buildlog.net

... and here is the first test result:


The circle is almost perfect, I 'll do more tests in order to eliminate the lack of plastic at the left.

Good news, Flurin, the circle looks so smooth, mine is segmented.
With my extruder, the gaps right after the layer change were corrected by playing with the retraction parameters, after I made sure the plastic flow was right by measuring the wall thickness, but your case may be different.

What was the speed setting for that print?

Feed Rat = 150 mm/s (Gcode F9000)

Here is my best result so far:



Because there is a possible bug (Randomize starting points dosen't work) in the Version 0.8.4 of slic3r I used the old Version 0.8.3.

Printing-data: same as above.

That's a lot better and up to speed.

I printed your gcode with my Hadron and came out great, the circle printed very smooth too, only the walls came out 0.38mm thick, about 0.12mm thinner than the design.
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Looking into the gcode I see:

Code: Select all

; single wall width = 0.39mm

which is pretty close to what I measured. What is the wall thickness that you measure?

I measured a thickness between 0.4 and 0.45 mm.

I suppose Slic3r can't print 0.5 mm because the nozzle is 0.35 mm and the layer height is 0.25 mm, indeed it prints only one line each layer.
If the thickness of the ooze-j-test would be 0.8 mm or greater than Slic3r would probably print at least two lines.

Otherwise setting the layer height to 0.2 mm results in a wall width of 0.49 mm.

Edit:

I've attached the Gcode-File with layer height=0.2mm > thickness = 0.5mm

Frob was right:
It was an epoxy encapsulated thermistor not a glass one and wasn't good for the hot end. This is the third thermistor that's gone bad. I bought it as an EPCOS B57561G0104F000.

This is a glass one and hopefully it will last longer:
The scale is the same in both photos. The glass encapsulated thermistor is 0.8mm in diameter.

Unfortunately, changing the thermistor was fatal for the heater:
Time for the real CuHotE:

Is that a wire heater? why not use a resistor or a cartridge?

Well, I have these reasons for using a nichrome heater:

1. It can be built in any shape, i.e. is not limited by the size of the resistor
2. It can have a very short melt zone, for faster prints
3. It can be very symmetrical and distribute heat evenly to the melt chamber, whereas a resistor/cartridge only heats from one side
4. It can be of any power desired, provided there is an appropriate nichrome wire size.

The destroyed heater had a length of 6mm, and so will the new one.