[A different multi-extrusion approach - UM tool / printhead changer]

Been busy with exams and university in general ...

Need to get the AC wiring done, then I can test if it works well.

Yes I did all the machining on a 3-axis CNC. All CNC programs written by hand, no CAM involved ... wouldn't do that again

The feeder is much better to be printed than machined. If I had a CNC at hand I would much rather do a redesign to integrate the Hotend into the extruder body and maybe watercool that.

Also I'm doing a more or less regular write up of the build in the Reprap forum, if youre interested:

http://forums.reprap.org/read.php?336,757011

[A different multi-extrusion approach - UM tool / printhead changer]

@foehnsturm did you scrap your CoreXY?

I'm currently building mine:

Oh and I've made this:

[A different multi-extrusion approach - UM tool / printhead changer]

So now onto parts. You'll need :

1x 13t gear modul 1

1x 60t gear (modul 1, 4mm wide) -> I machined one side down so its only 3.6 wide but has a small hub part thats 4mm wide, Ø4 bore

1x Extruder drive gear (MK8 wheel) Ø9 OD, ca. Ø7-7,5 on the theeth diameter, 8mm wide, Ø4 bore (I've just hobbed the wheel with a M6 tap like

) -> if you switch to a different bore size (e.g. Ø5-6) you can buy MK8 wheels here

1x Ø4x18 axle (or whatever bore you did choose) -> cylindrical pin

2x flanged bearing 4x8x3 MF84 2RS -> here

1x 3x10x4 bearing 2RS version -> here

1x M3x7,5 threaded pin

1x ca.51,2-51,5 length Ø4 PTFE

1x Ø8x16 spring medium/high strength

[A different multi-extrusion approach - UM tool / printhead changer]

Thats what I used ...

It's rated at ≥25 N/mm² after 24h. So I suppose I'm good

[A different multi-extrusion approach - UM tool / printhead changer]

There's a 60T gear from misumi (or I think it was 58T) that has a inner dia of 12mm. With that you could insert the mk7 inside and align the screws so both are together in love

I didn't went that path because I just found out after buying my 50T

 

Would still be to big ...

You have to remove the hub part of the gear completely

Both gears are glued onto the axle so I'm not 100% sure if they hold up well ... but I'm working on a mechanical connection between the two gears much like a claw clutch.

But my glue is capable of much higher torque, I'm just not sure about surface area :/

[A different multi-extrusion approach - UM tool / printhead changer]

Here are the STLs for main body parts

Mechanical Parts will follow tomorrow

[A different multi-extrusion approach - UM tool / printhead changer]

BTW you need to manufacture/machine some parts yourself to make this design work !!!

e.g. the hub of the 60t Gear has to be shortened

[A different multi-extrusion approach - UM tool / printhead changer]

Haven't had the time to test it yet.

But everything goes together nicely, so would be nice if someone could confirm if it works alright.

Will upload some STL's and instructions in a minute.

[A different multi-extrusion approach - UM tool / printhead changer]

I've been working for a while on a derivative of the slim Extruder ...

Really great design foehnsturm

It's for a big CoreXY I build at work. And maybe a second one for me

Let me know what you think of my design