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Filtering funnel

jcdammeyer said:
The owner of the site wants 10 pounds for the STL. Not even a STEP file. Get serious. Let's make this ourselves.
Click to expand...
The cost of $16.32 CAD to me is a lot expensive considering the simple design and material cost.
What I don't like about the design:
i) the outside part of the funnel is not higher then the inside part so if you fill to fast or overfill the funnel the fluid is just going to spill over the side.
ii) PLA is not a good material for long time exposure to gas or diesel.
The STL file is done just to make it more difficult to convert it to Step. Could probably be done but it would be faster just to do a new design.
 
John. What is so special in this funnel design or use ? Funnel from Dollarama plus mesh insert will not works?
 
I don't understand the design - the big holes in the inner shell. Maybe if it was intended to support a disposable filter medium like a Melita coffee maker? This is a thing in flow lines (called witches hats) but usually in funnels its a sized screen at the bottom of the funnel. If the holes are intending to be self filtering, maybe for food type mush or pulp, I suspect chunks of anything will easily make it through the big holes only to get stuck in the smaller annular space. Seems like there a couple similar designs so maybe I'm missing something. Or maybe a case of redundant replication, offshore 123 block syndrome.

1748442011308.png
 
PeterT said:
I don't understand the design - the big holes in the inner shell. Maybe if it was intended to support a disposable filter medium like a Melita coffee maker? This is a thing in flow lines (called witches hats) but usually in funnels its a sized screen at the bottom of the funnel. If the holes are intending to be self filtering, maybe for food type mush or pulp, I suspect chunks of anything will easily make it through the big holes only to get stuck in the smaller annular space. Seems like there a couple similar designs so maybe I'm missing something. Or maybe a case of redundant replication, offshore 123 block syndrome.

View attachment 65192
Click to expand...
When you filter using say a coffee filter the area around the bottom hole rapidly plugs up. On a coffee machine there are ribs going down towards the hole so the upper part of the filter is used too. That's the idea with this one. The liquid can also go through the sides rather than just the bottom.
 
gerritv said:
I always check printables first: https://www.printables.com/model/1156147-filter-funnel

A full search lists lots of options: https://www.printables.com/search/models?ctx=models&q=filter+funnel
Click to expand...
This one looks more interesting.

Coffee filter funnel, vase mode, parametric by kauzerei | Download free STL model | Printables.com

A funnel, in which a coffee filter fits perfectly. To be printed in vase mode | Download free 3D printable STL models
www.printables.com

I think I'll try this one.
 
Warlock said:
The cost of $16.32 CAD to me is a lot expensive considering the simple design and material cost.
What I don't like about the design:
i) the outside part of the funnel is not higher then the inside part so if you fill to fast or overfill the funnel the fluid is just going to spill over the side.
ii) PLA is not a good material for long time exposure to gas or diesel.
The STL file is done just to make it more difficult to convert it to Step. Could probably be done but it would be faster just to do a new design.
Click to expand...
One could use PETG or ABS. The idea behind this was filtering alcohol from resin printers to filter out the used resin. I don't have a resin printer but I though the idea was interesting. When I have used a coffee filter in a funnel it does plug up rapidly.
 
Doggggboy said:
I use paint filter cones. A little pricier but way sturdier than a coffee filter and can be easily reused multiple times with a quick brake kleen rinse.
Click to expand...
Busy printing one. I posted this question onto the AlibreCAD Support group and one of the senior members whipped up a funnel and posted the CAD file, @David can have a copy if he wants. Busy printing it now. Will be about 4:34PM PDT when it finishes.

1748460173433.png
 
I have a resin printer but I use water soluble resin as I cannot stand the smell of the IPA-soluble stuff. To be fair if my kid didn't use the printer once in a blue moon it would be on the curb.
 
jcdammeyer said:
When you filter using say a coffee filter the area around the bottom hole rapidly plugs up. On a coffee machine there are ribs going down towards the hole so the upper part of the filter is used too. That's the idea with this one. The liquid can also go through the sides rather than just the bottom.
Click to expand...

You are absolutely right, never noticed that before. I guess 'pour over' is the proper term, Melitta is just a brand. I have made a few kitchen gadgets & these filter holders might qualify for a better mouse trap. But it would have to be hand washed, I don't think PLA would survive the dishwasher heat cycle. Now if I could only get my family members to take a moment & consider what does & does not belong in a dishwasher especially in Surgical Instrument Cycle. Hint, expensive cutting knives, implements with wood that can warp, plastic that can crack, metal that can corrode which they wouldn't with a 20 second soapy scrub & hand rinse. Drives me mental.

1748468149437.png
1748468197293.png
 
PeterT said:
You are absolutely right, never noticed that before. I guess 'pour over' is the proper term, Melitta is just a brand. I have made a few kitchen gadgets & these filter holders might qualify for a better mouse trap. But it would have to be hand washed, I don't think PLA would survive the dishwasher heat cycle. Now if I could only get my family members to take a moment & consider what does & does not belong in a dishwasher especially in Surgical Instrument Cycle. Hint, expensive cutting knives, implements with wood that can warp, plastic that can crack, metal that can corrode which they wouldn't with a 20 second soapy scrub & hand rinse. Drives me mental.

View attachment 65206View attachment 65210
Click to expand...
Yeah. A friend put the cherry pitter i made for the in the dishwasher. Had to print them a new one.

I guess the funnel material will depend on what liquid one needs to filter.
 
Boy that is one robust solid funnel. However I think I agree with the prevailing opinion that the center part with the holes should be removable. With a tiny bit of spider webbing from the 3D printing operation I think this would be very difficult to clean.

FunnelPrint.jpg
 
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