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==See also== | ==See also== | ||
* [[Weed wacker line as 3D printing filament]] | * [[Weed wacker line as 3D printing filament]] | ||
* [[MOST Delta end effector for polypropylene]] | |||
[[category:MOST methods]] | [[category:MOST methods]] |
Revision as of 18:25, 19 November 2015
BOM
- 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
OpenSCAD design
- 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.
Build Instructions
Testing with Athena RepRap 3D printer
10/22/15 - Test 0
Conditions
- 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
Notes
- 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.
10/23/15 - Test 1
Conditions
- 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
Notes
- 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.
10/23/15 - Test 2 ABORTED plugged nozzle
Conditions
- 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
Notes
- 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.
10/27/15 - Test 3
Conditions
- 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)
- Model: raptor_reloaded_gauntlet_supported.stl
- Temperature: 265 C
- Print speed: 70mm/s
- Slicing: Cura 15.04, 2.667mm filament, 1 multiplier, 0.2mm layer height, print/infill.perimeter speed 70mm/s, bridge speed 30mm/s, 10% infill, 30mm/s initial layer speed
- Bed: Mirror with glue stick
Notes
- First print with 24V fan. Too much cooling, occluded fan with tape.
- Part of print warped off of the bed.
- Reduced print speed to 50% (35 mm/s max)
- Reduced acceleration to 1000 mm.s^2
- Reduced max speed to 100 mm/s
- Above done to counter end effector being dislodged during printing, which occurred on two previous attempts.
- Print was brittle and broke easily at sides.
10/27/15 - Test 4
Conditions
- 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)
- Model: raptor_reloaded_gauntlet_supported.stl
- Temperature: 265 C
- Print speed: 45mm/s
- Slicing: Cura 15.04, 2.667mm filament, 1 multiplier, 0.2mm layer height, print/infill.perimeter speed 70mm/s, bridge speed 30mm/s, 10% infill, 30mm/s initial layer speed, raft with 0 air gap, support: touching build plate
- Bed: Mirror with glue stick
Notes
- Printed with a raft having no air gap so print is fused to raft attempting to counter warping.
- The mirror was cracked at startup and developed two more cracks during this print. The long crack through the center was also displaced in shear (see photo, above).
- The raft tore off despite no air gap.
- Overhang support was more difficult to remove. It was fused well to the underside of the print. Needle nose pliers were required to pull it off.