This is the Ditan Extruder. It's an Dual Drive (D...) Titan (...itan) clone.
It's 3:1 geared, spring loaded and dual gear driven for maximum torque and grip.
This version is only for 1.75mm filament version.
This project was inspired by the Pitan and Drakon extruder.
Both are really great in design and function.
I liked the sleek design and missed only one thing to make the perfect extruder
... dual drive gears like the Bondtech gears.
I tried to keep it as compact as possible.
For assembling you will need the following parts:
a set of dual drive gears like this one
1x M5x45 hex bolt
2x M5 Nut or at least 1x M5 lock nut
2x M5 washers (5,3x10x1)
1x M4x16 hex socket (Allen) or philips bolt
1x M4 Nut
3x M3x40 hexagon socket (Allen) or philips bolt (at least two and one can be M3x30)
3x M3 Nut
3x M3x10 or M3x12 hexagon socket (Allen) bolt (depends on the thickness of the extruder mount and the motor)
1x Spring 7.5x20 (usually bed springs similar to Ultimaker springs)
2x 625ZZ ball bearings
1x PC4-01 pneumatic coupler with M10 thread.
and some PTFE tube.
The extruder is also designed to be used as a direct extruder... the bowden coupler can be also replaced with a standard v6 heat sink, which should fit directly into.
25% Grid (but it's your choice)
You need to print all parts at least once, except the spacers where you will need at least two of them. The hand wheel is optional and was originally planned as an indicator, but I found it usefull also for manually extruding e.g. loading and unloading filament.
Most parts don't need any support except the lever where support is mandatory all over and also for the body I would recommmend to have "support only from buildplatform".
All other parts should work fine without support, but you can decide for yourself and your machine settings.
I would recommend to print it in PETG or ABS. But even PLA can work.
Everything can be printed in 0.2mm layerheight. But I recommend to print the gears slowly and with 0.1mm Layerheight.
For assembling look at the exploded assembly picture.
The M5 bolt needs a flat 5mm long groove aproximately 17mm from the bolt head, for the grub screw of the gear to fit more tight on the bolt and doesn't move. It's just needed to be flat not that deep. 2 mm (depending on the grub screw of the gear) should be more than enough, I saw, that different seller seems to use different length of grub screws.Use a metal rasp or whatever better tool you have (Rotary tool, nail file ;).
Screw the pneumatic coupler in and push the PTFE as deep as possible through it into the filament guider. You can also put in a small 4mm PTFE tube at the top, but thats optional.
1) M4x16 hex socket (Allen) or philips bolt
2) M4 nut
3) Spring 7.5x20
4) M3x10 hex socket (Allen) or philips bolt
5) M3 Nut
6) Gears set
7) M5 washer (5,3x10x1)
9) Spacer (printed)
10) Big gear (printed)
11) Small gear (printed)
12) Stepper Motor
13) Motor mount (printed)
14) Extruder mount (printed) - optional another solution possible
15) Body (printed)
16) Lever (printed)
17) 3mm shaft (in set of gears) - can be possbly replaced with a M3 screw
18) Cover (printed)
19) M5 screws or possibly M5 lock nut
20) M3x40 bolts
21) Hand wheel (printed) - optional
22) Bowden coupler (printed) - optional
23) M5x45 hex bolt with flat spot