Replacement part for model railway wagon

[fred_dot_u]

You'll want to avoid SketchUp, as it's well known that it generates unprintable STL files. I'm a big fan of OpenSCAD, but for your project, you may have better luck with Fusion 360 or a similar sketch based program. Matter control and Tinkercad are founded on manipulating primitives (as is OpenSCAD) and can make things challenging. OnShape is another sketch based program that should work.

You've done a great job of presenting the necessary measurements, a key factor in building a model and half the work for something like Fusion 360 or OnShape.

Even though Fusion 360 has changed some of the aspects of the license, it's still free for hobbyists and worth a look.

[bkk-bkk]

Hello Fred
Thanks for your reply. I have spent a couple of days checking out Fusion 360 and some of the videos on YouTube. It seems to be the one for me! especially the sketch and extrude features as well as the general organisation of the available features and work flow. Still haven't found the best way to construct the battle shield shape but I'm sure it will come to me eventually.
Incidentally, Fusion 360 is free for non-commercial users for one year and then Autodesk require an annual subscription. Also, the free version was modified today 1 Oct 20 to exclude some of its features but nothing too drastic I understand.
Thanks again Brian (bkk-bkk)