Printable Trumpet Version 2

by LtDan, published

Printable Trumpet Version 2 by LtDan Apr 15, 2015


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This is my second go at designing a printable trumpet. Unfortunately none of the old pieces will be compatible with the new version aside from the mouthpiece I guess.

I finished this as of 7/14/15. It still doesn't sound great but that's not incredibly surprising. video

What I changed?

  • I increased the diameter of the tubes especially in the middle bit and made them circles instead of stupid ovals. Should still print fine without supports.

  • The entire thing should be more printer friendly. Most of the pieces are 5 inches or less with the tallest one being about 5.6 inches. If that is still an issue let me know.

  • You don't need rubber bands to hold the valves down assuming you find adequate springs to push the valves up. Still may need rubber bands to keep the tubes from wobbling about unless I or you make some sort of braces.


Springs -
I'm still working on what to do for this. I bought 3 springs at a hardware store but I can't find a part number for them. You're gonna want some kind of compression spring with a spring rate of about .7 lb/in this can vary I guess and I suggest just finding something that feels like the right pressure. You want it to have a compressed length of no more than 1 cm, a rest length of at least 17ish mm (preferably more). And you want a diameter of preferably larger than 10 mm but no more than 17 mm.

Let me know if you have questions about this, I know it's kind of specific.

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The model, it's pretty cool !

Did someone tried to sand the inside of the pipes ? If air flow circulates more easily the sound will be better.
Have you tried to print two half of each part of trumpet and stick the two parts with the glue ? It will be easier to sand it and in addition, you will be able to make the joints between the tubes finer.

I will try to print trumpet with this technic, I will give you my feedback on it :)

Consider the construction of mortar ammunition or piston of internal combustion engine to improve air leakage problem.

The ammunition/engine piston (with installed rings) has a series of grooves that create local turbulence formed by leaked air, and this turbulence stops air leakage to distribute through the grooves outside. This way you still have gap between valve and cylinder to move easily, while air leakage is (mostly) prevented.

Try this approach. All you need is just replace the valves with improved one.

Comments deleted.

It's not a fine musical instrument, but it sounds like a real trumpet. With some lowered expectations, I assume one could make some "music" with it. That's really cool.

I know very little about wind instruments. Is there something that could work as a pre-made drop-in valve?

Regarding springs, it would be great if the whole trumpet (doesn't have to be playable) could be scaled so that the springs in ball point Pens could be used. Can the model be scaled? And can a spring from pen be used?

The sound problems sound like they are due to leaks. Could be the valves leaking. It could also be any of the tubes or the joints. 3D printing will not always produce airtight tubes, so you'll have to find any leaks and fix them with some glue, acetone (if ABS) or lacquer. I had the same problem when I first printed my printable trombone, (search for printbone) and after I fixed the leaks it sounded great.

First designing a good trumpet without valves, then separately designing a good valve might be easier than everything at once.

If you elongate the valves and the casings, build in little lever type of springs in the sides of the casings at the bottom, and then taper the valves (this is why you would need to elongate the valves and casings) you wouldn't need to buy springs, as they would be integrated into the model. The little plastic levers won't like being squished when you depress the valve (because of the taper) so they will provide a force that's normal to the valve; this force will then be partially transformed into a vertical force because of the taper. You would need three little lever-spring-things for this to not mess with the orientation of the valve.

Wow! Is the most impressive thing I've seen lately. Congratulations is a great job, right now print one. Do you think some tubular parts of the trumpet can be replaced by some metal tube or PVC pipe?

You seem positively disappointed. You've done a great thing here. The sound will improve as printer tech progresses. Since it seems the primary issue is that it suffers from leakage, maybe there is an internal coating that could be applied to seal it all up?
This is a very cool thing, and I enjoyed just watching it play.

You may have more luck using rotary valves and ball bearings. That way the valve bearing can be made of metal rather than plastic, and greatly improve valve performance.

It's a lot of design work, I know- but it'll help valve performance tremendously.

I have an upgraded printrbot Play so my build area is 4x8x5 inches, could you make it fit that please?

You're in the good way compared to you're first try.
Repair air leaks and it will sound as a real instrument :)

why are there some parts with what looks like an identical part? EX; the bell

there are supports on some of them and others dont

I've had a couple of failures printing the valve casing - as it starts the 1st layer covering the supports, it has caught almost in the same place both times on a bit of loose plastic & knocked the x axis just a fraction :( Might take your stls and attempt to split into parts that I can glue together?

First of all thanks for sharing it.
I printed it out, but after join all the pieces together the trumpet doesn't work, ok i'm not a good musician but i was wondering if there something that i miss, i put the springs and then? is there something else? Gel or some other material to put on pistons because i have a little bit of play between piston and the main part.


For the most part 3d printed trumpets aren't going to work very well. The pistons I made fit fairly tight into the cylinders but used Vaseline on the pistons and that helps quite a bit but the sound that comes out of mine is still pretty bad. If you put a lot of vaseline on them it might help seal it better.

Awesome Design! I made your version one and will print soon this version.

Can you add a file with less parts for those of us who have a bigger printer? For example the bell and the 2 bell pipes as one part. I think this will improve the sound.

How much filament does this use? Is it more or less than 1 kg?

It just barely maxes out my small 500 gram scale so I would guess the whole thing weighs a little less than 600 grams.

One of my good friends is a trumpeter and just got married, let's try this thing.

I don't hear any sound.

Great design! Any updates on your print? Have you already finished printing yours and tried playing it?

Hey thanks! My printer was having some issues so I don't have good valves printed yet. They keep coming out too brittle. I've talked to a couple people who have been working on it and they might finish it before I do.

Hope you fix your printer's problems! I'm really excited to see the result of this trumpet, it would be really good if it sounded as good as it looks!