Materials[edit | edit source]
- 1 Print effector with magnets affixed
- 1 Print quick connect thumbscrew
- 1 Assembled Hexagon hot end
- 2 Assembled 40mm fan
- 2 M3 x 12mm socket head cap screw
- 1 Reamed pneumatic quick connect fitting
- About 63cm of 2mm id x 4mm od PTFE tubing
- 1 Small wire tie
Tools[edit | edit source]
- 2.5mm hex key
- Precision knife
Notes[edit | edit source]
- The end effector is the part that moves the extruder hot end around the build volume. The printed end effector is PLA, which if not cooled will soften under the heat produced by the hot end. A 40mm box fan cools the end effector, the heat sink on the hot end and also the part being printed. The fan must run when the hot end is heated!
- The hot end must fit tightly in the end effector and getting it to seat can be difficult. Once seated, the hot end is kept from moving by the PTFE tubing which is pushed through the quick connect fitting and into the hot end.
- The extruder is a Bowden cable design in which the filament is constrained in a low friction PTFE (teflon) tube. Filament is pushed on one side by the extruder drive and only permitted to exit out the orifice in the hot end. The Bowden sheath (the teflon tube) has a 2mm inside diameter that permits the 1.75mm filament to slide through easily. Teflon doesn't melt; chips left inside the tube will block the hot end nozzle and ruin your day.
Procedure[edit | edit source]
- Secure the fan, thermistor and heating resistor wires to the Bowden sheath with a small wire tie immediately above the Bowden sheath opening.