Dual E3D Bowden Hotend Upgrade for V3.0

[seaton]

G'day one and all,

Here are some screen shots of dual E3D Bowden hot ends for the V3.0 Felix printer that I'm working on and just about ready to test fully. I have tested parts and fits perfectly with the V3.0 carriage. Printing requires support.

Can run either one or two hot ends, so you can start of with single head then add the second at a later time.

I still need to add the fans, but was designed to be the same height as the original hot ends so I can use the fan cowlings that came with my printer, I still have some tweaking to do with the model, but is very close and will post results soon (time permitting)

[andrewsi]

Looks great. You know, one problem I have with the Felix design, which many other designs also seem to fall into the same trap of, is using these muffin-style fans into an enclosure or ducting that causes pressurization due to restriction of the airflow, like the Felix 3.0's "nozzle" cooling fan (not the hot end cooler which is wide open and works fine.) You get very little airflow out the nozzle end because of the design of these muffin fans, as soon as there's much pressure, it leaks out around the sides.

The advice I've seen is to replace the muffin with a "squirrel cage" style fan/blower which is designed to create much more pressurization at the exhaust end. Of course the geometry gets a bit funky because those designs exhaust at 90 degrees to the rotation of the fan, but I bet it'd be possible to design something with some ducting that'd still work. Seems like Delta Electronics even produces one at the 40x40x10 measurements of the originals, although of course the exhaust comes out the "side".

[Shayne]

Andrew this is an issue I had with my first E3D design (single direct feed), Major mods with a die grinder, then redesign and then reprint. Now the exhaust side is bigger than the fan side to relive back pressure there. only pressure build up is now through fins

[scp]

Hi Seaton,

I like your design and I'd like to learn about your progress. However, when comparing your airguide with the original E3D one that comes with the hotend, I wonder why you don't cover all the heatsink fins. It appears to me that the cooling of the lower part is essential to keep the amount of molten plastic low.

Cheers,
Paul

[seaton]

Yes agreed Paul,

I've been working on an updated design which has changed considerably to this one as I also wanted the distance between the heads as close as possible so as little distance is lost as possible on the x-axis, the mk2 has them as close together as I can get and now using a single 40mm for both hot ends which now covers the complete e3d cooling fins.

I'm just trying to nut out how it's going to be easy assembly/disassembly for maintenance as won't be separate design per hotend like this one here

[scp]

Thanks for the update, Stephen!

Cheers,
Paul

[doceme]

Hey Stephen,

I'm thinking about getting another E3D v5 hotend and was wondering if you had any updates on this?

[seaton]

no been put on hold sorry. I have had too may deadlines on my plate at work