Prometheus Hot End: New Customizable All Metal Hot End now on Indiegogo!

[RP Iron Man]

Hey Geoff,

By "no leaks" I meant that the plastic cannot leak from internal junctions because it is a 1-piece nozzle. As for the dribble ("ooze"), there are ways to significantly lessen this. I haven't tested with dual extruder, but it you are using 1.75mm filament and you customize Prometheus to have a short "melt-zone" the dribble (or "ooze") will be almost entirely eliminated. So that could work...

Eric

[Geoff]

Hey Geoff,

By "no leaks" I meant that the plastic cannot leak from internal junctions because it is a 1-piece nozzle. As for the dribble ("ooze"), there are ways to significantly lessen this. I haven't tested with dual extruder, but it you are using 1.75mm filament and you customize Prometheus to have a short "melt-zone" the dribble (or "ooze") will be almost entirely eliminated. So that could work...

Eric

Sorry to be a party pooper, but I have never had my $12 nozzles leak from internal junctions - ever. There is a brass nozzle attached to what appears to be a steel cylinder which heats up and pre-melts the filament before it's pushed into the hot end - there is nowhere for it to leak. I've been through close to 50kg of filament.

I am still having trouble understanding the short 'melt-zone'

can you explain that in a bit more detail please?

[RP Iron Man]

Sorry to be a party pooper, but I have never had my $12 nozzles leak from internal junctions - ever. There is a brass nozzle attached to what appears to be a steel cylinder which heats up and pre-melts the filament before it's pushed into the hot end - there is nowhere for it to leak. I've been through close to 50kg of filament.

I am still having trouble understanding the short 'melt-zone'

can you explain that in a bit more detail please?

Yeah, some people experience leaks, some people don't. It really depends on the hot end and the assembly.

As for the short "melt-zone", basically I am referring to the length of the heated portion of the hot end. A short "melt-zone" means a short heated portion, which translates to a smaller volume of molten filament in the hot end, which in turn results in less "ooze" from the nozzle. 'Ooze' is caused by gravity acting on the liquid molten filament pulling it down through the nozzle (you can test this by turning your printer upside down! No more ooze... but it is awkward having your printer upside down). By decreasing the volume of molten filament in the hot end, you are decreasing the pressure that gravity is exerting on the molten filament and therefore less plastic oozes out of the nozzle tip.

Hence, shorter "melt-zone" = less "ooze" ---------- longer "melt-zone" = more "ooze"

Eric

[Geoff]

Yeah, some people experience leaks, some people don't. It really depends on the hot end and the assembly.

As for the short "melt-zone", basically I am referring to the length of the heated portion of the hot end. A short "melt-zone" means a short heated portion, which translates to a smaller volume of molten filament in the hot end, which in turn results in less "ooze" from the nozzle. 'Ooze' is caused by gravity acting on the liquid molten filament pulling it down through the nozzle (you can test this by turning your printer upside down! No more ooze... but it is awkward having your printer upside down). By decreasing the volume of molten filament in the hot end, you are decreasing the pressure that gravity is exerting on the molten filament and therefore less plastic oozes out of the nozzle tip.

Hence, shorter "melt-zone" = less "ooze" ---------- longer "melt-zone" = more "ooze"

Eric

Yeah I get what you are saying, thanks clearing that up.

[RP Iron Man]

Hello Everyone,


The campaign is almost fully funded with over $2500 in contributions! Thanks to the latest contributors.


A few updates for you all. RepRap Core Developer Brad aka "Sublime" is working on a review and Michael "ZennmasterM" Zenner will receive his prototype for testing in the next few days! We will likely be seeing the reviews in the next week. I also managed to get in contact with Richard Horne. He is currently tied up with work but he happily agreed to do a review sometime in the next few weeks!


Recently I have been working on getting my website up and running. It should be up in the next few days so I will keep you guys informed when it goes up.


The components are starting to arrive! Earlier today I received the bulk order for the thermistors and resistor heaters for Prometheus. Most of the components are already on order so I am just waiting for them to arrive. The production run for the machined parts is well under way and going smoothly as planned.


Let's keep this campaign going!


Happy printing :-)


Eric