MOST Delta end effector for nylon: Difference between revisions

Revision as of 15:40, 23 October 2015

Lulzbot hexagon hotend $70 https://www.lulzbot.com/products/lulzbot-hexagon-hot-end
24V/4-5A power supply
3mm id x 6mm od PTFE tubing 630mm long
2x M6 x 0.8mm hex nut
3mm print effector
3mm extruder drive body
~1m 18ga speaker wire
2x ~1m 28ga twisted pair
Heat shrink tubing

End effector - download latest version of [Athena SCAD files] and [SCAD libraries]. Change the Bowden dimensions in athena.scad. Render the end effector and print.
Extruder drive - download latest version of [extruder drive SCAD files] (requires the SCAD library, as above). Change the filament dimensions in extruder_drive_renderer.scad. Render the extruder drive body and print.

Filament: Maxpower 333605 Residential Grade Round .105-Inch Trimmer Line 690-Foot Length from Amazon for $24.35/3 pounds (1.3kg $18.73/kg)
End effector: 3mm Athena print effector
Hot end: Lulzbot Hexagon, 3mm x 0.35mm
Extruder drive: 3mm Phidias extruder drive
Firmware: Franklin (latest)
Temperature: 260 C
Print speed: Variable (testing capabilities)
Slicing: Cura 15.04 set to 3mm filament, 1 multiplier, 0.2mm layer height, print speed 70mm/s, 25% infill, 30mm/s initial layer speed
Bed: Mirror with glue stick

Using a 12V fan on the end effector with pwm. Fan speed too high, end effector would not reach target temperature. Occluded lower half of fan with masking tape.
First layer too close to glass requiring decrease in speed.
Adjusted speed from 30% (21mm/s) to 140% (98mm/s) in 10% increments (70mm/s speed set in slicing) while printing first ~100 layers.
Lower layers exhibited poor interlayer bonding.
Print is flexible, but makes cracking noise when strained due to poor interlayer bonding.
Bridging performance improved when speed lowered to ~30mm/s
Experienced minor respiratory irritation during test. Future tests will be conducted under a hood.

Filament: Maxpower 333605 Residential Grade Round .105-Inch Trimmer Line 690-Foot Length from Amazon for $24.35/3 pounds (1.3kg $18.73/kg)
End effector: 3mm Athena print effector
Hot end: Lulzbot Hexagon, 3mm x 0.35mm
Extruder drive: 3mm Phidias extruder drive
Firmware: Franklin (latest)
Temperature: 260 C
Print speed: 70mm/s
Slicing: Cura 15.04 set to 3mm filament, 1 multiplier, 0.2mm layer height, print speed 70mm/s, 25% infill, 30mm/s initial layer speed
Bed: Mirror with glue stick

Using a 12V fan on the end effector with pwm. Fan speed too high, end effector would not reach target temperature. Occluded lower half of fan with masking tape.
Adjusted switch position (smaller) still some skipping on first layer
Bridging performance is abysmal. Cura doesn't help it.
Interlayer bonding improved.

Maxpower 333605 test 2 print result.

Filament: Maxpower 333605 Residential Grade Round .105-Inch Trimmer Line 690-Foot Length from Amazon for $24.35/3 pounds (1.3kg $18.73/kg)
End effector: 3mm Athena print effector
Hot end: Lulzbot Hexagon, 3mm x 0.35mm
Extruder drive: 3mm Phidias extruder drive
Firmware: Franklin (latest)
Temperature: 265 C
Print speed: 70mm/s
Slicing: Slic3r 1.2.9, 2.667mm filament, 1 multiplier, 0.2mm layer height, print/infill.perimeter speed 70mm/s, bridge speed 30mm/s, 25% infill, 30mm/s initial layer speed
Bed: Mirror with glue stick

Using a 12V fan on the end effector with pwm. Fan speed too high, end effector would not reach target temperature. Occluded lower half of fan with masking tape.

@@ Line 61: / Line 61: @@
 ===10/23/15 - Test 2===
-[[File:Athena_max333605_test1.JPG|thumb|left|Maxpower 333605 test 2 print result.]]
+[[File:Athena_max333605_test2.JPG|thumb|left|Maxpower 333605 test 2 print result.]]
 ====Conditions====
 *Filament: Maxpower 333605 Residential Grade Round .105-Inch Trimmer Line 690-Foot Length from [http://www.amazon.com/dp/B001BKZT1S/ref=pe_175190_21431760_M2T1_SC_dp_1 Amazon] for $24.35/3 pounds (1.3kg $18.73/kg)