dfh.fm

Thermistor 100K ohm NTC 3950

$2.00
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100K NTC 3950 thermistor for 3D-printer hotends and heated beds. A common RepRap-style temperature sensor with 100KΩ resistance at 25°C, B25/50 3950K, and a 1m lead for replacing or building a standard printer temperature input.

Why use this thermistor

  • Firmware-friendly spec: 100K NTC / B3950 is one of the standard thermistor profiles used across Marlin, Klipper, and RepRap-style printer builds.
  • General hotend or bed sensing: use it where your controller and firmware expect a 100K B3950 NTC sensor.
  • 1m cable: enough reach for most toolhead and small heated-bed wiring paths without adding an immediate splice.

Specifications

  • Sensor type: NTC thermistor
  • Nominal resistance: 100KΩ at 25°C
  • B-value: 3950K (B25/50 family)
  • Cable length: 1m
  • Use case: 3D-printer hotend, heated bed, chamber, or general temperature-sensor input where a 100K B3950 thermistor is specified

Fitment notes

  • Works as a replacement sensor for printer builds configured for a 100K NTC 3950 thermistor.
  • Pair it with a 24V 40W heater cartridge when rebuilding a standard hotend heater block.
  • For higher-temperature hotends, compare against the HT-NTC100K high-temperature thermistor before choosing this standard sensor.

What it is not

  • Not a PT100 or PT1000 RTD sensor; use firmware settings for 100K NTC B3950, not RTD settings.
  • Not a cartridge-style thermistor unless your heater block accepts this probe style.
  • Do not use it above the temperature limit of your specific sensor construction, wire insulation, or connector.
Shipping & Returns

Returns:

Thank you for purchasing from dfh.fm. I want you to be completely satisfied with your purchase. If for any reason you are not satisfied, you may return your purchase within 60 days of the original purchase date.

Defective items: Please inspect items upon receipt. If you receive a defective item, you may return it for a full refund or replacement within 90 days of the original purchase date. Please contact me to initiate a return for a defective item.

Non-defective items: If you are not satisfied with a non-defective item, you may return it for a refund within 30 days of the original purchase date. A 20% restocking fee will be deducted from the refund amount, to offset the time and inconvenience, as I am the sole employee processing the return and restocking the item. The fee also covers the costs associated with processing the return. Refunds for non-defective items will be issued through the original payment method.

Preordered items: Due to the nature of preorders, delivery dates are subject to change. Please keep in mind that, If you have preordered an item, it is not eligible for a refund until after it has arrived at the store. Once the item arrives at the store and is inspected, you may request a refund within 30 days of the original purchase date. Please note that refunds for preordered items may take up to 10 days to be issued.

To initiate a return, please open a ticket on the shop’s discord channel, with your order number and the reason for the return. We will provide you with further instructions on how to return your purchase.

Thank you for shopping with us. If you have any questions or concerns, please don't hesitate to contact me, via Discord.

Order alterations and cancellations:

Once an order has ben submitted, no alterations can be made. This includes adding or removing items or canceling orders. You are welcome to return an order, once you have taken receipt, following the returns procedure listed above.

Shipping:

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International shipping is mostly UPS, as I utilize Zonos/UPS integration to tally extremely accurate import and shipping costs. 

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If there is a problem with an international order, it is my choice to refund part or all of the order, or send a replacement. 

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