[idbox] Secondary Extruder by mrm64

Last crawled date: 3 years ago

This is a direct drive bowden extruder remodeled for deagostini idbox.
It is assumed to be used as a secondary extruder, but it can also be used as a primary extruder.
Remixed from: Compact Bowden extruder by scarou
Merged from: [idbox] Filament Funnel Set, Pacman Helper Disk V2 by midniteandy
Updates
2017-01-29 Added Spring_Compressor.stl
2017-03-02 Added SecondaryExtruder_Body_Disks_SupportV2.stl
2017-12-21 Added Spring_Compressor_V2.stl and Washer_Board.stl
2017-12-28 Added Spring_Compressor_V2.1.stl
Requirements
Use for extruder
1 x NEMA17 stepper motor
1 x MK8 drive gear
Outer diameter: 9mm
Length: 11mm
Hob diameter: 7mm
Bore: 5mm

1 x PC4-M6 connector
1 x PTFE tube
Outer diameter: 4mm
Inner diameter: 2mm

1 x 625ZZ bearing (or 625-2RS bearing)
1 x 608ZZ bearing (or 608-2RS bearing)
2 x M3x8mm pan head screws
2 x M3x10mm pan head screws
2 x M3x15mm pan head screws
2 x M3x40mm any screws
If you use a spring compressor, you may choose a flat head screws.
Truss head screws are not suitable for spring compressor.
2 x Compression springs
Wire diameter: 0.5‒1mm (0.0197‒0.0394")
Outer diameter: 5‒7mm (0.1969‒0.2756")
Free length: 10‒15mm (0.3937‒0.5905")

4 x M3 nuts
12 x M3 washers

Use for mount
2 x M3x14mm truss head screws
2 x M3 nuts
2 x M3 washers

Other requirements
1 x Dual print head
1 x Hotend kit

Print Settings
Body settings
Resolution: 0.2mm
Perimeter count: 4
Infill: 30%
Rafts: Yes
Supports: Yes
Supports everywhere: No

Idler settings
Resolution: 0.2mm
Perimeter count: 4
Infill: 60% (or higher)
Supports: Yes

Spring compressor settings
Resolution: 0.2mm
Supports: No

Marlin Firmware Settings

Configuration.h
Invert the direction of motor rotation#define INVERT_E1_DIR true
E steps per mm
Hob effective diameter: 7mm#define DEFAULT_AXIS_STEPS_PER_UNIT {71.1111,71.1111,3200,145.5131}
Hob effective diameter: 6.9mm#define DEFAULT_AXIS_STEPS_PER_UNIT {71.1111,71.1111,3200,147.6212}
Hob effective diameter: 6.8mm#define DEFAULT_AXIS_STEPS_PER_UNIT {71.1111,71.1111,3200,149.7929}
Hob effective diameter: 6.7mm#define DEFAULT_AXIS_STEPS_PER_UNIT {71.1111,71.1111,3200,152.0286}


Reference
Triffid Hunter's Calibration Guide - RepRapWiki

e_steps_per_mm = (motor_steps_per_rev * driver_microstep) * (big_gear_teeth / small_gear_teeth) / (hob_effective_diameter * pi)


Spring Compressor
Insert the spring compressor between the screw head and the washer, you can increase the pressure on the spring.
When 3D printing is finished, pulling out the spring compressor from the screw head can reduce the burden on the idler and the spring.
Washer Board
The washer board makes it easy to insert the spring compressor.
Attach to the screw head protruding from the idler.