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Portlight Hold-open Knobs
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Hi Everyone,
As some of the rubber knobs that hold our portlights open have gotten shredded, I spent some time looking for a suitable substitute but found there was no drop-in replacement. So I decided to make my own. I created a three dimensional model of one and started experimenting with materials on my 3D printer. I’m attaching a couple of photos. If anyone wants, I can share the file with you, or if there is interest I could probably print and send a set of 6 for something like €25 + postage. Cheers, Tilo Ambiente, SM 163 Port-Saint-Louis-du-Rhone |
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Tilo, I believe that there are none available anywhere, BUT, Bill Kinney posted this recently. I thought it was a great substitute: 
On Fri, Jan 27, 2023 at 8:50 AM Tilo & Jeannette Peters <ambiente.sm163@...> wrote: Hi Everyone, |
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Hi Bill, I saw that, but neither of us were terribly pleased with the aesthetics of it, plus that meant punching more holes in the ceiling. That’s why I decided to make my own. It’s a drop-in replacement that seems to function pretty well. It’s a bit stiffer than the original, but that may just because it is ridiculously cold in the boat right now. Enjoy your tropical vacation! Cheers, Tilo On 27 Jan 2023, at 16:11, CW Bill Rouse <brouse@...> wrote:
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Michael Winand
We are using a hair tie, silicon one ,tie the middle to form 2 loops, Michael Nebo sm251 On Sat, 28 Jan 2023, 2:50 am Tilo & Jeannette Peters, <ambiente.sm163@...> wrote:
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amelforme
Hi Tilo. Nice work on the stoppers. If you ever get around to producing them, I would like to buy at least 5 sets of six. Most of the boats I get for resale need at least a few replacements...
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All the best, Joel JOEL F. POTTER – CRUISING YACHT SPECIALIST, LLC The Experienced AMEL Guy UNSURPASSED AMEL MARKETING EXPERIENCE AND PRODUCT KNOWLEDGE OFFICE: 954-462-5869 Cell: 954-812-2485 -----Original Message-----
From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Tilo & Jeannette Peters Sent: Friday, January 27, 2023 9:51 AM To: main@amelyachtowners.groups.io Subject: [AmelYachtOwners] Portlight Hold-open Knobs Hi Everyone, As some of the rubber knobs that hold our portlights open have gotten shredded, I spent some time looking for a suitable substitute but found there was no drop-in replacement. So I decided to make my own. I created a three dimensional model of one and started experimenting with materials on my 3D printer. I’m attaching a couple of photos. If anyone wants, I can share the file with you, or if there is interest I could probably print and send a set of 6 for something like €25 + postage. Cheers, Tilo Ambiente, SM 163 Port-Saint-Louis-du-Rhone |
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Hi Joel,
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I’ve tried working with a material that should better act like the original rubber, but it won’t feed through my current printer. I ordered a new one a week ago—that one is also big enough to print screen frames for the portlights and maybe even the hatches because I can’t stand the usurious prices they’re charging for them—that should be able to handle the softer filament material. If you’re willing to wait for another week or two, I can see if the new material is significantly better and, if so, start fabbing them with that. Stefano, I’ll be driving to Sanremo next week to swap out a defective refrigerator, so if you want I could pop an envelope in the poste while I’m there. These would be made with the current TPU material that I’m working with. They are just a bit stiffer than the originals, but function well nonetheless. I’ll probably send out PayPal payment requests once I get that far if that works for you. Best, Tilo On 27 Jan 2023, at 23:13, amelforme <jfpottercys@...> wrote: |
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Hello everyone, but wouldn't the good old system used on all Amels from the 70s/80s be simpler to build? Mine are 43 years old and still work perfectly! Giorgio Ardrizzi Saudade III - Sharki #1 Currently in Martinica Il Sab 28 Gen 2023, 07:48 Tilo & Jeannette Peters <ambiente.sm163@...> ha scritto: Hi Joel, |
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Hi Tilo I would like to have your 3D file (sti?) And try to print some, as seversl of mine shows wear and team. Best, Lars Salvagny, Santorin #79 Sendt fra min Galaxy -------- Oprindelig besked -------- Fra: Tilo & Jeannette Peters <ambiente.sm163@...> Dato: 27.01.2023 16.50 (GMT+01:00) Til: main@amelyachtowners.groups.io Emne: Re: [AmelYachtOwners] Portlight Hold-open Knobs Hi Bill, I saw that, but neither of us were terribly pleased with the aesthetics of it, plus that meant punching more holes in the ceiling. That’s why I decided to make my own. It’s a drop-in replacement that seems to function pretty well. It’s a bit stiffer than the original, but that may just because it is ridiculously cold in the boat right now. Enjoy your tropical vacation! Cheers, Tilo On 27 Jan 2023, at 16:11, CW Bill Rouse <brouse@...> wrote:
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Hello Tilo,
can you let me know what material are you using with 3D printing? -- Juan de Zulueta OPHELIE X Super Maramu #32 |
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Hi Juan, I print these with TPU. I started with a flex filament that has a Shore Hardness of 95A, but that was so stiff that I had to make the objects thinner in order for them to be workable. Then I moved onto hardnesses of 90A, 60D, and then 83A. That worked okay and I was able to thicken up the material. Those are thicker and I believe they will be more durable, but I’d still prefer more flex. I just recently got hold of some 70A and I’m still trying to dial it in. I haven’t run the portlight hold opens yet, but I was able to print a bilge pump flapper valve for a friend that has similar flex characteristics to the original that had curled while having identical dimensions. Since Goiot doesn’t sell just the O-rings for their hatches and I didn’t feel like spending €79 per pair for O-rings when all the handles are in fine shape, I printed them—or at least something like them that does the job—with that 70A. From my research, it seems that O-rings are generally made of a material that has a hardness of 70A. I’m starting to see that having a good 3D printer and a selection of filaments will allow a sailor many more options than tend to be available normally. For instance, I’ve just upgraded my printer to be able to print carbon fiber blends and I have a spool of PETG/Carbon fiber that I’ll print a Ballooner release car with (I’m using PETG instead of nylon because it has better UV resistance). Cheers, Tilo Ambiente, SM 163 Port-Saint-Louis-du-Rhône On 10 May 2023, at 06:03, Juan de Zulueta via groups.io <jdezulueta@...> wrote:
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Paul Harries
Tilo
Please give details of your new printer as you are clearly an expert -- Paul Harries Prospective Amel Buyer |
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Mark Reardon
I have created a 3D printed model and first used TPU, which as Tilo mentioned, was far too hard to allow for the movement necessary to catch the portlight.
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Hi Tilo,
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Thanks for your detailed information. I am using the services of Xometry.eu, they proposed different options for flexibles materials : I am still not sure what would be the best . Polyurethane materials seems good options : EPU 40 or FPU 50? Any advice from your experience?
Juan de Zulueta +33680895892 sent from my Ipad. Le 10 mai 2023 à 10:04, Mark Reardon <markr25@...> a écrit :
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Juan de Zulueta OPHELIE X Super Maramu #32 |
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Hi Juan, Okay, so you’re using a service that uses resin printing. It’s a neat method but not suitable for boats, so I have no experience with the print technology. That being said, I would guess that you’d want to go with the EPU 40. The Shore D scale is much harder than the A scale, and what you really want is to have something that will flex before it breaks. As you can see, the EPU has twice the elongation prior to breaking than the FPU. While the True Silicone has an even higher stretch, I’d worry that it could be a bit too floppy for the job. I’m a big advocate of experimenting with fused deposition modeling or Fused Filament Fabrication (Stratisys forced the industry to change the name because they trademarked the “fused deposition modeling” term and viciously attacked any terminology that had any of those words in it—sorry, that’s an Intellectual Property Rant) because it is the most stable and, due to the patents on the technology having expired on both the process and the materials, has the most diversity in innovation. It is by far the most practical for sailors to make use of. As I’ve pointed out, there is great diversity even within the TPU filament variety that is out there, and that’s just for flexible stuff. Then there is the variety of reinforced filaments that use carbon fiber, fiberglass, aramid, and Kevlar. For other purposes, there is a vast choice of other filaments that can be used, for instance to print new lampshades, that have high aesthetic qualities. The cost of 3D printers is very reasonable these days. The first printer I bought over ten years ago cost me over €1,000 and was noisy, bulky, finicky, labor intensive, and had a small print volume. The ones I bought recently have roughly double and quadruple the print volume, have amazing print quality, are consistent once you get them dialed in, and can be disassembled in minutes to pack into a relatively small volume. On top of that, they are quiet; I have found myself in the situation where I had to sleep right next to these printers as they did a 24-hour print job and had no problem with the noise, whereas I couldn’t use my old printer in my office because the people in the next office over didn’t like all the noise it made. Oh, and the one that is my real workhorse printer cost me right around €250. If you’re already able to draw a 3D design, the printing part tends to be easier to get into. Best, Tilo On 10 May 2023, at 22:29, Juan de Zulueta via groups.io <jdezulueta@...> wrote:
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