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05_Extruder maximum flow.txt
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05_Extruder maximum flow.txt
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### Determine extruder maximum flow rate(mm^3/s)(maximum printing speed)
- Maximum Feed rate/Melting rate (extruder)(issue commands from mainsailOS web interface)
- > M83 #Set e to relative
- > M109 S210 #Set and wait for nozzle temp [210C]
- Increase the extrusion speed until the extruder starts to lose steps then take last value
- > G1 E50 F60 #Start at 1mm/s extrude 50mm (F60 = 60mm/min = 1mm/s)
- > G1 E50 F120 #2mm/s
- > G1 E50 F180 #3mm/s
- > G1 E50 F240 #4mm/s
- > G1 E50 F300 #5mm/s
- > G1 E50 F360 #6mm/s
- > G1 E50 F420 #7mm/s
- > G1 E50 F480 #8mm/s
- > G1 E50 F540 #9mm/s
- > G1 E50 F600 #10mm/s losing steps
- Convert mm/min to mm/sec
- 540 / 60 = 9
- Max feed rate = 9mm/sec
- Determine filament cross section
- Diameter: 1.75mm
- Radius = 1.75 / 2 = 0.875mm
- Cross section = pi * 0.875^2 = 2.405mm^2
- Approximate maximum flow rate (theoretical limit)
- maximum_flow_rate(mm^3/sec) = <max_extrusion_speed(mm/sec)> * <filament_cross_section(mm^2)>
- 9 * 2.405 = 21.645mm^3/sec
- Approximate max speed (theoretical limit)
- Recommnded line width: 1.2 * nozzle (0.48)
- speed(mm/sec) = <volumetric_flow(mm^3/sec)> / <layer_height(mm)> / <line_width(mm)>
- 21.645 / 0.2 / 0.48 = 225.469mm/sec
- Approximate volumetric flow (theoretical limit)
- volumetric_flow(mm^3/sec) = <speed(mm/sec)> * <layer_height(mm)> * <line_width(mm)>
- 225.469 * 0.2 * 0.48 = 21.645mm^3
### Print and measure for maximum flow
- print model 20230124_external_speed_test_2_0.2mm_PLA_MINI_23m.gcode
- gcode details (nozzle: 0.4, line_width: 0.48, layer_height: 0.2, perimeters: 1, Temp_bed: 60, Temp_nozzle: 215)
- 0-0.5, external perimeters: 60mm/s
- 0.5-5, external perimeters: 80mm/s
- 5-10, external perimeters: 100mm/s
- 10-15, external perimeters: 120mm/s
- 15-20, external perimeters: 140mm/s
- 20-25, external perimeters: 160mm/s
- 25-30, external perimeters: 180mm/s
- 30-35, external perimeters: 200mm/s
- 35-40, external perimeters: 220mm/s
- 40-45, external perimeters: 240mm/s
- 45-50, external perimeters: 250mm/s
- Measure from base up to where under extrusion begins
- 25mm = 160mm/s
- Calculate maximum volumetric flow rate from measurement
- 160 * 0.2 * 0.48 = 15.36mm^3/sec
- Confirm Calculation (speed)
- 15.36 / 0.2 / 0.48 = 160mm/sec
- Max filament feed rate
- 15.36 / 2.405 = 6.387mm/sec
### For more accurate flow rate calculation CNC Kitchen
- (https://www.cnckitchen.com/blog/extrusion-system-benchmark-tool-for-fast-prints)
- (https://www.printables.com/model/160335-hotened-benchmark-test-g-codes)
- will require a milligram scale