3D Printing & Modeling + Ed3DP

1. Educator 3DP Manual

1.7. Extruder Setup

Educator 3DP- Extruder/Filament Setup

The filament is driven through the hotend nozzle by a filament drive cog and filament idler which is tensioned with a pivoting arm and compression spring and bolt.  It is important that the compression force of the filament idler on the filament and drive cog is correct such that there is no grinding and sheering of filament nor slipping and failure of the filament to move.  The nozzle also needs to be free of obstructions.

1.       Clean the nozzle and drive cog:

a.       Turn on the printer- home all

b.       Goto “Preheat” menu and adjust the extruder temperature up to 190 from its default of 180 degrees Celsius

c.       Once the extruder is at 190 degrees remove the existing filament

     i.      Release the tension on the filament by turning the tension bolt anticlockwise

     ii.      Depress the filament idler arm without putting downward force on the whole extruder assembly itself- keep your fingers away from the hot nozzle underneath

    iii.      Withdraw the filament by pulling up while depressing the filament idler arm

   iv.      Clean the filament drive cog with the small wire brush by starting at the back and brushing forward thus brushing the ground filament forward and out not backwards and into the assembly- rotate the drive cog and repeat till the drive cog is completely clean

d.       Load the “cleaner filament” into the extruder and tighten the idler tensioner bolt clockwise till “firm by finger”

e.       Extrude about 50 to 100mm of “cleaner filament” till extrusion is completely clean with no residual  filament by going to the “Extrude” menu and pressing “Extrude Filament”

f.        Remove the “cleaner filament” as in step c

2.       Load new filament:

a.       Make sure that the extruder is preheated and clean as above

b.       Straighten the filament end by running your compressed fingers along filament

c.       Make sure filament is clean and undamaged and not “brittle”

d.       Cut filament at 45 degrees to the vertical- cleanly with side cutters so that it forms a “spear”

e.       Load the new filament while releasing the idler compression- unscrew the tensioning bolt and depress idler arm

3.       Nozzle clear test:

a.        While releasing the idler compression on the filament and drive cog- you should be able to slowly push the filament down through the nozzle and have it extrude

b.       If you can’t do this the nozzle may be partially blocked- see the above steps for cleaning

c.       If the nozzle is completely blocked it will need to be removed and replaced while hot

4.       Tension filament idler:

a.       Screw the filament tensioning bolt clockwise till “finger tight”

b.       Goto “Extrude” menu and extrude 10mm of filament- at the same time pinch the filament between your fingers tightly- the filament should drag through your pinched fingers directly above the extruder

c.       Tension is too low if you can stop the filament with your pinched fingers or if it slips on the drive cog while printing but does not slip while doing a test extrude

d.       Tension is too high if the drive cog gouges and grinds the filament