The PT Boat Forum

Forum Category: PT Boats of WWII

Forum Name: PT Boats - General

Topic: Help with HOLDEN8702

Luis' model work is excellent and I recently purchased his set of 80' Elco struts, rudders, and props in 1:16 scale for my hull, currently under construction.

Luis was able to redesign the rudder to the Elco 103 specifications and it looks fantastic. After several coats of primer and sanding, all of the 3D build lines are gone and pieces are ready for metal casting.

Unfortunately, after close measurement, the propellers are out of scale for 1:16 and don't measure 30" or 28" like the full scale originals.

I asked Luis if he could redo the propellers in the correct size so I could repurchase at his cost. He understood that to mean at his expense. I was simply asking if it would be possible to not pay the Shapeways designer marker up. Luis is from Spain and spanish is his native language. Apparently, I offended him and he is ignoring my emails clarifying my request.

Are there any other 3D designers on Shapeways that offer an Elco propeller that can be re-sized to 1:16? The finished part should measure about 1.875" - Thanks in advance.



Posted By: Greg Viggiano | Posted on: Aug 18, 2019 - 4:20am
Total Posts: 14 | Joined: Oct 1, 2012 - 6:36am

Hi Greg,
Several of the people that are creating 3D printed parts are now switching over to a new printer called the B9 Core Series. Unlike what you get from Shapeways the B9 Core series pulls a finished product out of a vat of resin. Sounds strange but the result is that you get a much smoother finish than you do with the Shapeways methods. The different is that the designer needs to adjust his drawings to support this process. The finished item will likely have sprue like supports to support the printed item. But compared to trying to remove all of those layer lines in the older methods, this is easy. We're also finding that these guys are selling their finished products for 15% to 20% less than the old method on Shapeways. Lower cost and better finished product. I have a few of these parts now and am having some made. This is the way to go. Go to his Facebook page "HOLDEN8702" and you can see what he's turning out with this machine. On that page check out the torpedo tube rack and torpedoes, as well as the 1/144 Jeeps.

Luis has invested in one of these machines. I'm not sure which he is using but keep in mind it's a $10k investment for the machine alone on his part.

What I would suggest is asking Luis if he would do this on his new Liquid Resin printer. Trust me, he wants to get away from Shapeways. He will offer you a fair price.

The other guy printing with this type of printer is Steve Larsen (aka Model Monkey). However he is not doing any new designs for ships/boats. Steve has done some PT Boat parts but is not designing anything new. You may have success with him printing with his new Liquid Resin printer though.

Your best bet is to work this out with Luis. He is a good person.

If you have any questions let me know.

David Waples

Posted By: David Waples | Posted on: Aug 25, 2019 - 6:44am
Total Posts: 1637 | Joined: Jan 2, 2007 - 9:55pm

Thanks David -

I've tried to email Luis a few times but he still hasn't responded to date (not a great way to win new customers). The other problem with Luis' propeller design is that the blade edges are much too blunt. The edges should be sharpened down to .025 for most 3D printers.

I found another 3D designer to help me draw a more accurate prop. My plan is to take the CAD file and have it printed and cast in metal from Xometry or i.materialise or stratasys.If the the finished parts look good and perform to spec, I'll make everything available to our PT Boat forum members.



Posted By: Greg Viggiano | Posted on: Aug 26, 2019 - 2:04pm
Total Posts: 14 | Joined: Oct 1, 2012 - 6:36am

Dave, who is using this method? I want to try a couple pieces made in the black resin (suitable for vulcanizing molds).


Posted By: alross2 | Posted on: Aug 28, 2019 - 7:51am
Total Posts: 919 | Joined: Oct 30, 2006 - 8:19pm

Hi Al and friends,
There are three designers who are operating their own liquid resin machines. I believe they are all operating B9 Core Series printers. They are all still selling on Shapeways and you can make contact with them there. All three designers sell their products with their liquid resin printers for less than they can sell the lower quality prints on Shapeways. Better quality print at a lower cost. You will need to contact them directly. I've worked with all three now and find them all great to work with. I think they're all friends as well.

The designers using these systems are...

Luis Hidalgo who operates on Shapeways as "HOLDEN8702" or "Panzer vs Tanks". You can go to Facebook by searching HOLDEN8702 and contact him that way as well. There are lots of photos of finished products on Facebook. I'm not sure which machine Luis is working with. Luis, if you're reading this perhaps you can tell us more about what you're doing.

Steve Larsen operates on Shapeways as "Model Monkey". Steve has two of these machines. They are the lower resolution but I have several of his parts and they are much improved over Shapeways best product. Smoother finishes and sharp detail. I'm sure you will be happy with the results. The only limitation is size. Real tiny parts are more of a challenge. For example reducing the size of his wonderful torpedo tubes from 1/72 to a smaller scale results in a loss of sharpness in the detail. Steve only puts out great quality products.

Simon Percival operates on Shapeways as "Micro Master". Simon's CAD work is AMAZING. Simon is just starting his Facebook page. His focus is mostly on British subjects but is also producing some German and US subjects. He is currently not taking on any new projects as he's extremely busy with a long list of requests. I've reached out to him to get permission to post some pictures he sent to me.

If you see one of their products on Shapeways they will likely convert them over to the liquid resin process. Just ask. Again, they are all great guys to work with and passionate about what they're doing.


David Waples

Posted By: David Waples | Posted on: Aug 31, 2019 - 7:10am
Total Posts: 1637 | Joined: Jan 2, 2007 - 9:55pm