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Temperature readout difference between UMO and UMO+

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Hi guys,

I noticed something lately. I have 3 old UMOs with the thermocouple board on the printhead, the other 4 UMO+s have the sensor (PT100?) attached directly to the main board.

When I print the same gcode file on both types of printers, I get different results. The UMO prints Colorfabb PLA/PHA at 220ºC without stringing and with a smooth but matte top layer. The UMO+ prints with same settings, but there is significantly more stringing and blobs. Also the top layer is a lot more shiny. When I lower the temperature manually to around 200-205, the prints look a lot more like the older UMOs.

I want to do a comparison between the readout of the sensors, but I have to find/make some kind of heater block where both sensor fit in together.

Does someone have an explanation for the difference in print quality? Is the temperature readout wrong on one of the machines?

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I always had to print a bit hotter on the UMO compared to the UMO+

I have no tool to calibrate accurately, so I don't know which one is wrong, but I did the same observation...

As I had recently troubles with the UMO thermocouple amplifier I replaced the sensor by a PT100 and the E3D amplifier. I have now more consistant temperature reading between both printers.

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