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免費3D建模軟體FreeCAD能取代付費CAD嗎
想畫一個零件、一台機器外殼或一間房子的立體圖,腦中第一個念頭是打開某套商業CAD軟體,但看到訂閱費用就縮手了。於是開始找免費方案,下載了幾個號稱「免費」的軟體,不是功能被鎖住,就是介面複雜到不知道從哪裡開始。你只是想把手上的想法變成可以轉檔、可以修改的3D模型,卻卡在軟體選擇這一步。
一般人遇到這個狀況,最直接的做法是找盜版或試用版,但試用期一過就斷糧,盜版又有安全疑慮。另一條路是改用2D繪圖軟體硬畫,但平面圖無法呈現立體結構,修改尺寸時更是噩夢。這類工具的切入點是「參數化建模」——把尺寸和約束條件變成可調整的參數,改一個數字,整個模型跟著更新,這正是工程設計最需要的核心能力。
01FreeCAD 到底能做什麼?
它是一套免費開源的參數化3D CAD軟體,主要用於產品設計、機械工程和建築用途。你可以用它建立帶有約束條件的2D草圖,再拉伸或旋轉成3D實體,也能做布林運算把物件合併或挖空。內建多個工作台,涵蓋零件設計、2D製圖、網格處理、CAM加工路徑和FEM結構分析,等於從建模到製造前置作業都包了。
02這套軟體能不能畫2D工程圖?
可以。它內建Draft工作台,專門用來建立2D繪圖和佈局,也能把3D模型投影成2D視圖輸出。支援DXF格式,方便跟其他2D CAD軟體交換檔案。不過它的2D功能定位是輔助3D設計,如果你只需要純2D繪圖,LibreCAD這類專門軟體可能更輕量、更容易上手。
03畫好的模型可以轉成哪些檔案格式?
支援的格式相當多,包括STEP、IGES、STL、OBJ、DXF等常見的交換格式。STEP和IGES適合跟其他CAD軟體交換實體模型,STL和OBJ適合丟進3D列印或動畫軟體使用。這代表你不需要擔心檔案打不開,幾乎所有主流CAD和3D軟體都能接收這些格式。
04它能不能寫程式自動化操作?
可以,內建Python腳本支援。你可以用Python自動重複性的建模任務、批次處理檔案、建立自訂工作流程,甚至開發自己的工具。這對工程師來說是很大的加分項,等於把這套軟體變成可以量身打造的平台。不過前提是你得會寫Python,不會的話這項功能暫時用不上。
05介面會不會很難上手?
介面採用工作台(Workbench)架構,不同任務切換到不同工作台,例如草圖用Sketcher、零件設計用Part Design。工具列和選單都可以自訂,樹狀結構讓專案導覽很直覺。但官方自己也承認,對初學者來說選項和工具很多,學習曲線偏陡,而且整體介面設計比商業CAD軟體老舊。建議先看官方教學文件,從簡單專案開始練。
06完全沒用過CAD的人適合用嗎?
可以用,但要有心理準備。官方FAQ明確說它適合初學者,但學習曲線很陡。建議先找官方教學文件或線上教學影片,從畫一個簡單的方塊或螺絲開始,逐步熟悉草圖約束和參數設定的邏輯。如果完全沒有3D建模概念,可能會比用SketchUp這類直覺型軟體花更多時間才能畫出第一個成品。
07可以用在專業工作上嗎?
可以,官方FAQ提到許多使用者把它用在專業的工程和設計領域。它具備參數化建模、CAM路徑產生、FEM分析這些專業功能,而且支援STEP、IGES這類工業標準格式,跟其他專業軟體協作沒問題。不過官方也坦言,它缺少商業軟體如SolidWorks或AutoCAD的一些進階功能和精緻度,關鍵專案前最好先自行驗證功能是否足夠。
08介面只有英文,看不懂怎麼辦?
這套軟體的介面語系只有英文,沒有內建繁體中文。如果你英文閱讀有障礙,操作上會比較吃力,因為工作台名稱、工具提示、錯誤訊息都是英文。目前官方資料沒有提到中文介面的選項,需要自行確認是否有社群提供中文化套件,或考慮改用有中文介面的其他CAD軟體。
09跟商業CAD軟體比起來會不會差很多?
功能面它很完整,參數建模、2D草圖、3D實體、CAM、FEM都有,但官方自己承認缺少商業軟體的一些進階能力和打磨。例如介面設計較老舊、偶爾會有開源軟體常見的小臭蟲。如果你是做簡單到中複雜度的機械零件或產品設計,它夠用;但如果是大型組裝、複雜曲面或需要高度穩定性的專業環境,商業軟體還是比較可靠。
10我的舊電腦跑得動嗎?
官方建議的最低需求是雙核心2GHz處理器、4GB記憶體、OpenGL相容顯示卡、2GB硬碟空間。記憶體8GB會比較順暢。以現代標準來看門檻不高,一般文書機都能跑。但如果你要處理大型組裝或複雜曲面模型,顯示卡和記憶體還是會影響流暢度,建議先確認你的顯示卡驅動有更新到最新版。
11它跟SketchUp比起來哪個比較多人用?
在評分人數上,SketchUp Make有234人評分,FreeCAD只有128人評分,SketchUp的使用者基數明顯較大。不過兩者的定位不同,SketchUp偏向直覺建模和概念設計,FreeCAD偏向參數化工程設計。如果你需要精確尺寸和可調整參數,FreeCAD比較合適;如果只是快速拉體塊、做建築外觀概念,SketchUp可能更容易上手。
12這套軟體還有人在維護嗎?
有,而且更新相當頻繁。根據收錄的版本紀錄,從2009年至今持續釋出更新,最近一年內有4次更新、兩年內有7次,屬於活躍開發的專案。官方也強調有活躍的社群和完整的文件支援,不用擔心軟體被遺棄。開源軟體的好處是就算官方停滯,社群也能接手繼續開發。
下載與官方連結
FreeCAD_0.12.5284_x86_setup.msi · 連結指向軟體原廠
版本紀錄
- 2026-09-28 FreeCAD 1.1.4 495 MB
- 2026-07-26 FreeCAD 1.1.3 495 MB
- 2026-07-24 FreeCAD 1.1.2 495 MB
再看 5 筆
- 2026-04-15 FreeCAD 1.1.1 495 MB
- 2026-03-25 FreeCAD 1.1.0 495 MB
- 2025-08-06 FreeCAD 1.0.2 408 MB
- 2025-05-16 FreeCAD 1.0.1 468 MB
- 2024-11-19 FreeCAD 1.0.0 382 MB
這一版改了什麼
What's new in this version:
- [Bug] Crash during close of tab with mouse event attached - closed.
- [Bug] FreeCAD crashes when calling Part.makeFilledFace with list of lines (wmayer) - closed.
- [Bug] Sketcher: Crash on undoing inside the polyline tool (logari81) - closed.
- [Bug] modifying arc in sketcher will lead to a crash - closed.
- [Bug] python console: buggy CallTips completion for members, starting with underscore ('_') - closed.
- [Bug] DXF problem (yorikvanhavre) - closed.
- [Bug] Exporting to DXF causes zero vector length exception (yorikvanhavre) - closed.
- [Bug] Try to change the macro location causes crash. - closed.
- [Feature] Stringent user interface behavior (Jriegel) - closed.
- [Feature] Start Workbench (Jriegel) - closed.
- [Feature] Make python workbenches able to handle edit mode (Jriegel) - closed.
- [Feature] Make the task panel accessible from python (wmayer) - closed.
- [Feature] Further Development in PartDesign (Jriegel) - closed.
- [Feature] Developing Sketcher (Jriegel) - closed.
- [Feature] Fix constraint (Jriegel) - closed.
- [Feature] Sketcher construction line (Jriegel) - closed.
- [Feature] Arc in Sketcher (Jriegel) - closed.
- [Bug] Fails to obey three lines with one point constrains after point constraint obtimize (Jriegel) - closed.
- [Feature] Deletion of constraints and geometry - closed.
- [Feature] Switch from QSvg to QWebKit - closed.
- [Bug] exporting *stl files from File -> Export - closed.
- [Bug] Wrong background of SVG pixmaps (wmayer) - closed.
- [Feature] Sketcher: Strange axes behavior (Jriegel) - closed.
- [Bug] Draft preferences for tolerance are not applied or saved correctly. (yorikvanhavre) - closed.
- [Bug] Sketcher: The 'Fit Content to the Screen' must ignore not-user-created entities - closed.
- [Bug] Arch Icons - closed.
- [Bug] a pad fails to produce a valid solid from a valid sketch - closed.
- [Bug] Fails to remember toolbar icon size - closed.
- [Bug] Use of Pad/Pocket on some sketch profiles disables selection/preselection highlighting (wmayer) - closed.
- [Bug] Illegal storage access crash when canceling pad - closed.
- [Feature] in "Part" added create "vertex" to the create primitives dialgue gui - closed.
- [Patch] new Icons for Part Work Bench, Ruled Surface, Shape Info, and Create Primitives - closed.
- [Feature] FreeCAD hangs on various operations (wmayer) - closed.
- [Feature] abstract Draft modifiers and add them in preferences (yorikvanhavre) - closed.
- [Bug] 2d Drafting bug - Should not allow the deletion of an object that is currently being drawn (yorikvanhavre) - closed.
- [Feature] Turn the Draft workplane marker into something more powerful (yorikvanhavre) - closed.
- [Feature] build an OBJ exporter that respects Part Faces (yorikvanhavre) - closed.
- [Bug] Coincident+ tangent constrain doesn't work well (Sketcher) (Jriegel) - closed.
- [Feature] extend Draft snap (yorikvanhavre) - closed.
- [Feature] More snap tools (yorikvanhavre) - closed.
- [Bug] Non-XY Draft Dimensions are not displaying correctly when put on a Drawing View (yorikvanhavre) - closed.
- [Patch] Bugfix: Draft - Trim / Extend (yorikvanhavre) - closed.
- [Bug] makePipe: unwanted twisting of section along helix used as wire - closed.
- [Bug] PartDesign - change axis issue - closed.
- [Bug] Sketcher inverts horizontal and vertical constraints in YZ plane (Jriegel) - closed.
- [Bug] Possible manipulator/dragger bug (wmayer) - closed.
- [Bug] Draft Shift-constrain doesn't respect working plane (yorikvanhavre) - closed.
- [Feature] Produces a 2D view of an object in the document, not on a Drawing page (yorikvanhavre) - closed.
- [Feature] Add snap-to-grid functionality to the draft module (yorikvanhavre) - closed.
- [Bug] Subselection don't work on PythonFeature objects (wmayer) - closed.
- [Bug] In Draft edit mode, snapping a control point snaps to itself first, preventing snapping to anything else (yorikvanhavre) - closed.
- [Feature] moving the "amount of corners" list box to another place (yorikvanhavre) - closed.
- [Feature] make Draft objects subclasses of Part2D objects (yorikvanhavre) - closed.
- [Feature] make Draft objects usable with PartDesign (yorikvanhavre) - closed.
- [Bug] print or type set margin error (yorikvanhavre) - closed.
- [Bug] Draft editmode is not closed properly when deleting an object (yorikvanhavre) - closed.
- [Feature] Make the Draft SVG importer treat BSplines (yorikvanhavre) - closed.
- [Feature] Allow extruding faces on parts (yorikvanhavre) - closed.
- [Feature] Add an option to select base objects after Draft copy operation (yorikvanhavre) - closed.
- [Bug] Trimex doesn't work with arcs (yorikvanhavre) - closed.
- [Bug] Mac Interface window style setting not saved (wmayer) - closed.
- [Bug] missing Mod search path in OS X build - closed.
- [Feature] Boolean operations on faces (Jriegel) - closed.
- [Bug] Sketcher:: Create polyline, perform Undo whilst adding lineSegment or wire and then adding another wire crashes (Jriegel) - closed.
- [Bug] Sketcher: trying to drag a solved & locked sketch crashes FreeCAD (logari81) - closed.
- [Feature] OpenCollada interface (yorikvanhavre) - closed.
- [Feature] Drawing objects by clicking in the 3Dview (yorikvanhavre) - closed.
- [Bug] Sketcher: Auto constrains add one coincident constraint too many to a closed polyline - closed.
- [Bug] Missing attribute radius on Edit>Duplicate selection for circle - closed.
- [Bug] 'Duplicate Selection' not copying all attributes (wmayer) - closed.
- [Bug] Another preselection highlight bug (Jriegel) - closed.
- [Feature] Use color information from STEP format (Jriegel) - closed.
- [Bug] Deleting Radius Crashes - closed.
- [Bug] Sketcher: Using right click menu prevents receiving selectionChanged messages - closed.
- [Feature] Keep separable IGES geometry - closed.
- [Bug] Drawing View for fused cube+cylinder and cube+sphere not shown correctly - closed.
- [Bug] View of Pad in Drawing looks weird - closed.
- [Feature] make the startpage translatable (yorikvanhavre) - closed.
- [Bug] cosmetics (yorikvanhavre) - closed.
- [Feature] Arch module - Mesh to Arch conversion (yorikvanhavre) - closed.
- [Feature] Arch module - allow to add/remove arch objects from cells (yorikvanhavre) - closed.
- [Feature] Allow solid to have different colors for every face (Jriegel) - closed.
- [Bug] Sketcher Module: Undo command after creating geometry with constraints e.g. polyline / rectange crashes (Jriegel) - closed.
- [Bug] Untranslatable header of task watchers (Jriegel) - closed.
- [Feature] allow snapping in skatcher (Jriegel) - closed.
- [Feature] copy visual attributes on parametric operations - closed.
- [Feature] Make offset work on open polylines (yorikvanhavre) - closed.
- [Feature] Allow to subclass python extension classes inside python - closed.
- [Feature] PDF print feature always defaults to same directory - closed.
- [Bug] Sketcher - When pading I get unclosed shape - closed.
- [Bug] Loading a sketch after a save fails. - closed.
- [Bug] FreeCad does not compile with eigen 3.0.1 - closed.
- [Bug] Fix build-systems - closed.
- [Bug] v0.12 b4693 - closed.
- [Bug] Sketch shows different shabe as pad - closed.
- [Bug] Sketch, pad and pocket look weird on mirrored shapes - closed.
- [Bug] Robot module doesn't compile with Eigen3 (Jriegel) - closed.
- [Bug] cannot use macros with non-standard names - closed.
- [Bug] Translated Solids move before Boolean (wmayer) - closed.
- [Feature] Surface modelling (wmayer) - closed.
- [Bug] Povray export seems to work on active object only (wmayer) - closed.
- [Feature] Additional 3D navigation modes - closed.
- [Bug] 2D drafting crash - closed.
- [Feature] Choose a more intuitive naming scheme for duplicated objects (wmayer) - closed.
- [Bug] user.cfg problem - closed.
- [Feature] Useful extension of the show/hide functionality (wmayer) - closed.
- [Bug] Problem exporting in STEP format - closed.
- [Feature] Using thumbnail for FreeCAD document icon - closed.
- [Feature] Implement alternative CAD navigation style (wmayer) - closed.
- [Feature] Update CATIA-like rotation for CAD navigation - closed.
- [Bug] Error on loading a document with a drawing (Jriegel) - closed.
- [Bug] freecad won't compile with gcc 4.6: undefined reference to `Gui:: - closed.
- [Bug] Freecad does not compile with gcc 4.6.0 because of missing include in zipios++/directory.h - closed.
- [Bug] Shift does not work for distances (yorikvanhavre) - closed.
- [Bug] bugs in Draft Scale (yorikvanhavre) - closed.
- [Feature] make Draft copy keep dependency relationships of their original object (yorikvanhavre) - closed.
- [Feature] Dimension of angles and radiuses/diameters (yorikvanhavre) - closed.
- [Feature] Group Spline/Wire AddPoint and DelPoint tools inside Edit mode (yorikvanhavre) - closed.
- [Feature] Change the Draft upgrade behaviour to produce a more intelligent Group object (yorikvanhavre) - closed.
- [Bug] Automatic workplanes when drawing against a surface (yorikvanhavre) - closed.
- [Feature] Transfer Draft objects SVG properties to their DrawingView objects (yorikvanhavre) - closed.
- [Feature] Turntable camera rotation - closed.
- [Feature] toolbar size option (wmayer) - closed.
- [Feature] add a button to the Report View to switch on/off the redirection of python errors (yorikvanhavre) - closed.
- [Feature] allow Part Extrude to extrude in the direction of the face normal - closed.
- [Bug] moving of arc does not work properly (logari81) - closed.
- [Bug] Can't select points in Sketcher (Jriegel) - closed.
- [Bug] Exported dxf totally broken when re-importing (yorikvanhavre) - closed.
- [Feature] support 3DFACES in dxf import & export (yorikvanhavre) - closed.
- [Bug] New Circle tool in Sketcher causes problems editing Pad and Pocket features (wmayer) - closed.
- [Feature] rename box (wmayer) - closed.
- [Bug] Sketcher Crashes after you delete all lines, but leave few constraints. - closed.
- [Feature] Export color information to STEP (AP214) - closed.
- [Bug] STEP AP214 export crashes FreeCAD on win7 (Jriegel) - closed.
- [Feature] BSpline does not want on a "Drawing sheet" (wmayer) - closed.
- [Bug] Undo/redo of custom python objects doesn't work (wmayer) - closed.
- [Bug] Snapping + Ctrl does not work in 3D (yorikvanhavre) - closed.
- [Bug] CPU 100% when snapping (yorikvanhavre) - closed.
- [Feature] Move the "Copy" check box to another place (yorikvanhavre) - closed.
- [Feature] move the "Filled" check box to another place (yorikvanhavre) - closed.