Wood-D Extruder Drive



Based on the LASER cut constructive parts you get a very high precision at easy assembling.

The plywood parts/puzzle are hold together with key and slots and a little bit of glue. Through the box design with cross bracing the stiffness is very high.

All non-plywood parts are standard industrial parts you can be bought from online shops or eBay.

Easy assembling – only drive shafts and threaded rods have to be sawed.

Necessary tools: LASER cutter (visit a FabLab/Hackerspace in your area), hand saw for metal, screw drivers, gripper, cutter, soldering iron


Principle Bowden extruder like Wade’s Geared Extruder
Construction LASER cut 4mm plywood or MDF (1 piece 102 x 295 mm) (also acrylic can be used)
Drive Gear driven hobbed bolt with NEMA 17 stepper motor
Filament for 1.75 mm (Little redesign for 3 mm)
Dimension 100 x 70 x 32(+Gears) mm

Teile   Parts


LASER cut 4 mm plywood or MDF or acrylic


Hobbed bolt M8 x 60 (as in Wade’s Geared Extruder) OR a hobbed shaft with M8 on both ends.

Meantime you get industrial made shafts of hardened steel.


Use standard industrial gears OR RepRap printed gears from e.g. Wade’s Geared Extruder or Greg’s Hinged Extruder or other derived variations

Note: You also find sources for printed gears on thingiverse.com like the High Resolution Herringbone gears for Greg’s Wade Reloaded extruder

The effective gear distance can be adjusted between 37.5 and 42.5 mm by sliding the motor.

The different gear types needs different ratio settings in firmware (Example: Marlin firmware with 6.0 mm effective shaft diameter)

Type Module Gears Ratio Eff. Dist. Example source code Comments
Industrial 0.8 72 / 24 3 38.4 mm #define DEFAULT_AXIS_STEPS_PER_UNIT {80, 80, 80, (200*16)/(6.0*3.14)*(72/24)} The 72 tooth gear has to be widened from 6 mm to 8 mm or M8 (6.8 mm core)
Industrial 1 64 / 12 5.333 38 mm #define DEFAULT_AXIS_STEPS_PER_UNIT {80, 80, 80, (200*16)/(6.0*3.14)*(64.0/12.0)} The 12 tooth gear has to be widened from 4 mm to 5 mm for motor shaft
Industrial 1 64 / 18 3.555 41 mm #define DEFAULT_AXIS_STEPS_PER_UNIT {80, 80, 80, (200*16)/(6.0*3.14)*(64.0/18.0)} Fits as is
Wade’s Geared Extruder
 ? 39 / 11 3.545 41.9 mm #define DEFAULT_AXIS_STEPS_PER_UNIT {80, 80, 80, (200*16)/(6.0*3.14)*(39.0/11.0)} Fits as is
Has hex-bolt-fitting
Greg’s Hinged Extruder
or herringbone / fishbone variations
1.5 47 / 9 5.444 42 mm #define DEFAULT_AXIS_STEPS_PER_UNIT {80, 80, 80, (200*16)/(6.0*3.14)*(47.0/9.0)} Fits as is
Has hex-bolt-fitting

For the prototype and tutorial images an industrial type 72/24 was used.


NEMA 17 stepper motor as usual in RepRap projects

Stückliste   Bill of Materials

# Parts (english) Teile (deutsch)
1 4 mm plywood  or MDF or acrylic with min. 102 x 295 mm 4 mm Schichtholz oder MDF oder Acryl-Glas mit min. 102 x 295 mm
1 Hobbed bolt M8 x 60 (as in Wade Extruder) “Hobbed Bolt” M8 x 60 (wie im Wade Extruder)
? Washer M8 (to center the hobbed position) Beilagscheiben M8 (zum Zentrieren der Verzahnung)
1 Plastic Gear 72 Tooth Module 0.8 (has to be widened to 8 mm or M8) Kunststoff-Zahnrad 72 Zähne Modul 0.8 (muss auf 8 mm oder M8 aufgebohrt werden)
(1) Alternative: RepRap big Gear from Wade Extruder Alternative: Großes Zahnrad aus Wade Extruder
1 Plastic Gear 24 Tooth Module 0.8 Kunststoff-Zahnrad 24 Zähne Modul 0.8
(1) Alternative: RepRap small Gear from Wade Extruder Alternative: Kleines Zahnrad aus Wade Extruder
2 Ball Bearing with flange F608ZZ Kugellager mit Flansch F608ZZ
1 Ball bearing 605ZZ Kugellager 605ZZ
1 Steel Shaft 5 mm with Length 34 mm Stahlwelle 5 mm mit Länge 34 mm
1 Steel Shaft 5 mm with Length 17 mm Stahlwelle 5 mm mit Länge 17 mm
2 Pneumatic bulkhead connector/fitting for 4 mm tube Pneumatische Schttverschraubung für 4 mm Schlauch
1 PTFE (Teflon™) 4/2 mm tube Lenth about 2x 30 mm PTFE (Teflon™) Schlauch 4/2 mm Länge ca. 2x 30 mm
2 Threaded rod M4 Length about 100 mm Gewindestange M4 Länge ca. 100 mm
4 Nuts M4 Muttern M4
4 Screws M3 x 8 Schrauben M3 x 8
4 Washer M3 Beilagscheiben M3
2 Wing Nuts M4 Flügelmuttern M4
(2) Alternative: Knurled Nuts M4 Alternative: Rändelmutter M4
(2) Alternative: Nuts M4 glued in wooden star knob Alternative: Mutter M4 verklebt in Holz-Sterngriff
2 Spring 7 x ? X 35 (or similar) Spiralfeder 7 x ? X 35 (oder ähnlich)
1 NEMA 17 Stepper Motor NEMA 17 Schrittmotor
Casein Glue Weißleim
2 Component Glue (Epoxy) 2 Komponentenkleber (Epoxy)

Anleitungen   Tutorials

Bauanleitung als Bildersequenz in der Gallerie

Bilder   Pictures


CorelDraw-Datei (CDR): Wood-D-ED-1.0.CDR

LASER-Cut-Datei (PDF): Wood-D-ED-1.0.PDF (optimiert für LASER mit 0.1 mm Schnittbreite. Material: 4 mm Schichtholz oder MDF 102 x 295 mm)


Artikel auf der RepRap.org-Seite unter reprap.org/wiki/Wood-D_Extruder_Drive (englisch)


Creative Commons License
Wood-D by Jochen Krapf is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Content of this page is available under GNU Free Documentation License 1.2.