AutoCAD Lineweights Not Plotting: Causes and Fixes
If assigned lineweights do not appear in PDF or paper, find out whether the intended thickness comes from the layer/object itself or from the CTB/STB. Then check the Page Setup options that control plotted lineweights and plot styles.
Start here — what you are going to do
Your goal: Restore the intended thin/medium/heavy hierarchy without changing every layer blindly.
Where to start: Choose one object that should clearly plot thin and one that should clearly plot heavy.
Beginner rule: Use two known samples. If both plot the same, trace the shared Page Setup or plot-style control before editing dozens of layers.
Step by step — follow this in AutoCAD
Step 1 — Read the two source objects
Where: Select the thin and heavy objects > Properties / Layer Properties.
Do this: Record layer, object Lineweight, color and Plot Style assignment.
Check: The intended source properties are different and known.
Step 2 — Identify CTB or STB mode
Where: Command line > PSTYLEMODE, then PAGESETUP > Plot Style Table.
Do this: Determine which plot-style system and table the Layout uses.
Check: You know whether a CTB/STB may override the object’s own lineweight.
Step 3 — Check the Page Setup plot options
Where: PAGESETUP > Modify > Plot Options.
Do this: Review Plot Object Lineweights and Plot with Plot Styles according to the office standard.
Check: The shared output switches are known.
Step 4 — Inspect the actual lineweight source
Where: CTB editor, STB editor, Layer Properties or object Properties.
Do this: For each test object, determine whether the plot style forces a lineweight or uses the object’s/layer’s lineweight.
Check: You can point to the control that should produce the thickness.
Step 5 — Preview a labeled calibration sample
Where: Ctrl+P > Preview.
Do this: Compare known samples such as 0.13, 0.25, 0.35 and 0.50 mm.
Check: A visible plotted hierarchy exists or the shared cause is confirmed.
Step 6 — Correct only the proven cause
Where: Named Page Setup, CTB/STB mapping or layer/object property.
Do this: Change the one setting that is actually wrong.
Check: Unrelated lineweights remain untouched.
Step 7 — Verify PDF and paper when important
Where: Plot a PDF and one physical sample if the deliverable is hardcopy-critical.
Do this: Compare with the known-good calibration reference.
Check: The fix is proven in final output.
Beginner example
A wall intended for 0.50 mm plots like a 0.13 mm furniture line. If their layer values differ, check whether the selected CTB maps both colors to the same lineweight or whether the Page Setup is not using the intended plot-style/lineweight workflow.
Understand what AutoCAD is doing
Several controls can contribute to plotted thickness
Layer/object lineweight, CTB/STB lineweight mapping and Page Setup plot options must be read together.
Plot with Plot Styles and Plot Object Lineweights are not the same idea
Autodesk documents Plot Object Lineweights as the option that plots assigned object/layer lineweights, while Plot with Plot Styles applies plot-style overrides and automatically plots lineweights under that workflow.
Screen display is not the final standard
AutoCAD lineweight display helps while drafting, but the reliable proof is Plot Preview, PDF and—when necessary—the actual printer or plotter.
Useful next guides: Lineweights · CTB Lineweight Mapping · Plot Object Lineweights · Lineweight Display vs Plot · Plot Styles & Lineweights
Common problems and what to check first
| What you see | What may be causing it | Check this first |
|---|---|---|
| All lines look the same | A shared CTB/STB or Page Setup setting flattens the hierarchy | Compare the two known thin/heavy samples. |
| Only one color is wrong | Its CTB row maps to the wrong lineweight | Inspect that ACI mapping. |
| Only one named style is wrong | The STB named style has the wrong lineweight | Inspect that style definition. |
| PDF is correct but paper is wrong | Printer/driver/media rendering differs | Do not alter CAD lineweights until the hardware stage is tested. |
When you need a more repeatable workflow
Keep a reusable lineweight calibration drawing and reference PDF/plot. Whenever a CTB/STB, Page Setup, PC3, driver or plotter changes, rerun the same test before approving production output.
Official Autodesk references
Interface labels can vary slightly by AutoCAD release and workspace. The Autodesk pages below document the core workflow used in this guide.
Frequently asked questions
Does LWDISPLAY control printing?
No. It controls how lineweights are displayed on screen.
Can CTB/STB override object lineweight?
Yes when the selected plot style defines a different plotted lineweight.
What is the fastest diagnostic?
Compare one known thin object and one known heavy object through the exact production Page Setup.
Explore more in AutoCAD Lineweights & Plot Thickness Guide.