MOST Delta end effector for nylon

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

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, 70mm/s, 25% infill, 30mm/s initial layer speed
Bed: Glass mirror with glue stick

First layer too close to glass requiring decrease in speed.
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 speed up to 140% (98mm/s) while printing first ~100 layers
Lower layers exhibited poor interlayer bonding
Resulting print is flexible, but makes cracking noise when squeezed due to poor interlayer bonding