Diamond hotends heatsink September 12, 2017 06:45AM |
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Re: Diamond hotends heatsink September 12, 2017 07:45AM |
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Re: Diamond hotends heatsink September 12, 2017 07:54AM |
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Re: Diamond hotends heatsink September 12, 2017 11:04AM |
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Re: Diamond hotends heatsink September 12, 2017 03:04PM |
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Re: Diamond hotends heatsink September 12, 2017 03:55PM |
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Re: Diamond hotends heatsink September 12, 2017 06:07PM |
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fma
So, it is also directly heated by the nozzle, because of the direct contact with it! Plus, PTFE is a good thermal insulator; so how can the heatsink cool down the filament? Don't forget that I'm talking about the Lite6 version, where there is no heatbreak inside the heatsink... and this Diamond version works fine.
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Look at this hotend: [forums.reprap.org], there is not heatsink at all, and no need for a heatbreak, as carriage is in metal. And it works fine. And you can notice that the guy uses plastic caps pushfits: [forums.reprap.org]
BTW, I plan to put a fan on my 'heatsink' (more a heatbreak, in fact), which will also blow directly on the PTFE tubes. And, of course (and as I said), I will use full metal pushfits.
Re: Diamond hotends heatsink September 13, 2017 01:00AM |
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Re: Diamond hotends heatsink September 13, 2017 11:16AM |
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Re: Diamond hotends heatsink September 13, 2017 11:47AM |
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Using a PTFE liner reduces this friction and insulates the filament from the heat that does pass through the heatbreak
Re: Diamond hotends heatsink September 13, 2017 01:00PM |
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Re: Diamond hotends heatsink September 13, 2017 08:09PM |
Registered: 9 years ago Posts: 978 |
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fma
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Using a PTFE liner reduces this friction and insulates the filament from the heat that does pass through the heatbreak
So, the heatsinkbreak tends to heat up the filament, not to cool it down! That's exactly what I said before. So, removing the heatsinkbreak, and have fresh air on the PTFE can only improve things.
Ok, I launched the test without fan on the heatsink: so far (almost an hour later), it still extrudes at 10mm/s! The heatsink is very hot at the bottom, but not yet hot at the top (as you say, stainless steel has not a very good thermal conduction; I can still hold it in my hand)... I will insulate it to speed up the process (and to avoid the air cooling it down).
Re: Diamond hotends heatsink September 14, 2017 12:56AM |
Registered: 13 years ago Posts: 300 |
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frankvdh
The conservative part of me says that all the Reprappers who have gone before believed that they needed the heatsink -- they wouldn't have put it on otherwise. The other part of me says that maybe they were all wrong.
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Bear in mind too that heat is conducted up the filament, so that it's possible/likely that the filament inside the PTFE will be warmer than the PTFE, especially closer to the heater block.
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When the filament is feeding fast, the speed of the filament feed is subtracted from the conduction rate, giving a steep temperature gradient. The worst case is when the filament is stopped, e.g. whilst moving the head without extruding. Heat will conduct up the filament, conduct/radiate to the PTFE, from where it goes to the air. If the last step is too slow, the dynamic balance of the heat gradient will shift, and the PTFE and filament temperatures will rise. If the filament temperature rises too far, it will soften, expand, and potentially jam.
Re: Diamond hotends heatsink September 14, 2017 03:00AM |
Registered: 12 years ago Posts: 528 |
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Then came the Lite6. My feeling is that they build it as a drop in replacement of the E3Dv6: same size and so, so all existing design of extruders can use it
Re: Diamond hotends heatsink September 14, 2017 03:17AM |
Registered: 13 years ago Posts: 300 |
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jinx
the E3D team came up with the V6 lite to counteract the influx of clones on the market, and to give us budget builders/PLA users an affordable option for a genuine e3d hotend.
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FMA what was the test print ? was there a lot of retraction and at what speed, am just thinking that if fila allowed to heat up through the tube then the fila becomes elastic resulting in a sluggish retract leading to hairy prints! your method could work with a primitive object with a fast print where heat creeping aint to much of an issue, but hows it fairing with slow detailed prints?
now dont get me wrong am intrigued to how this goes and rooting for ya, but I have my doubts..
Re: Diamond hotends heatsink September 14, 2017 09:23AM |
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Re: Diamond hotends heatsink September 16, 2017 05:37AM |
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Re: Diamond hotends heatsink September 16, 2017 05:48AM |
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Re: Diamond hotends heatsink September 20, 2017 03:02AM |
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Re: Diamond hotends heatsink September 20, 2017 06:01AM |
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Re: Diamond hotends heatsink September 20, 2017 07:26AM |
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Re: Diamond hotends heatsink September 20, 2017 07:44AM |
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Re: Diamond hotends heatsink September 21, 2017 10:20AM |
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Re: Diamond hotends heatsink September 21, 2017 02:37PM |
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Re: Diamond hotends heatsink September 21, 2017 04:14PM |
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Re: Diamond hotends heatsink September 21, 2017 08:30PM |
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Re: Diamond hotends heatsink September 22, 2017 09:57AM |
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frankvdh
Various people have been working on ink-based colouring systems for quite a while, I think mostly focused on inkjet technology. A soon-to-be-released example is [www.xyzprinting.com]
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Getting back closer to the Diamond approach, I wonder about an "asymmetric" hot-end. Have one large (e.g. 3mm?) base-colour filament, and several smaller (1.75mm? or maybe 1mm?) filaments. These smaller filaments would really just be solid dye-carriers, to change the hue of the base colour. Perhaps they might be a different material from the main filament, but mixable with it. The physical properties of the dye-carrier material don't matter much; it just has to behave well during under extrusion and retraction. Pack as much dye as possible into the carriers, so that they are "super-intense"; hopefully the dye density would be 20 times what is needed to make a rich solid colour. Mix by volume up to 5% of various dye-carriers into 95% base filament to get any hue and saturation desired.
A transparent base would produce all kinds of translucent colours, including solid-looking colours if the dye density and the mixing were good enough. With a white base colour, you could produce shades from pale pastels through to maybe intense solid colour. Kindof like the way paint shops mix paint colours to the customer's requirement.
Re: Diamond hotends heatsink October 02, 2017 05:18AM |
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Re: Diamond hotends heatsink October 02, 2017 07:02AM |
Registered: 12 years ago Posts: 528 |
was hoping to find someone to do that, the e3d team mentions it the other day with a chat with Tomas that it was possible " just in case you missed it chatQuote
fma
This week-end I printed a small part, and at the end of the print, I just realized that the E3D Lite6 fan was unplugged!
Re: Diamond hotends heatsink October 02, 2017 08:10AM |
Registered: 13 years ago Posts: 300 |