I'm a new user to OpenSCAD (but not to coding).  I downloaded the following
model from Thingiverse:
Parametric Balloon Nozzle https://www.thingiverse.com/thing:2820765

When I open the SCAD file the designer included, it takes 1 min 22 seconds
just to show it.  At first I thought the software had crashed, but it was
just taking a long time to show the model.

Any time I make a change to a parameter, it again takes a long time to
render.  I've worked with other models and they render in seconds on my
computer (Intel Core i7).

Also, when I try to print the STL from Thingiverse (slicing via Cura),
something screws up the printer and it doesn't extrude any filament!

Looking through the posts I can see that there are ways to simplify a model,
but as a new user to this software, I could use some suggestions.

File is attached.  Thank you for any help!
BalloonRocketNozzle.scad
http://forum.openscad.org/file/t3178/BalloonRocketNozzle.scad

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I reduced the facet count ($fn) from 120 to 60 and it takes seconds to preview and render, even after a change.

On Monday, March 29, 2021, 7:14:50 PM EDT, JeffHaas <jeff.jh.haas@gmail.com> wrote:  

I'm a new user to OpenSCAD (but not to coding).  I downloaded the following model from Thingiverse:
Parametric Balloon Nozzle

When I open the SCAD file the designer included, it takes 1 min 22 seconds just to show it.  At first I thought the software had crashed, but it was just taking a long time to show the model.

Any time I make a change to a parameter, it again takes a long time to render.  I've worked with other models and they render in seconds on my computer (Intel Core i7).

Also, when I try to print the STL from Thingiverse (slicing via Cura), something screws up the printer and it doesn't extrude any filament!

Looking through the posts I can see that there are ways to simplify a model, but as a new user to this software, I could use some suggestions.

File is attached.  Thank you for any help!
BalloonRocketNozzle.scad

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Also replace Oskar's older library functions with these

module fillet(r) {
offset(r = -r) {
offset(delta = r) {
children();
}
}
}

module rounding(r) {
offset(r = r) {
offset(delta = -r) {
children();
}
}
}

Which use the newer built-in offset() which is much faster.
Well under 1s even with $fn=120. (but only use such high $fn for the final
render, not in dev.)

OpenSCAD Admin - email* me if you need anything,  or if I've done something stupid...

• on the Forum, click on my MichaelAtOz label, there is a link to email me.

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

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Thank you everyone for the fast replies!

These tips solved the issue, now it is blazingly fast.  I'm testing how
these print, and the first one went fine, so later I plan to upload a
"remix" of the files to Thingiverse that includes these suggestions for
improvements (with full credit to the posts on this forum) as well as
corrected STLs.

Later I'll work my way through the tutorials.

Thanks again for the help.

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