BricsCAD Plot Scale Wrong: Fix Prints That Are Too Small or Too Large
When a BricsCAD plot is too small or too large, first decide whether the error is in the Layout output scale, the viewport scale, Model Space units or the downstream PDF/printer scaling.
Beginner takeaway: Find which scale is wrong before changing anything: paper-space output, viewport, model-space plot, or printer/viewer.
What you need to understand first
Several different scale controls can produce similar symptoms. Randomly changing all of them makes the drawing harder to repair.
- A prepared Layout normally outputs at 1:1.
- Viewport scale controls the model view inside paper space.
- PDF viewers and printer drivers can enlarge or reduce a correct CAD file afterward.
Related guides: How to Plot a BricsCAD Layout at 1:1 Without Changing Viewport Scale, BricsCAD Viewport Scale: Set and Verify CAD Scales in Layouts, and CAD Plot Scale: Metric, Architectural & Engineering.
Step-by-step workflow
Step 1 — Identify workflow
Where: Layout or Model Space
Do this: Decide how the sheet was created.
Check: You know which scale controls should be active.
Step 2 — Check Layout/Page Setup
Where: PAGESETUP
Do this: For Layouts, match paper and use 1:1 output.
Check: Paper-space title block is real size.
Step 3 — Check viewport
Where: Viewport properties
Do this: Verify intended model-view scale.
Check: The viewport is correct and locked.
Step 4 — Create PDF baseline
Where: Print As PDF
Do this: Measure page and known dimension.
Check: CAD output is proven or disproven.
Step 5 — Check final printer/viewer
Where: Print dialog outside BricsCAD
Do this: Use Actual Size/100%.
Check: Physical output matches the PDF.
What usually goes wrong
| What you see | Likely layer | First check |
|---|---|---|
| Everything on sheet small | Layout plot scale/Fit | Return to 1:1 and correct paper. |
| Only model view wrong | Viewport scale | Correct viewport. |
| Model Space plot wrong | Units/plot scale | Verify drawing units. |
| PDF right, paper wrong | Viewer/driver scaling | Use Actual Size. |
Practical example
A 1:50 plan measures correctly in the PDF but is 3% small on paper. The BricsCAD viewport and Page Setup are already proven. Stop editing the DWG and turn off scaling in the PDF viewer/printer path.
What not to do
- Do not change viewport scale when the whole title block is also wrong.
- Do not use Fit to Paper to make the border look centered.
- Do not trust a ruler measurement from a PDF printed with unknown viewer settings.
Good office standard
Use a scale-diagnostic checklist that starts with Layout vs Model Space, then Page Setup, viewport, PDF and finally physical printer.
Quick verification before you move on
- Use one representative drawing or sheet, not a production batch.
- Verify page size, orientation and a known dimension.
- Compare Preview/PDF with the physical output when a printer is involved.
- Save the setting or set only after the result is repeatable.
Official references
Frequently asked questions
What is the first question to ask?
Is the sheet plotted from a prepared Layout or directly from Model Space?
Why measure the PDF before paper?
It separates BricsCAD output from downstream viewer/printer scaling.
If only one viewport is wrong, should I change plot scale?
No. Check that viewport’s scale.
Explore more in BricsCAD Printing & Plotting Guide.