Weekend Update 1/7/24

[C855B]

@John , here's that bridge printed on a Photon D2, also on the build plate. Resin is AnyCubic Craftsman gray. Default Chitubox settings for the D2.



Given my experience and relative frustrations with a Photon original, the D2 is a total game changer.

[Chris333]

I surprised about 1/4th of the way up those side girders there is no warp line from the change in tension at the height the center beams stop printing. Looks good.

[John]

@John , here's that bridge printed on a Photon D2, also on the build plate. Resin is AnyCubic Craftsman gray. Default Chitubox settings for the D2.



Given my experience and relative frustrations with a Photon original, the D2 is a total game changer.

Looks good Mike .. My first print on my Mono had some holes near the bottom of the large girders .. I took a look at the SCAD code from the creator file posted on Thingiverse - and the OG author specifies the steelthickness  parameter at .23 something milimiters -- which doesnt work well with my machine .. so I created a repaired file where I increased the girder thickness to .60 which should print better ..  still a work in progress and I need to figure out how he manipulates the thicknesses .. for now, I may just use the SCAD sketch to generate the style and length - then go back and retrofit the additional thicknesses were needed .. and print at an angle to reduce the suction off the plate.  I've uploaded the modified .stl to Tinkercad. Either way, it's a good alternative to the Atlas, Central Valley, Kato, and ME bridges available.

[C855B]

Mine also has a couple of holes at that bottom joint, but they’re so small paint would take care of them. What impresses me about the D2 is one of the things that impressed Bryan - the ability to hold very thin walls. The first print I did after the supplied test print was signal heads. Aside from most of them failing because I made the support cones too thin, the targets and visors that made it (I didn’t measure) had to be ~0.004”.

Chris, one of the most noticeable things during printing is there is no “pop” as the print pulls away from the FEP. Don’t know if it’s the different resin formulation or just the way this printer works, but you’re right. I like things that “just work” with no futzing around!

[BCR 570]

May I ask which program you drew the bridge in?  I would love to learn how to do this so I can draw the plate girder bridge for my diorama as it is the best way to get the rivet detail.

Tim

[Peachymike]

May I ask which program you drew the bridge in?  I would love to learn how to do this so I can draw the plate girder bridge for my diorama as it is the best way to get the rivet detail.

Tim
[/quote
Hi Tim, I would suggest Fusion 360, there is a hobbyist version that is free. The learning curve is a little steep, but I can help you with basics. Give me incentive to get back at the N2 project to finish your version.
Mike

[C855B]

May I ask which program you drew the bridge in?  I would love to learn how to do this so I can draw the plate girder bridge for my diorama as it is the best way to get the rivet detail.

I am assuming by the .scad file that came with the .stl download, the program is OpenSCAD. It is not WYSIWYG.

[BCR 570]

Thank you!  Yes I would really like to learn how to do this as I have to do the CAD work for it to be counted for AP judging.

And yes I was going to ask how my N2b is coming . . . . .


Tim

[Peachymike]

Thank you!  Yes I would really like to learn how to do this as I have to do the CAD work for it to be counted for AP judging.

And yes I was going to ask how my N2b is coming . . . . .


Tim

Emailed you, we can set something up…

[BCR 570]

Thank you!

Tim

[John]

May I ask which program you drew the bridge in?  I would love to learn how to do this so I can draw the plate girder bridge for my diorama as it is the best way to get the rivet detail.

Tim

Tim .. this is a variation of a bridge posted on Tinkercad ..   https://www.thingiverse.com/thing:4902597

You would need to download OpenSCAD and use it to generate the bridge - the script allows you to customize length , height , etc

[Scottl]

@John Interesting, I did not realize there was a programming style of 3D modelling.  I plan to use that bridge design too and this makes modification possible.  Thanks for the link

[pjm20]

In Solidworks you can use equations and global variables to quickly change dimensions and make designs universal.

[John]

@John Interesting, I did not realize there was a programming style of 3D modelling.  I plan to use that bridge design too and this makes modification possible.  Thanks for the link

There are some flaws in that script. It makes the side truss too thin to print properly with consistency.  For this particular design I’m going to put together some 72’ 62’ and 50’ foot variations with both the straight ends and the rounded end.  You’re welcome to the files after I get them done

[C855B]

There are some flaws in that script. It makes the side truss too thin to print properly with consistency.  For this particular design I’m going to put together some 72’ 62’ and 50’ foot variations with both the straight ends and the rounded end.  You’re welcome to the files after I get them done

That would be awesome, John. I will be availing myself of them. Thanks!