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)
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)
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
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)
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.