Compact Bowden Extruder Plus by mrm64

Last crawled date: 3 years, 1 month ago

This extruder is the 4th generation counted from the original Compact Bowden Extruder.
Updates
2018-04-23: Added type C body and related files
2018-04-23: Updated CG image
2018-06-09: Updated assembly picture
2018-07-04: Added idler V2 files
2018-07-04: Added a printed type C body picture
Basic Data
Extruder type: bowden
Drive method: direct drive
Stepper motor: NEMA 17
Filament diameter: 1.75mm
Drive gear: MK8 drive gear
Push-fit connecter: PC4-M6
Extruder Body Types

Type A
This type can be mounted on a box type printer.
The distance between the two holes of the mount part is 49mm.
If the holes position of the mount part does not match the holes position on the printer side, you can use Blender to edit the STL file and move the holes position.


Type B
This type can be mounted on a printer with T-slot.

Type C
This type can be mounted using a metal bracket or gimbal.
If you replace the motor spacer with a metal bracket, you will need to change the screws(M3x8mm -> M3x10mm, M3x10mm -> M3x12mm) that mounts the stepper motor and extruder, furthermore four sets of screws/nuts/washers for mounting on the printer are also required.
Requirements
Body/Idler
1 x NEMA 17 Stepper motor
1 x Heatsink for Nema 17 stepper motor (optional)
If you printed the body with PLA filament, it would be better to attach a heatsink

1 x MK8 drive gear
Outer diameter: 9mm
Length: 11mm
Hob diameter: 7mm
Bore: 5mm

1‒2 x PC4-M6 push-fit connecter
1 x Threadlocker
Lock the thread on the push-fit connecter

1 x Soft pick
Used to clean the drive gear automatically

1 x 625ZZ bearing (or 625-2RS bearing)
1 x 608ZZ bearing (or 608-2RS bearing)
1 x Small sponge piece (idea from Marco67)
Put into the motor side rectangle hole on the extruder body (to fix the M3 nut position)

2 x M3x8mm pan head screws
When mounting Type C body with metal bracket, change to M3x10mm

2 x M3x10mm pan head screws
When mounting Type C body with metal bracket, change to M3x12mm

2 x M3x15mm pan head screws
2 x M3x40mm screws
Using the flat head screws makes it easier to insert and remove the spring compressor and makes it easier to evenly tighten the left and right screws
When using full thread screw, stick an adhesive tape on a place to touch the idler and the washer board, the idler movement is becomes smooth

2 x Compression springs
Wire diameter: 0.6‒0.8mm
Outer diameter: 5‒8mm
Free length: 12‒15mm

4 x M3 hex nuts

Mount (Type A)
2 x M3 screws
2 x M3 hex nuts
2 x M3 washers

Mount (Type B)
2 x M3 screws
2 x M3 t-slot nuts (or hex nuts)

Mount (Type C with metal bracket)
4 x M3 screws
4 x M3 hex nuts
4 x M3 washers

Print Settings
Body
Nozzle diameter: 0.4mm
Resolution: 0.2mm
Perimeter count: 4
Infill: 30% or higher

Idler
Resolution: 0.2mm
Perimeter count: 4
Infill: 90%

Bearing spacer
Resolution: 0.2mm

Motor spacer
Resolution: 0.2mm

Spring compressor
Resolution: 0.2mm

Washer board
Resolution: 0.2mm

Spring Compressor
The spring compressor has a function to quick release/restore the spring pressure.
Please attach it to the screw head when using the 3D printer, and remove it from the screw head when finished using the 3D printer.
The burden on idlers when 3D printers are not used decreases, and the idlers becomes hard to break.
CBE_IdlerSet*V2.stl
Changes from previous version
Made left and right idlers the same thickness
Reduced cylinder size

Related Thing
1.5 Axis Gimbal for NEMA 17