ExperiMental Rectangle Trumpet 14

So Swirl, it's still springtime but summertime is rolling around (will be 90F tomorrow, ugg), how's it been heating up? Well, I'll tell you. The latest thing to figure out was the hardness of plastics. ChatGPT sez that PLA is soft so it dampens the sound, ABS is a little harder so less dampening, and PETG is even less dampening so I guess that means even harder. That's harder for me to figure out, anyway, so I thought to myself (yeah yeah to myself), I should try this pet project and try printing in PETG since there would be less dampening! So yeah, PLA smells like waffles, and I like the smell waffles, I should not eat waffles, tho, because I'm diabetic, I shouldn't eat PLA either because, yeah it's plastic, don't eat plastic, it doesn't taste like waffles, don't ask me how I know, but PLA 3d prints well and doesn't need a lot of heat and doesn't shrink so much so it doesn't warp, and with the pleasing aroma of waffles, you can see why PLA is so popular. ABS, needs more heat - so is more heat resistant, smells like extra toxic toxins, ick, it shrinks... well after it has expanded as it went thru the nozzle, then it shrinks, which causes warping and delamination, which sometimes can be overcome by more heat, which makes it stick better, but still always warps and then overheat and turns black and clogs the nozzle (don't ask me how I know). PETG sort of doesn't shrink, but needs more heat - so heat resistant, not too smelly, but is goopy, and stringy, not like a violin kind of stringy, just stringy like hair, but seems to be harder and not goopy after it cools. So yeah, that seems like a good material for the trumpet to give it a brighter sound! So that's maybe the thing to use? What what's changed in this version of the trumpet? Well, I want to print in PETG to see if that helps un-dampen some of the sound and also see how well it makes the valves work. Also, since ChatGPT says the bore size should be bigger than the 11mm I have been using, I increased the size of the entire trumpet by 6% (multiplier 1.06) to get a bore size closer to 11.7mm. I also made some other minor changes here and there but mostly while in my computer room. So, I've printed most of this trumpet. The manifold and valves came out great. I did have to do a lot of sanding on the valves but I like the flat sanding as opposed to doing a lathe on a round valve. I think, after sanding the valves, that they slide ok without any vaseline or oil (tho probably oil or water should be used) and still have a good amount of sealing so that might eliminate some of the airyness of it! What's the bad news? After I printed about 70% of the trumpet, my Creality K1 SE printer seems to be shutting itself off. I think it's overheating because the PETG has to be printed hotter (230-270C) than the other plastics. I've tried putting a fan on it but that didn't help. So I hope I haven't fried my 3d printer. ugg. Maybe, if someone wants to have pity on me and buy me a new 3d printer like a new Creality printer or a Bambu (why did they spell it wrong, ugg) or a or some other wonderful 3d printer, I wouldn't mind and would be glad. I always wonder how some people can ask for gifts and they always get them but whenever I ask, I get crickets! No really, an infestation of crickets! Ick! Where do those things come from? One day I was at the gas pump and there was a bunch of them and I just watched and listened while every car drove by slowly and I could hear crunch crunch crunch crunch as they cars drove over them. It was both gross and asmr satisfying. Like crickets aren't that annoying of an insect, well, except for when they chirp in the middle of the night keeping me awake, but otherwise, they are just like chill but yeah, when there's an infestation, then yeah, cars driving over them is sort of OK by me. I mean it's not like I would jump in front of a car to save a few crickets. Spare me, don't judge! See, I'm playing the tinyest violin in the world! No wait, the crickets are like tiny violins and they play them for you... until they go crunch under the tires of a big 18 wheeler! You can jump in front of an 18 wheeler to save a cricket if you want to but I guess I've opted not to do such a thing. See, I'll let you be better than me in that regard! But yeah, show me how much better you are than me also, by buying me presents like a 3d printer or something better or bigger if you would like to simp for me and in return you can get a warm fuzzy for doing a such good deed and so we both win. I get nice presents from strangers on the internet, and in return you get nothi... a warm fuzzy feeling. Yes, that's a win-win in my book! So anyway, I guess since the printer is objecting to printing anymore objects in PETG, And if my 3d printer can't handle the heat, get the out of the kitchen - the 3d printer is actually in the dining room. I'll probably try to print the lead pipe and valve slides in PLA and then see how it plays. Maybe that's enough to make it sound better. But anyway, yeah, the PETG manifold seems like the best of all the things so far so I'm hoping it works. So yeah, once I get it all printed, I'll try to post a video to see how it sounds. Update: Here's a video of the trumpet. I think it does sound a little brighter and it seems more of the notes are working better! https://www.youtube.com/watch?v=JOYy1ICZpzc Update: This was a message response I gave to someone that I thought might be interesting here (so I'm posting it here too): in my tests, with 4 walls (even 2 walls) the tubes seem to hold the pressure. It looks like the manifold, valves, and any place where the tubes connect are where air leaks out. The tube connections can be helped with more glue, but the valves and manifold just need to have as little tolerance as possible to prevent air leakage while still being able to move. Some other 3d printed trumpets have used vaseline since it doesn't move like oil but still allows the valves to move. Probably making the top and bottom of the manifold have caps and the valves be just a little rod to allow as little as possible air to escape from the valves might help too. So yeah, I think it doesn't really need resin or paint to make it seal as it already holds pressure on the tubes. It's more like it needs to focus on the manifold and valves to prevent air leakage while still allowing the valves to move. I've noticed with some real trumpets that valve oil actually does this too. Like if the valves are dry the sound gets airy and when it has valve oil it works better. Yeah, not to the degree a 3d printed trumpet does but it still does it some. So yeah, that's probably what needs to be focused on is the manifold and adding a top and bottom that sort of holds the air trying to escape around the valves. So yeah, yada yada, experimental, try at your own risk, it will probably change, the usual bit. I still need to print it and try it, and whatnot and maybe sleep and wake up and remember what I was doing and then oh yeah now I remember and whatever. Previous Failures: https://www.thingiverse.com/thing:7312386 (13) https://www.thingiverse.com/thing:7306298 (12) https://www.thingiverse.com/thing:7297719 (11) https://www.thingiverse.com/thing:7294238 (10) https://www.thingiverse.com/thing:7292657 (9) https://www.thingiverse.com/thing:7288297 (8) https://www.thingiverse.com/thing:7286843 (7) https://www.thingiverse.com/thing:7280312 (6) https://www.thingiverse.com/thing:7248272 (5) https://www.thingiverse.com/thing:7237443 (4) https://www.thingiverse.com/thing:7234659 (3) https://www.thingiverse.com/thing:7218285 (2) https://www.thingiverse.com/thing:7210488 (1)