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Frustrated by mankind and overcaffeinated
No hope ultras
There is less material than needed all over the place, look at the not bonded perimeter lines on the top corner.
Measured the real filament diameter before printing and corrected the slicer settings to the measured diameter?
Are the extruder steps calibrated?
If iam to lazy to reslice, i would increase feedrate to around 106% and look at the following layers if the gaps are closed mid print.
This can be seen at layer 2 and corrected while printing
There is no seal like an o-ring.
It is bare metal to metal surface contact.
If there is a gap between nozzle backside end and heatbreak because the outer hexagonal part of the nozzle hit the heater block first (before the nozzle get tight at the heatbreak), it will leak through the treads and ooze out on the top.
If you can rotate the heaterblock after heating up the nozzle, then there is proof of the inside gap.
On a new hotend i disassemble it before mount it into the printer, screw in the nozzle in first and then turn it back half a turn.
Then screw the heatbreak in until it reaches the nozzle. Install it to the printer, heat to max used temperature, and tighten the nozzle again.
The heater block has bigger thermal expansion, so it tends to get loose by heating up.
If done correct you will never have problems like this, if the mating surfaces are even and not damaged.
Its not about torque only.
If build up correct, the nozzle flange does not touch the aluminium heater block. There must be a gap, can be a tiny gap.
You dont want to screw the nozzle against the block, but you want to screw the nozzle backside face (around the filament bore) against the heatbreak end face. This is the place where you close the oozing hole, the threads are not tight against liquid plastic.
@ExtremeDullard
Sometimes the filament diameter is not exactly 1.75mm, always a good idea to check before print.
I have made a excel sheet to convert the diameter to area mm² and then calculate the feedrate percentage correction value, but most times i look at it and set it manually when reprinting gcodes.
The key area is the overlap zone between infill lines and perimeter lines, seen when the bottom layers with full infill are printed. There should be a tiny roughness from overpressed material in this zone where the infill lines return direction. This is best spot to see if the right amount of material is extruded.