this post was submitted on 22 Jun 2023
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It's not just the nozzle size alone. Each hotend has a limit to the volumetric output, how much plastic it can melt in the time it takes the filament to travel through the hotzone in a certain time, which is roughly calculated by line_width x layer_height x print_speed, e.g 0.6 x 0.3 x 50 = 9. That the limit is varies depending on your print temperature and it also isn't linear - you start underextruding up to 50% before you hit the point where the extruders starts skipping for example - but there is a limit - for standard hotends it's usually around 15mm^(3)/s.
https://www.cnckitchen.com/blog/flow-rate-benchmarking-of-a-hotend