Entropy Reduction

Personal log of yet another digital native.

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Project maintained by andre-abadi Hosted on GitHub Pages — Theme by mattgraham

Purpose

• Evaluate the real world performance of currently fitted copper plated 0.4mm nozzle on Dragon HF hotend
• Test new 0.4mm Bondtech CHT nozzle and quantify any improvement instead of continuing to guess at maximum volumetric flow rates

References

• Ellis’s Determining Maximum Volumetric Flow Rate

Method

• Klipper UI Extuder section used to determine volumetric flow rate for a given feedrate
• To test existing nozzle followed by new nozzle

Actions

Phaetus 0.4mm Nickel Plated Copper Nozzle

• Test 0.4mm copper plated nozzle that came with Dragon HF hotend
• In each case the following values were used
  • Pressure Advance of 0.035s
  • Smooth Time of 0.04s
  • Filamen Length of 100mm

Temperature (°C)	Feedrate (mm/s)	Flow Rate (mm³/s)	Actual Extrusion Distance (mm/%)
240	4	9.6	100
240	5	12	100
240	7	16.8	99
240	8	19.2	98
240	8.5	20.4	96
240	9	21.6	85*
250	8	19.2	98
250	8.5	20.4	99
250	9	21.6	96
250	9	21.6	96
260	9	21.6	98
260	9.5	22.9	98
260	9.75	23.5	94*

• • Denotes extruder clicking (skipping)
• Max volumetric flow at 240°C is 19mm³/s, less than the 21 I had believed to be the case given Ellis quoting 25mm³/s for a Dragon HF hotend as I have
• Max volumetric flow at 260°C is 22mm³/s, which gives more weight to temperature than I had expected

Bondtech CHT 0.4mm Nickel Plated Brass Nozzle

• OG CHT series nozzle (BTB subsequent hardened or copper cored in existence)
• In each case the following values were used
  • Pressure Advance of 0.035s
  • Smooth Time of 0.04s
  • Filamen Length of 100mm

Temperature (°C)	Feedrate (mm/s)	Flow Rate (mm³/s)	Actual Extrusion Distance (mm/%)
240	9.75	23.5	99
240	10	24.1	97
250	10	24.1	98
250	10.4	25	98
250	11	26.5	94
260	10.4	25	99
260	10.4	25	99
260	10.8	26	99
260	11	26.5	99
260	11.21	27	97
260	11.45	27.5	96*
260	11.65	28	94*
260	12.05	29	98**
260	12.46	30	98**

• • Denotes extruder gears clicking (skipping)
• ** Denotes highly irregular ‘wiggly’ extrusions, as well as extruder gears clicking (skipping)

Reflections

• CHT increases max volumetric flow noticably
  • At 240°C from 19mm³/s to 24mm³/s, which is a 26% improvement
  • At 250°C from 21mm³/s to 25mm³/s, which is a 19% improvement
  • At 260°C from 22mm³/s to 26.5mm³/s, which is a 20% improvement
• Overall the 0.4mm CHT nozzle is 20% faster than the nickel plated copper nozzle