SD Card with filament eject/load and printer preheat gcode for Crazy3Dprint CZ-300 and others

Copy these files to a spare SD card, and use to make life easier when changing filament or just preparing the printer for a print.

Eject filament will heat the nozzle, and run the extruder motor backwards until filament is out. 

Load filament will pull the filament from the extruder towards the nozzle slowly while heating, center and rise the nozzle and wait until hot and then prime the nozzle.

Preheat printer will turn on bed and nozzle and home the axes, so that everything is ready for printing.

Or use the code to adjust your printer setup, what about a Cura setting that eject the filament after each print just in case? Cura printer manage menu has fields to add code to any print.

Check the pdf file for more tips.

For Crazy3Dprint CZ-300, but useful for other printers with minor adjustments.

Eject filament gcode

M104 S220 ; set nozzle temp
M105 ; report temp
; give nozzle time to heat to above room temp by heating bed slightly
; sometimes in cold rooms the temp sensor glitches
M140 S30 ; set bed temp
M105 ; report temp
M190 S30 ; wait for bed temp
M109 S220 ; wait for nozzle temp
M82 ; absolute extrusion mode
G92 E0 ; reset extruder position
G1 F200 E3 ; extrude 3mm at 200mm/min feedrate (prime nozzle)
G92 E0 ; reset extruder position
G1 F3000 E-950 ; retract filament fully back and out of extruder
G28 ; home all axes
G1 Z15 F5000 ; lift nozzle 15mm at 5000 mm/min
G1 F4000 X0 Y300.0 ; present bed for cleaning
M84 ; disable motors

Load filament gcode:

M104 S210 ; set nozzle temp
M105 ; report temp
M82 ; absolute extrusion mode
G28 ; home all axes
G1 Z15 F5000 ; lift nozzle 15mm at 5000 mm/min
G0 F5000 X150 Y0 Z50 ; move to nozzle center and bed back
G92 E0 ; reset extruder position
G1 F1000 E830 ; load filament close to extruder
M109 S210 ; wait for nozzle temp
G92 E0 ; reset extruder position
G1 F100 E50 ; extrude 50mm at 200mm/min feedrate (prime nozzle)
M84 ; disable motors

Preheat printer gcode:

M104 S210 ; set nozzle temp
M105 ; report temp
M140 S70 ; set bed temp
M105 ; report temp
G28 ; home all axes
G1 Z15 F5000 ; lift nozzle 15mm at 5000 mm/min
M84 ; disable motors