Non Linear Extrusion
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After scratching my head, re-learning basic algebra from 20 yrs ago, and measuring filament extrusion for about 2 months. these are my results.
https://docs.google.com/spreadsheets/d/1ubZfN2QO4fPvGmbomhlCTSN2EU2VlsGcNWAyUmTXQKI/edit?usp=sharing
I might be doing something wrong but it looks to me that an exponential curve is a better fit for my extruder. Help me out here guys. Am I doing something wrong?
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I think you need more points on the curve to establish what shape it is with any certainty. Have you tried a cubic fit with a zero second order term? i.e. ax + bx^3. That would be more economical to compute.
Duet WiFi hardware designer and firmware engineer
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http://www.escher3d.com, https://miscsolutions.wordpress.com -
I will measure .5mm/s to 5mm/s in .25 increments. Do you think that would be granular enough? Maybe .10 increments? Also should I disable pressure advance for these measurements? I wouldn't think it matters for extrusion lengths so long, but honestly I'm no expert on the matter.
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@dc42 Ok, I've added more data points. For what ever reason the extrusion is off from what I measured yesterday, but I think the data is still useful in tracking extruder behavior. I've made this copy editable, feel free to poke around.
https://docs.google.com/spreadsheets/d/1B8q2zofrjsFnoC0FLtv-hpMpZkyvaO-42U-vOC9Sgak/edit?usp=sharing
