Prusa Mini Detachable Cooling Duct for silicone sock (Update)
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Clearanced fan duct allowing to use silicone socks on stock hotends without melting.
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This is a variation of BoothyBoothy's awesome "Detachable Cooling Duct Assembly V2".
I observed that on my Prusa Mini Clone with default "original-ish" hotend, the cooling duct was contacted by the silicone sock and sagged quite a bit, especially printing the first few layers without any fan active. I used PETG but heat transferred with direct contact is just too much.
So I altered his duct and added 2mm clearance for the additional silicone sock on the hotend. I also flattened the fan duct 1mm to be compatible with bondtech-heatbreaks, as they seem to be a little bit shorter. Of course the air flow will suffer a bit as I had to add some inner walls when notching, but I think the impact should not be noticeable.
His carriage mount will still contact the hotend but in my experience this is no issue as it is not really load bearing at its hottest point. Maybe I will upload an updated design later. If this is a perceived issue you can just file down the part contacting the silicone sock a little.
Update:
- redesigned nozzle structural areas as it was still sagging with time when printing PETG
- now requires to print fan mount as its not compatible with BoothyBoothy's mount
Update 2:
- better airflow focus