Wow! Great comment! I'm not knowledgeable enough to speak authoritatively about your question. But that never stops an idiot from opening his mouth. :) I like the direction of your thinking. The extruded plastic is far less stiff than wood. So increasing the cross section with the isogrid (Thank to @jonjon737 for the terminology) would be a way of using design to create equivalent performance in the final instrument. If both the wood and plastic front face soundboard are equally stiff then they should vibrate with similar behavior. Of course there will be a frequency by frequency difference because wood and plastic have different resonances but generally speaking the sound will be equivalent. The only thing left to figure out then is the loudness. A resonator is a very loud instrument because the cone has very little mass. A similar effect could be achieve with the isogrid top. The top skin could be just two layers thick. I made mine 4 layers thick in this project just because I wanted durability, but I think 2 layers would be plenty strong. In my judgement I think for strength and sound quality Jeff Kerr has the winning design technique. I also think it is important to accomplish the isogrid as an infill material. This way the printer lays down the grid as long continuous lines which greatly increases strength/stiffness. If you drew up a custom isogrid the slicer would not run continuous 'fibers' from wall to wall of the Uke face.

P.S. I realized that i didn't even answer your question about disrupting wave patterns. I'm 100% sure it will have some effect. It's a trade-off low inertial mass for superior vibration or put a skin on both sides of the isogrid and have superior resonance in the chamber. My intuition tells me that intertial mass is more important. Those grid lines are pretty thin. Slicing through the sound waves like a knife and not disturbing them too much before they hit the front face and rebound. Also there is a challenge in getting a good inner skin. The isogrid is spaced pretty widely. That's a lot of bridging for the printer to accomplish. You would need at least 3 layers in my experience to get a good top surface. Still, 5 layers of skin isn't too bad. I have 4 layers on this current design and it sounds quite good. Worth experimenting with? Yeah probably.

Thank you Joel! This was very nice of you. I hope you have a great day.

Thank you! I hope you have a great day.

PLA is just so ideal because of the ease of printing and the stiffness. PETG with CF might match the stiffness and printability...you make a good point.

N+1 I forgot about that. 😆

This video took me two weeks to make and fewer people are clicking on it than the opinion videos I can record and edit in a day. I don't know if this is caused by the algorithm or if it is a reflection on to the audience. Strategically speaking I should make the videos that get the most views for the least effort. I knew this video wouldn't perform very well the whole time I was making it. It was kind of a labor of love. All that is to say that you probably shouldn't expect more content like this from me. It's too much effort and does nothing to help the channel. Passion projects never pay the bills. IDK Maybe some external website will pick it up and blow it up. When I get featured by hackaday it always helps. Maybe there's some instrument building website that will link the video.

@@DesignPrototypeTest I will upvote and watch your positive videos while ignoring your opinion pieces. Not because I think you are 100% wrong (I also don't think you are 100% right) but because that is what I want to see and promote. This is also the reason why I will probably try to start creating content again. Hope more people do this so we can focus on this as something positive again. As a sidenote, I still want to get rid of fusion360 in my flow and would prefer something like rhino with a one time purchase, does rino allow less aesthetic inclined people the sketch extrude way fusion does? FreeCAD is my other go to but it's soo much slower to work with

@@budhiw Rhino has many workflows and ways of doing things. What I was showing is a workflow commonly called "surfacing" which is different than when you use that word referring to CNC machining. Rhino is infact more user friendly (easier and faster) than F360 or Solidworks for the "sketch to extrude" workflow you are talking about. B/C in Rhino you don't have to click into a separate screen to work on your 2D sketch. It all happens in the same 3D workspace. I showed this functionality in another video I made about Rhino a while back: kzfaq.info/get/bejne/prF8hreCyKy4hX0.html

Fret*

Dude! Thanks!. Funny how we can be blind to such simple things sometimes.

Don't forget about the double neck 8 string and 4 string Uke.

Look who's talking. I saw you welding a go-cart for your kiddo. :) Metal welding is a lot more impressive.

Mosquito patent moment

A good question. Most artists struggle with this issue. If you deviate too far from what is known and loved the audience revolts.

One of the good (and bad) things about acetone is its high volatility. It evaporates quickly. I would worry about limonene permanently plasticizing HIPS, because you can only wipe off solvent that is not already absorbed.

@@AwestrikeFearofGods You could probably bake the part at around 70-80c to get rid of the limonene but I'm not sure about the fumes that makes, would more than likely negate the advantage of not needing to use stinky acetone.

@@georg6876 Plasticized HIPS would be very soft at temperatures high enough to evaporate limonene in a reasonable time. By the time the limonene diffuses to the surface and evaporates, the part would have already slumped into a worthless blob.

@@AwestrikeFearofGods Womp Womp. Could still print it in abs and do acetone smoothing, but I'd think printing such a large part in abs would be way too difficult and the amount of acetone needed would probably knock you out with the fumes.

@@georg6876 How about acetone smoothing HIPS in a well-ventilated area? Acetone is only about as toxic as isopropyl alcohol. It is frequently used for nail polish remover.

Nylon is a semi-flexible. The CF makes it stiffer but it enough? Siffness is key to a functional instrument. Better would be CF Polycarbonate but WHOOO BOY! Talk about layer separation and problems with shrinkage. That's far more of a challenge than I'm willing to take. Would probably require a very nice large format printer inside a 100°-150°C heated chamber.

My experience with CF polycarbonate is that it is actually quite dimensionally stable, CF fill really helps resist warping

Trying to make it 100% 3D printed except for the strings. The truss rod has already been done before. Many times.

www.youtube.com/@lobocnc (Jeff Kerr)

Similar culture that I was raised in and I've lived in all the same cities as him. Some of my friends in HS absolutely revered DK. I can completely understand why you would think this and I consider it a compliment. Have a great day!

@@DesignPrototypeTest It was most surely intended as a complement😇, Class of 86. DK, Jello and the PMRC🤐 a.k.a. Tipper Gore was and still is a huge influence in how I entered the "adult's" world. 🤨 Fight the Power!🦾

Distortion. It's a feature not a bug. 😁

kzfaq.info/get/bejne/r6h_hMqhrN2whZc.html

It's just fun and feels good to play one. We can't all be eight string guitar Metalheads trying to be the most technical god-like players.

In the words of Nelson: Ha Ha! It has to be printed face down so it just barely fits on a 300mm² bed. Maybe when Prusa sends me my review unit of the PrusaXL I can revisit the project and make one that sounds better.

Sorry I should have pronounced it ookoolele, but I've never been to Hawaii.

i enjoyed it lol i would love to print it@@DesignPrototypeTest

Congratulations you have assembled the quintessential s#!t sandwich: Compliment-Insult-Compliment. It sounds like you compare yourself to strangers on the internet and when they display skills you don't have it makes you feel bad. But then you tell yourself "At least I can print better than him. I should tell him that I can...Hmm. How should I word this?" Anyone can achieve high quality with a little effort. I decided that it wasn't worth the effort in this project. Which is a decision I should have made again instead of replying to your ego vomit. If you want to stop creative people from posting projects like this one you are doing exactly the right thing. It's the lord's work really; making sure nobody has to see creative or unique things. Maybe when everyone who can do things that you can't do stops posting you will be able to feel good about yourself. Or maybe not. Thankfully I don't know a thing about you beyond this comment.

​@@DesignPrototypeTest Creative people are often open-minded, given your answer, you're not one of them. Being open-minded also means accepting being told the truth even if you don't like it. You can't stand criticism, that's all, even when it's based on fact. On this project, your impressions are of poor quality, it is undeniable. You spent time modeling the instrument in 3D, it's a shame not to have spent time presenting an object with a good quality finish. It's still the base on a chain oriented 3d printing.Thankfully I don't know a thing about you beyond some vidéos.

Any suggestions for this one?

Also, if you were observant you would have noticed that I took down all of my opinion videos about Chinese printers as well. All that's left up is the high performing"technical" videos.

What a liar you are, naughty boy!😘 You still have the Mingda Magician Pro video still up! Hahaha I guess your still just a joke! 🤡

You still also have your rant on your prusa i3 mark3s+ video. 🤣🤣🤣 I'm crying!!! 🤣🤣🤣