feedback temperature

[smedsgenbo 0]

Hi, and Happy new year all.

How does the temperature feedback work? I'm curious because I'm always off the rest of you regarding temperature.

I have to remind you that my printer is a KorBot but should not be a lot different from the UM2.

I live in Singapore. Ambient temperature is almost constantly 29 - 33 Celsius in the room where the printer resides. Thinking that the KorBot is out of Korea, and generally UM2 is also from non tropical zone, does that make any influence in how the temperature feedback is computed in the firmware? ? Not sure how to describe it either.

A normally good looking print with PLA is 245 nozzle temp, 75 bed temp, 100-120mm/sec and fan off the first couple of layers, then half speed the rest of print. And yes, it's Cura slicing software for the KorBot too. I can't make up my mnd wether to us UM or Marlin settings, but definitely not sure reprap or whatever the last solution is.

Thanks for a great insight.

BR, Daniel

[pm_dude 27]

Hi Daniel,

The high temp you are showing could be because you are printing so fast. I can hardly believe the filament stick well on the bed at that speed. Two missing variables is the layer height and nozzle size since it will affect a lot the volume that is outputted from the nozzle.

The size of the heater block and the length of the nozzle are a big factor in the temp to use. For example the UM1 and the UM2 have a big difference in the size of the heater block which change the possible volume output for the same temperature.

Moisture could be a factor too.

I usually print with the bed no more than 60C for PLA. At 75C you might get the base of the print to cave in a little. http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#wallcavein

On the UM2, I print around 200C most of the time but also usually print around 30-40mm/s at 0.1mm layer height.

 

[smedsgenbo 0]

Well. Hmm. Thanks for the link. I read through it all and didn't really think it was worth it.

Yes. I print as fast as possible. My printer differs from Um2 mostly by structure. There may be more to it!

I currently don't agree that lowering the temperature is the best option and said in the same line, I would rather try to keep the speed up and think of adjusting the model to fit the printer.

Much as I'm used to from my engineering background.