Best posts made by fho

This is basically a feature request to have a "Print Another" button on the PanelDue.

In the web interface you get the choice to "Print Another" after a finished or failed print, which accelerates the process if e.g. the first layer failed and you just want to ... "print another". Printing from the SD card menu is not really equivalent as it does not support sorting by modification date and you have to search through (potentially) many files.

I understand that this is purely a nice-to-have feature, but this came up on reddit and I wanted to bring it to your attention.

Well ... that was a false alarm ...

I checked the height of the sensor and checked the height of the nozzle in the toolhead ... nozzle was below sensor ... so I thought that was fine.

Turns out the round heat-sink has rattled itself lose over time and the heat-brake should have sat much higher in the cooler.

Sorry for the fuzz

One completely tangential side note that came out of the cross-area modeling above is that Curas simple rectangle (layer_height * extrusion_width) model is perfectly viable for lines that have "neighbors" on both sides. The combined extrusion will perfectly fill the space between the lines.

Where this falls short is at the outer lines, where the rounded corners will overshoot the intended line width. With a target width of 0.4 mm this model predicts an actual extrusion of 0.443 mm which corresponds to a necessary flow rate reduction of ~90% ... which is more or less exactly what I have measured every time I do flow rate calibrations.

The formula I use for this is:

target_volume = target_layer_height * target_extrusion_width
equivalent_circle_to_circle_width = (target_volume - ((0.5 * target_layer_height)^2 * pi)) / target_layer_height
actual_extrusion_width = equivalent_circle_to_circle_width + target_layer_height

In the end that means that 0.2 mm layer height prints from Cura will always be larger by 0.043 / 2 = 0.0215 mm in the XY plane.