Revise the model without starting over
See this course’s project requirements
A revised desk-token CAD model, a dimensioned drawing, checked exchange files and a short handoff note.
Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.
What to include
- A 60×30×6 mm version A and 70×30×6 mm version B with an 8 mm through-hole at x10, y15.
- Fully constrained base and hole sketches, with dimensions checked after revision.
- A digital drawing with units, version and width/depth/thickness/diameter labels.
- STEP and PDF exports reopened and inspected.
- Native source and a readme recording the change and limitations.
Review and revise
Use these criteria to check your work and choose what to improve.
- Geometry follows the stated dimensions and origin.
- The revision changes the intended parameter without hiding errors.
- Views and labels communicate size clearly.
- The source and exported files agree.
Want more background?
The idea in everyday life
Use the completed 60×30×6 token. Revision B changes width to 70 mm; all other dimensions stay fixed.
A parametric history lets you change a rule and inspect all affected features.
Revise the model without starting over — guided practice
Make a controlled dimensional revision and compare versions.
Use the completed 60×30×6 token. Revision B changes width to 70 mm; all other dimensions stay fixed.
1. Keep version A
Save As desk-token-A.FCStd, then Save As desk-token-B.FCStd. Write A: 60×30×6 and hole x10, y15, d8 in the revision note.
You should see: Two distinct files preserve a before-state.
A reversible change is easier to diagnose.
2. Edit one rule
Double-click the base sketch, then double-click its 60 mm width constraint. Enter 70 mm. Close the sketch and recompute if prompted.
You should see: The body width becomes 70 mm.
The original feature supplies geometry to downstream features.
3. Check dependencies
Open the circle sketch. Confirm center x10, y15 and radius 4. Inspect Pocket for errors; close the sketch and view the opening from both sides.
You should see: The hole stays at its specified coordinates and remains through.
A successful recompute does not replace a dimension check.
4. Explain the change
Record new right margin: 70−10−4=56 mm. Compare A’s 46 mm. Save B. If an attachment error appears, return to A and repeat carefully, noting the error rather than hiding it.
You should see: Only width and the right margin change in the specification.
A controlled revision identifies intended and unintended effects.
What to finish
Revision A/B models and a checked change note.
Watch for this
Assuming every downstream feature updates correctly.
How can I tell I understand it?
Explain the result, reproduce the procedure, and complete the changed-input check.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
You’ll get an explanation for each answer. Signed in? Your results save to your account.
Pass the check. We’ll save the progress.
Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.
Go to the knowledge checkOptional course overview video · same video as Lesson 1
FreeCAD 1.0 Ultimate Beginners Crash Course in 1 hour for 3D printing CAD Lesson / Tutorial
From MangoJelly Solutions for FreeCAD. Watch here or open it on YouTube .
Optional course overview. Follow the written steps below at your own pace.Tools, templates, and lesson sources
Tools and templates
Tools open in a new tab so you can keep your place here.
Sources and further reading
Explore the references behind this lesson.
Source & access notes · checked 2026-09-12
Read author-maintained mirror: sketches, constraints, Pad and Pocket. Mirror describes older releases; do not follow its obsolete assembly discussion.
Access: Public reading without a paid account; reviewed September 12, 2026.
Reuse: Manual identifies CC BY 4.0; link and original fixture used. FreeCAD software is LGPL; learner files remain theirs.
Source & access notes · checked 2026-09-12
Read substantive page text and examples.
Access: Public reading without a paid account; reviewed September 12, 2026.
Reuse: Link only. Lessons and practice assets are original; free access does not grant permission to copy the provider's material.
Report a problem with this lesson
Tell us what went wrong. Please leave out personal information and private project contents.