heatsink for watercooled hotend, dimensions?
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Hello, i'd like to build up a small watercooled hotend. But i'm not sure if the heatsink is big enough for proper cooling!?
The following picture shows my first ideas.
The outer diameter of the (blue) heatsink is 19mm, the two fins are 1mm with a 1.5mm gap.
The complete heatsink is only 23.5mm long .
I have not yet defined where the water In and Out Ports will be. It is planned to make some small slots in the fins for minimal backpressure.Does anyone have experience with such a small heatsink in a watercooled system?
Thanks in advance for your feedbacks.Mankati FSXT+, DeltaTowerV2, CBot3D
www.cosmoprint.ch -
@cosmowave printing at PLA with a 0.4mm nozzle I have seen success with just a rubber tube around a thin wall tube as a heatsink. so its likely that a much smaller water contact surface will provide sufficient cooling, in comparison with an air-cooled hotend.
Duet Hardware Designer
www.duet3d.com -
@cosmowave You don't need fins for liquid cooling. Most of the designs you'll find on the internet are for adapting air cooled heat sinks which already have fins. But if you are starting from scratch, you don't need them. My 6 input hot end is liquid cooled so I have 6 heat breaks which happen to be PTFE lined but that's optional. So the heat breaks are simple tubes, 6m diameter which slide into a cooling block which has 6 off 6.05mm diameter holes. The coolant path is simply a couple of 5mm diameter holes which run horizontally between the vertical heat breaks, and which are connected with vertical holes forming the inlet and outlet. After multiple hours of printing, the temperature of the coolant has never yet risen above about 27 deg C and the temperature inside the part of the heat breaks that are inside the cooling block never gets above about 45 deg C.
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@deckingman @T3P3Tony thanks for you answers.
So i think my feeling was right and the cooling should be enough. -
@t3p3tony said in heatsink for watercooled hotend, dimensions?:
@cosmowave printing at PLA with a 0.4mm nozzle I have seen success with just a rubber tube around a thin wall tube as a heatsink. so its likely that a much smaller water contact surface will provide sufficient cooling, in comparison with an air-cooled hotend.
https://reprap.org/forum/read.php?152,824251 and in particular https://reprap.org/forum/file.php?152,file=105316 for example. Hard to imagine a smaller cold side heatsink.
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@achrn yes that's the one!
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@achrn holy sh.... this is really small and lightweight!
i think my design could also be a bit smaller...
But i'd like to keep my existing heatbreak, because it should be compatible with the air cooled system.
In the picture above you see, that the heatbreak is touching the pushfit. So i can't make the heatsink shorter.
I will thinking about to shorten the heatbreak a bit on the top side...thanks for the links!
Mankati FSXT+, DeltaTowerV2, CBot3D
www.cosmoprint.ch -
@cosmowave said in heatsink for watercooled hotend, dimensions?:
I will thinking about to shorten the heatbreak a bit on the top side...
That'll have some more advantages, like less nozzle tilt
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@o_lampe said in heatsink for watercooled hotend, dimensions?:
That'll have some more advantages, like less nozzle tilt
Yes, i know. That's the reason why i make this hotend.
Mankati FSXT+, DeltaTowerV2, CBot3D
www.cosmoprint.ch -
I see, that i can't make it much smaller with this concept.
My water In-Port needs nearly the space of the complete "cooling slot"!
