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Hotend Heater and temperature sensor on a UM2

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You only need to replace the temp sensor if you cannot get the old one out in one piece.

there is sometimes a bonding between the cartridge og the tempe sensor and the olsson block, or if there has been a plastic leak (before) where the plastic has entered the block and has glued itself to the temp sensor.

If you have an UM2, the heater is rated at 25W. Sometimes they have less. You can OHM it with an ohm-meter. Should read 25 ohm or less. more than 25 ohm = less than 25 watt.

The heaters are very good quality and rarly need replacement. The 25 W heater will give you trouble of you print at high temperature (220-225+) and suddenly the fans come full on.

The Temp sensors from UM are also good quality, but by the nature of their construction they are more fragile; tiny little leads and a microscopic platinum sensor inside make them more easy to break, unfortunately.

It can be useful to tell cura to put the fans on gradually and early. check in expert settings.

A higher wattage heater, like the one standard in UM2+ will be able to withstand a sudden fan increase better or every time.

The Um2+ upgrade kit from UM has the 35W heater and will annule any fan-suddenly-on problems.

The Heater is allmost always easy to remove from an old block to put into a new one, because it sticks out a bit and can be grabbed by an instrument to be pulled out.

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