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I found that people use fiberglass insulators. However I am now using some PTFE (teflon) tube, affixed the thermistor with CA glue and an M2 screw on the other end holds it into the heating block,...

I am having to replace thermistors as well. I have just the bare thermistor so am going to need to insulate it. A lot of materials degrade at that temperature, also it needs to conduct the heat, I am...

Great, if you use the supports they will also work for the holes.
The zigzag option in Cura with 12-15% covering is best for easy breakaway.
I would design supports only for very specific cases...

The infill can be related to your wall thicknesses not being a multiple of your nozzle size. So that it will venture in between two walls to fill in that tiny gap. The overall gap over the entire...