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Another alternative MK3 part cooling duct  

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rob.s
(@rob-s)
Eminent Member
Another alternative MK3 part cooling duct

I've had a go at modelling up a alternative part cooling duct, which I've uploaded to Thingiverse - https://www.thingiverse.com/thing:2808683

It has a small viewing recess so that you have a slightly easier time checking out the all important first layer, which also helps push the air from the blower around to each side of the duct. The internals are also sloped to point the air flow to (in theory) just below the nozzle.

It prints without support, and so far, my PETG printed version is holding up to PLA temperatures. That being said I would recommend PC or ABS....

The Thingiverse files also has the Fusion 360 model, but I only added a few cosmetic fillets/chamfers/text to the part. The rest was all done with Rhino - I can upload that somewhere if anyone wants it.

P.S. Extrudr's MF-PETG in Neon Orange.

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Posted : 27/02/2018 10:21 pm
thrawn86
(@thrawn86)
Honorable Member
Re: Another alternative MK3 part cooling duct

clever, it looks like worst case scenario would be that it performs similar to stock with better visibility. Going to give this one a shot.

Ideally I think I'd want one duct on either side (like a Taz) to get even amounts of cooling on the front and back, rather than the current great cooling front, meh cooling sides, and no cooling rear.

Posted : 28/02/2018 6:06 am
steve.p7
(@steve-p7)
Active Member
Re: Another alternative MK3 part cooling duct

Thinking along the same lines as Curtis with hoping for at least stock performance plus added visibility. I printed it in cf nylon and now using it as a nice relatively quick print to tune those layer change blobs out. This stuff likes to ooze 🙂

Steve

Posted : 28/02/2018 6:24 am
rob.s
(@rob-s)
Eminent Member
Topic starter answered:
Re: Another alternative MK3 part cooling duct

It’ll be fairly easy to add a second model with no front cooling, I might be able to make the viewing trench a bit wider and higher too.

That CF Nylon look fantastic 😮

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Posted : 28/02/2018 9:22 am
Bigdogbro1
(@bigdogbro1)
Estimable Member
Re: Another alternative MK3 part cooling duct

Hey,

Could someone please give further information on the CF material and use on a MK3 and its source. Is this part available in step file? Looks great! Thanks.

MK3 Kit, Designed, built 4x4 CNC Plasma Cutting Table, Motorcycles Bigdogbro's Adventures
http://www.youtube.com/channel/UC5djrxBeeOKB9_6rHnn6G8A...
Posted : 28/02/2018 2:12 pm
steve.p7
(@steve-p7)
Active Member
Re: Another alternative MK3 part cooling duct


It’ll be fairly easy to add a second model with no front cooling, I might be able to make the viewing trench a bit wider and higher too.

That CF Nylon look fantastic 😮

I'd look forward to printing a design with a larger viewing window and cooling that extends more to the back of the nozzle 🙂


Hey,

Could someone please give further information on the CF material and use on a MK3 and its source. Is this part available in step file? Looks great! Thanks.

Full disclosure, I print the eSun ePA-CF (cf nylon) material on an unheated garolite sheet on my CR-10, not the MK3. I don't yet want to risk the PEI sheet on more exotic materials until replacements can be purchased. That being said, if you can get it to stick it's not terribly difficult to print with. On the CR-10 I'm using a 270 degree nozzle and the already mentioned garolite bed. If I was going to try on the MK3 I'd probably use glue stick or watered down white school glue either directly on the PEI sheet or on tape.

Steve

Posted : 28/02/2018 5:00 pm
Bigdogbro1
(@bigdogbro1)
Estimable Member
Re: Another alternative MK3 part cooling duct

I agree that the blue tape would be a wise choice for now. I want to print out some 3-axis gimbal brackets for the motorcycle and feel PETG is a better choice than PLA.

MK3 Kit, Designed, built 4x4 CNC Plasma Cutting Table, Motorcycles Bigdogbro's Adventures
http://www.youtube.com/channel/UC5djrxBeeOKB9_6rHnn6G8A...
Posted : 28/02/2018 8:19 pm
dan.v4
(@dan-v4)
New Member
Re: Another alternative MK3 part cooling duct

I'm printing it now. Hopefully it performs better than the default. Thank you! I'll try to follow up with comparison photos of 3D Benchy's for the default and this nozzle.

Posted : 01/03/2018 6:14 am
rob.s
(@rob-s)
Eminent Member
Topic starter answered:
Re: Another alternative MK3 part cooling duct

I'm updating this to see what it is like with only 2 exits at the ends on the arms. I've not yet printed this to test, so no STL just yet (maybe tomorrow). This is what I've done so far - The last image is the air path. The nozzle view is taller and wider too.

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Posted : 04/03/2018 12:17 am
thrawn86
(@thrawn86)
Honorable Member
Re: Another alternative MK3 part cooling duct


I'm updating this to see what it is like with only 2 exits at the ends on the arms. I've not yet printed this to test, so no STL just yet (maybe tomorrow). This is what I've done so far - The last image is the air path. The nozzle view is taller and wider too.

looks promising, I have been playing with your last design and it seems to well at least as well as stock. Also downloaded the mk3 STEP files and messed around a bit too but I'm super new with fusion360 so its just a learning project for now.

I have noticed (or rather it FEELS like) that most of the airflow on the stock design seems to be concentrated on a point a few mm below and 1-2cm behind the nozzle.

Posted : 04/03/2018 12:25 am
matthew.m20
(@matthew-m20)
Active Member
Re: Another alternative MK3 part cooling duct

Unfortunately, it'll be nearly impossible to really verify if it's any better without modeling the airflow dynamics. It's really easy to accidentally create turbulence, and if you create too much pressure, you will reduce the airflow of the fan, and you won't even know it.

Posted : 04/03/2018 12:33 am
rob.s
(@rob-s)
Eminent Member
Topic starter answered:
Re: Another alternative MK3 part cooling duct


Unfortunately, it'll be nearly impossible to really verify if it's any better without modeling the airflow dynamics. It's really easy to accidentally create turbulence, and if you create too much pressure, you will reduce the airflow of the fan, and you won't even know it.

Very true, I used SolidWork 2018 Premium at work (amongst far too many other bits of software), but haven’t ever ventured in to to simulation parts of it. I’m currently on paternity leave at the moment, but when I get back to work I can take a look. At home I’m limited to Rhino, Nappies and Fusion360.

Testing at the moment is me just printing parts with overhangs and seeing if there are improvements.

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Posted : 04/03/2018 10:18 am
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