3D printing shenanigans

I believe there are some HFH interests on the subjects of CAD modeling and 3D printing. Starting a thread. Feel free to comment and/or add.

I'll start with some random stuff:

My daughter loves having rotini pasta for lunch every school day. Perfect portion starts with 1 1/2 cup of dry rotini. Every morning, I had to unstack the measuring cups. Use the 1 cup, the 1/2 cup and restack. Too much work in the morning! It then occurred to me that I can just sketched up and 3D printed a 1 1/2 measuring cup. Problem solved. :)
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A few weeks ago, I was spending a lot of time modeling the various multi-cell horns. My one finger used for clicking the mouse button became quite painful (un-expected occupational hazard :(). So, measured up the offending finger, made a sketch and 3D printed a finger joint splint. Problem solved. :)

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This one perhaps is a little more useful. ;)

Modeled and printed the grille for my '72 2002. I want for the grille color to match the car color. Did not want to paint over a perfectly good chrome grille. Orange was just a test print.
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Man, I love 2002's, such a classic design.

3d printing opens some pretty awesome opportunities, both for finished product and rapid design/prototyping.
 
3d printing opens some pretty awesome opportunities,
True that.

I've been poking at this idea today - not quite done yet. Modified KS12024 with six cells. So, the spread improves to 75 degrees from the original 50 degrees horizontal. Frequency should be the same. The throat geometry is a bit tough. Have not fully worked it out. The six horn
cells will be broken up into 3 pieces of 2 cells. Each pieces should be printable on a decent size printer.

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True that.

I've been poking at this idea today - not quite done yet. Modified KS12024 with six cells. So, the spread improves to 75 degrees from the original 50 degrees horizontal. Frequency should be the same. The throat geometry is a bit tough. Have not fully worked it out. The six horn
cells will be broken up into 3 pieces of 2 cells. Each pieces should be printable on a decent size printer.

View attachment 19165

Looks like, from a quick glance, that the cells could be made with wood easily. Print the throat and adapter bit perhaps and mate them.
 
Looks like, from a quick glance, that the cells could be made with wood easily. Print the throat and adapter bit perhaps and mate them.
I believe you are correct. But, I really want to see if we can come up with a design that most local 3D shops can print. Let's see where this goes. I figured out the throat/adapter piece. I will work on it some more and see if I can print it out.

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JohnVF

Administrator
Staff member
I did this passive iphone horn some time ago. Simple linear expansion - folded horn with a total length of about 17". Perhaps it's time for a make-over with a tractrix expansion. ;)

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I'd totally buy that if it were commercially available. I make paper horns for my iPhone all the time during conference calls so that everybody can hear the other end of the 'line'.
 
I'd totally buy that if it were commercially available. I make paper horns for my iPhone all the time during conference calls so that everybody can hear the other end of the 'line'.
I uploaded the model on Thingiverse. At that time, my goal was to come up with a design where no support is needed for 3D printing. Give me a few days. Perhaps I can improve it a bit.
 

JohnVF

Administrator
Staff member
Now I just need to find a 3D printer. There's one two offices down..but its a work-use thing.
 

Audionut

Next Round Is On Me
This all looks like great fun!
Moved my post from the multicell horn area; Curious as to how you arrived at your larger machine (assuming it came second). I am starting my research in hopes of purchasing my own soon.
 
This all looks like great fun!
Moved my post from the multicell horn area; Curious as to how you arrived at your larger machine (assuming it came second). I am starting my research in hopes of purchasing my own soon.
So, I'am cheap; I don't like to pay full price if I can help it.

Bought the smaller printer off the local CL. Learned a few thing while using it. Hung out at the manufacturer's FB user group to learn from people who were smarter than me. It turned out that the manufacturer (Chinese) did not have a repair/service center in the US. Now and then, they ran specials for customer returns. The larger machine was brand new - sort of. The customer could not get it to work. So, it was offered at half price of new. These machines are extremely finicky to set up. But, they are relatively simple electronically and mechanically. So, I took a chance! Tech support from China was awesome. English was a bit of a problem. But, nothing unsurmountable. Turned out the machine only needed a simple spacer to locate the Z-axis sensor. :)

If you are looking for a 3D printer, these features are very desire-able: heated bed, enclosed workspace, self leveling bed, and high temp extruder upgradeable.

Have fun.
 
iPhone/Smart phone passive horn. So, I've been working on the design below with two goals: 1) minimize using "support" while 3D printing, and 2) use actual expansion curves rather than the standard linear expansion. Exponential is first. Tractrix will be next.

This concept is modular. The cradle holds the phone and directs the sound down to the open table top and then out. The horn piece is linear in the vertical plane, but is exponential in the horizontal plane. The bottom of the horn piece is open - The surface of any table top is part of the horn! (Concept shamelessly stolen from the VDCH. ;)) The cradle will need some support while being printed. But, the horn can be printed without using support.

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