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FAQ - Frequently Asked Questions

Thank you for visiting our FAQ page. If you need to ask a question, it is very likely that someone before you had to ask the same question.

However, if your question is not answered here, you can get help by sending us an email to We will respond as quickly as possible.

What is your connection to Linka and ScaleCast?

We are fans! We have no formal connection to the businesses whose websites are and, but we do admire their products. We hope that we will help them to prosper, as we also hope that we will bring new people, old and young, into the modelling hobby.

Do TRIM 2D and 3D Building Designer both work on a pc?

Yes. Both TRIM 2D and 3D Building Designers were designed on a pc using Windows 7.

Do TRIM 2D and 3D Building Designer both work on a MAC?

Yes. TRIM 2D Building Designer works on OpenOffice and when you download OpenOffice from their website, just make sure that you specify one of the "OS" download options. Similarly with SketchUp for TRIM 3D Building Designer.

Do TRIM 2D and 3D Building Designer both work on an iPad?

No. This product is not an app.

In TRIM 3D Building Designer I don't understand how to move the pieces.

Please look at our Intro Video B as a starting point.
Alternatively, if your question relates to the fact that you normally use "click and drag", which is the system used in our 2D Building Designer, you CAN use that technique, see the question below, but we find it tiring for the arm and hand. We prefer the following technique called "click, release and slide". Here you click on the "move" icon (fourarrows) then click on the face of the piece that you want to move, letting the left mouse button pop back up (release), then slide the mouse to place the piece where you want it. To leave the piece behind you just click and release on the left mouse button again. This technique is a lot less tiring than "click and drag".

I am just beginning to use this software. Do you have a slow version of the fast video on your website for TRIM 3D BD?

Yes, but you might find it more instructive to look at our Intro Video B. The video you are asking about has no audio track, but if you still want to see it - click here

I want to use "click and drag" to move the pieces in TRIM 3DBD. Can I?

Yes, here is the technique. At the top of your screen, click on Windows / Preferences / Drawing. Make sure that the tickbox next to "Auto-detect" is ticked, not the other two tickboxes. Click OK to go back to your design. Click on the "move" icon. Hover your cursor over the piece that you want to move, then "click and drag" as normal.

I don't want to build my model in plaster, just on screen. If I want some pieces that are not in the "components and extensions" file, will you create them for me?

Yes. We offer a bespoke piece creation service to customers. Click here for more info.

In TRIM 3D Building Designer I don't understand how your software works for the ScaleCast dormers. Why don't they have a sloping back to match the slope of the rooves?

We have a YouTube video on this topic - click here
The technique shown in this video also applies to chimneys.

In TRIM 3D Building Designer my model occasionally looks like a skeleton. What's happening?

This happens when you are overloading the program. It may be because you are orbiting or panning too fast and the math in the software cannot keep up, or because the graphics card is over-burdened, or because the graphics memory is over-burdened or simply because there are a lot of pieces in your model. Or maybe all those things! See also the answer to the next question. However, you do not need to worry. As I am sure you have already discovered, once you stop orbiting, the software quickly rebuilds the model and the skeleton disappears.

In TRIM 3D Building Designer sometimes SketchUp freezes. What is the problem?

We have a YouTube video on this topic - click here
It is just an extreme example of the problems that we identified in the previous question.

Are your pieces copies of the Linka and ScaleCast pieces?

Firstly, Linka and ScaleCast make and sell molds not pieces. We sell computer representations that are similar to the pieces that come out of those molds.

Secondly, the sizes of our pieces are different to those that come out of the molds, in order to accommodate the OpenOffice and SketchUp software that we use. If you plan to build a physical model from the molds and place it on a particular part of your train layout, for example, you will have to allow for these differences.

Thirdly, our pieces are coloured.

Overall, we think of our computer-based pieces as being rather like a "tribute band" is to the real band. Also, we like to think that we are supporting this hobby, as well as Linka and ScaleCast, by putting links in our website to their websites in the hope that modellers will make the jump to building physical models, not just screen versions. We receive no fees from either Linka or ScaleCast for these links, nor for any sale of their products.

Can I change the colors of the pieces? Do you not have any taste?

Yes, and No.

What are the physical sizes of your pieces compared to those that come out of the Linka / ScaleCast molds?

Our 2D pieces have a core of 30mms square plus 3mm tabs at each end, so the largest "core building brick" with ten tabs, measures 36mms wide by 30mms tall. The 3D pieces are the same size, width by height, and are 3mms thick.

The pieces that come out of the Linka and ScaleCast molds have the following sizes - the largest brick measures 35.2mms wide x 32.0mms tall x 3mms thick. So our pieces are slightly wider, and not quite as tall - but our pieces are, of course, consistent throughout our files.

In TRIM 3D Building Designer, I can't get the ScaleCast windows to sit on the face of the bricks, they seem to get absorbed into the face. What can I do?

We have a YouTube video on this topic - click here
Briefly, the technique is to grab hold of a point on the back of your window and then move it towards the wall until you see a label "On Face of Group".

In TRIM 3D Building Designer I don't understand how your software works for the chimneys. How do I cut out a triangular hole so that it fits on top of the roof?

Both chimneys and dormers are treated in the same way by the software. Have a look at this YouTube video and you will see that the solution is really easy - click here

In TRIM 3D Building Designer what are the angles at which I have to tilt the roof pieces?

Well, we have tilted them for you already in our ROOFS file, but I can tell you that the angles are as follows: for the smaller of the two heights, 24.444 degrees and for the taller 42.27 degrees. It depends on which way you are tilting the roof pieces, so you might find that the correct angle is 90 degrees minus those numbers.

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