Wood-D Extruder Drive

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Wood-D Extruder Drive

Release status: working

Description	Just another wooden bowden extruder for 3D-Delta-Printer (Open Source Project)
License	GPL v3
Author	User:JKDesign
Contributors
Based-on	[[]]
Categories	RepStrap LaserCut Wood Extruders Bowden Extruders Cold End
CAD Models	CorelDraw / PDF
External Link	http://wood-d.de

Description

Wood-D - Just another wooden 3D-Delta-Printer (Open Source Project)

Wood-D Extruder Drive is a simple bowden extruder based on LASER-cutted plywood or MDF or acrylic for 1.75 mm filament.

Design Objectives

Specifications

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 60 x 32(+Gears) mm

Features

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

Parts

Case

LASER cut 4 mm plywood or MDF or acrylic

Drive

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.

Gears

Standard industrial gears 72+24 module 0.8 OR RepRap printed gears from Wade's Geared Extruder

Note: The 72 tooth industrial gear has to be widened to 8 mm or M8

Note: The different gears needs different settings in firmware (industrial: 72/24; RepRap: 39/11)

Motor

NEMA 17 stepper motor as usual in RepRap projects

Bill of Materials

Quantity	Description	Type	Comments	Diagram
1	4 mm plywood or MDF or acrylic with min. 102 x 295 mm	LASER
1	Hobbed bolt M8 x 60 (as in Wade's Geared Extruder)	Shop
?	Washer M8	Fastener	distribute to center the hobbed position
1	Plastic gear 72 tooth module 0.8 (has to be widened to 8 mm or M8)	Shop
(1)	Alternative: RepRap big gear 39 tooth from Wade's Geared Extruder	RP
1	Plastic gear 24 tooth module 0.8	Shop
(1)	Alternative: RepRap small gear 11 tooth from Wade's Geared Extruder	RP
2	Ball bearing with flange F608ZZ	Shop
1	Ball bearing 605ZZ	Shop
1	Steel shaft 5 mm with length 34 mm	Shop	recommended: shaft with ground surface
1	Steel shaft 5 mm with length 17 mm	Shop	recommended: shaft with ground surface
2	Pneumatic bulkhead connector/fitting for 4 mm tube	Shop
1	PTFE (Teflon™) 4/2 mm tube with length about 2x 30 mm	Shop	use same as for connecting the hot end
2	Threaded rod M4 with length about 100 mm	Fastener	length depends on spring and nuts
4	Nut M4	Fastener
4	Screw M3 x 8	Fastener
4	Washer M3	Fastener
2	Wing nut M4	Fastener
(2)	Alternative: knurled nut M4	Fastener
(2)	Alternative: nut M4 glued in wooden star knob	LASER	wooden parts for star knob are in new LASER cut files
2	Spring 7 x 5.4 X 35 (or similar)	Fastener	nearly any spring with an inner diameter greater than 4 mm
1	NEMA 17 stepper motor	Shop
	Casein glue	Misc	for wooden parts
	2 Component glue (Epoxy)	Misc	for nuts on the threaded rods and the gear on the stepper motor

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

Downloads

Design and LASER cut files at GitHub repository github.com/jkDesignDE/Wood-D

Tutorial

Assembling tutorial as image sequence at wood-d.de/tutorials/tutorial-wood-d-extruder-drive

Links

More infos about the Wood-D project on the blog page wood-d.de (German language)