Trying to print a funnel, bad results

[curious aardvark]

the problem is obvious :-)

well it is if you've printed as many funnels as I have lol

The angle on the funnel part is extremely steep.
It's verging on the absolute unsupported printability of an fdm machine.

All you can really do without supports is slow the printspeed right down and increase the print area cooling.
If it's already on 100% then consider addig a second fan and duct or a better -focussed - duct.

And of course micro files and sandingblocks/paper are you friend in tidying it up :-)

You will note that there are NO pictures of an actual printed funnel and no makes listed.

Looks like someone's designed it, posted it and THEN tried to print it and failed.

What's it for ? if the exact size and dimensions are not critical, would take a couple minutes to redesign so that it would print a lot more easily.

failing that I think I've got a full parametric funnel design script for openscad around somewhere. failing that it'll only take me a couple minutes to write one :-)

so that's what I did lol

// curious aardvarks funnel generator
// All measurements are in Millimetres

$fn=50; // sets 'roundness'. For a hexagonal funnel - set to 6. Octagonal 8 and so on.

// Adjust values below to make your funnel

eds=10; // external diameter of the spout
wt=2; // wall thickness
md=25; // widest diameter of mouth
hs=15; // height of spout
hm=15; // height of mouth

difference(){
union() {
cylinder(d=eds,h=hs);
translate([0,0,hs]) cylinder(d1=eds, d2=md,h=hm);
} // end union
union() {
cylinder(d=eds-wt*2,h=hs);
translate([0,0,hs]) cylinder(d1=eds-wt*2, d2=md-wt*2,h=hm);
} // end union
} // end diff

Copy everything in the box and paste it into openscad.

Adjust measurements, then press f5 for a quick preview and f6 for a fully generated model that you can export as an stl - press f7 - for printing :-)
(other formats are available)

The above parameters make a funnel this shape:

CA-funnel-generator-sample.jpg

And that folks is why they taught you algebra at school !
Well in all my life, openscad scripts are the ONLY place I've ever used it.

Openscad download page: https://www.openscad.org/downloads.html

Go make some funnels !

Tips for funnels with very steep overhangs/underhangs
make the wall thicker.
Use smaller layer heights - ie: 0.1 rather than 0.2 or 0.3
make sure your slicer is set to print outlines from the inside to the outside.

Tip for openscad - when setting wall thickness - remember to multiply by 2 - cos it's got a wall each side.

I usually print funnels wide side down - that way yopu get the maximum surface area on the printbed.