Filament Nudger for 3Doodler

Posted by MacGyvrBot on Fri 09 May 2014

For various reasons, the 3Doodler sometimes stops extruding. This can happen with any 3D Printer. However, the 3Doodler is exceptionally easy to get going again by giving the filament a gentle nudge. The Filament Nudger is a hack to reduce the number of times the 3Doodler stalls or jams by providing a continuously nudging force on the filament.

[caption id="attachment_1658" align="aligncenter" width="518"]Nudger without handle 3Doodler with Filament Nudger[/caption]

The Nudger works with or without the Phaser Handle described in a previous blog : How to 3D-print a Handle and Trigger for the 3Doodler (and to make it look like a Phaser)   If you have access to a 3D printer, you can build a Nudger yourself by downloading these files on Thingiverse.

[caption id="attachment_1659" align="aligncenter" width="518"]With handle 3Doodler with Phaser Handle and Filament Nudger[/caption]

The automatic Filament Nudger was designed to be powered by a pair of rubber bands,  and it is cocked by pulling back on the Filament Grabber mechanism.

[caption id="attachment_1654" align="aligncenter" width="518"]Cocking the Nudger Cocking the Filament Nudger[/caption]

The Grabber works like a 1-way clutch, pulling the filament toward the 3Doodler but releasing the filament when pulled in the other direction or when the Grabber bumps the back of the 3Doodler. The force applied by the rubber bands is effective in keeping the extruder going, but is not strong enough to prevent the filament retraction which conveniently keeps the 3Doodler from oozing between extrusions like a glue gun does.

[caption id="attachment_1656" align="aligncenter" width="518"]Filament Nudger works with filament provided by 3Doodler Filament Nudger works with filament provided by 3Doodler[/caption]

When used with the filament sticks provided by 3Doodler, the Filament Nudger has the benefits of (1) reducing extruder stalls and also (2) it lets you install a new stick any time after the trailing end of a stick disappears into the 3Doodler. Without the Nudger, a new stick may fall out when the 3Doodler is tipped upward before the new stick is engaged, and this can be annoying.

[caption id="attachment_1655" align="aligncenter" width="518"]Filament Nudger also works with longer 3mm filament Filament Nudger also works with longer 3mm filament[/caption]

With the Filament Nudger as a pre-feeder, Skip has been successfully using the same coiled filament that is used by MacGyvrBot (and other 3D printers). Warning: the use of such materials is not recommended by 3Doodler, and using any unauthorized materials will void the 3Doodler warranty!


Hinge pin


Create a hinge pin for the Grabber with small piece of filament, and put button heads on the pin with the 3Doodler.

2 Zip-tie Frame


Attach the Frame to the 3Doodler with a zip-tie.

3 Insert Skewers


Cut (2) 1/8 inch bamboo skewers to 7 inch lengths and insert them into the Frame (drilling out the holes if they are too tight, locking them in with small nails if they are too loose).

4 Insert Grabber


Insert the Grabber onto the filament and skewers as shown.

5 Insert Filament Guide


Insert Filament Guide over skewers and filament as shown (drilling out the holes if they are too tight, locking them in with small nails if they are too loose).

6 Hook rubber bands


Hook rubber bands over Grabber and attach them to Frame as shown.

 In our next post we will show how to use the 3Doodler to hack up accessories for itself!

Stay tuned!