need a SSR setup - and a 120v AC silicon heater).

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This thermistor comes with ptfe tubing on its connectors and 1m long leads attached to it. Only 2 left in stock. ... Marlin Settings table can be found in:
Dec 31, 2017 · Thermistor Replacement - Heatbed. ... Table of Contents. Hardware. Steps per unit. ... Hardware. Economy metal structure 3D printer. Marlin instruction set compatible ...

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// 4 is 10k thermistor !! do not use it for a hotend. It gives bad resolution at high temp. !! // 5 is 100K thermistor - ATC Semitec 104GT-2 (Used in ParCan & J-Head) (4.7k pullup) // 6 is 100k EPCOS - Not as accurate as table 1 (created using a fluke thermocouple) (4.7k pullup) // 7 is 100k Honeywell thermistor 135-104LAG-J01 (4.7k pullup)

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Some of the figures in that table are misleading, and some are plain wrong: Thermistor resolution "Up to 0.16°C" doesn't mention that for a wide-range thermistor, the resolution is likely to drop to 10C or even worse towards the extremes of the range.
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