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IDProjectCategoryView StatusLast Update
0003554FreeCADBugpublic2021-02-06 06:50
Reporterbzipitidoo Assigned To 
Status feedbackResolutionopen 
PlatformPCOSLinuxOS Versionkernel 4.11.8
Product Version0.17 
Target Version0.20 
Summary0003554: fillet fails on cut torus
DescriptionBeen using python scripting to make parts. Fillet is finicky. Sometimes it works. Sometimes it gives an error message:

Part.OCCError: BRep_API: command not done

and the fillet fails. It can fail on a simple piece, but work on a more complicated shape that is other shapes fused with the simple piece.

Investigating, the simplest fail I found so far is a cut down torus-- sliced in half like a bagel, then cut in half again. See the included python script.
Steps To Reproduce
#makeFillet fails in this python script:

import math
import Part
from FreeCAD import Base

DEG2RAD = math.pi/180.0
rd = 72
origin = Base.Vector(0,0,0)
znorm = Base.Vector(0,0,1)
xnorm = Base.Vector(1,0,0)

boxcorner = Base.Vector(-rd*2,-rd*2,-rd*2)
cutbox = Part.makeBox(rd*4,rd*2,rd*4,boxcorner,znorm)

fulltorus = Part.makeTorus(rd-4,4,origin,xnorm,0,360)
halftorus = fulltorus.cut(cutbox)

basecyl = Part.makeCylinder(rd+2,9,origin,xnorm)
halftorus = halftorus.cut(basecyl)

#This fillet fails
filletht = halftorus.makeFillet(0.2, halftorus.Edges)
Additional InformationOS: "PCLinuxOS"
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.13528 (Git) AppImage
Build type: None
Branch: releases/FreeCAD-0-17
Hash: 5c3f7bf8ec51e2c7187789f7edba71a7aa82a88b
Python version: 2.7.6
Qt version: 4.8.6
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)
FreeCAD Information



2018-08-07 12:01

administrator   ~0011599

@bzipitidoo please test this on 0.18dev as well (there is an appimage). Also please, per our guidelines (yellow banner at the top) post to our forums before opening a ticket.


2018-08-07 13:29

reporter   ~0011601

I tested this script with makeFillet on version 0.18.14220 and 0.18_Conda Appimages. The problem with makeFillet is present in both 0.18 versions.


2018-08-07 15:36

administrator   ~0011602

please open a forum thread and post this ticket to it to start a discussion. thanks


2018-09-02 21:47

manager   ~0011692

For the Python challenged, an actual FreeCAD document would be nice. I'm an experienced CAD user, I can troubleshoot models, but I need a model to do it - a python script might as well be Mandarin to me. I don't speak Mandarin. And running the aforementioned script produces zero visible result in the 3D view.


2018-10-04 09:14


0003554.FCStd (7,716 bytes)


2018-10-04 09:15

administrator   ~0011915

Attached is a project file with the half torus. Now go to Part, select the fillet tool and select all edges. Use a radius of 0.2.


2018-11-07 00:51

administrator   ~0012143

Forum thread:


2018-11-11 05:37

manager   ~0012170

Last edited: 2018-11-11 05:38

The problem seems to be with the inner circular edge of the half torus. Without it, all other edges fillet successfully.

A workaround is to cut the torus slightly bigger or smaller than half. If the minor radius of the torus is 4mm, cut 0.001 from the midplane, either side works - all fillets succeed.

I would surmise that this is an OCC issue...

OS: Ubuntu 18.04.1 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.15169 (Git)
Build type: Release
Branch: master
Hash: 7d197ce829600e308dd0e85aeb1a4ac9376ff286
Python version: 2.7.15rc1
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: French/Canada (fr_CA)


2022-03-03 13:55

administrator   ~0016634

This ticket has been migrated to GitHub as issue 5799.

Issue History

Date Modified Username Field Change
2018-08-06 16:50 bzipitidoo New Issue
2018-08-06 16:50 bzipitidoo Tag Attached: Part
2018-08-07 12:01 Kunda1 Status new => feedback
2018-08-07 12:01 Kunda1 Note Added: 0011599
2018-08-07 13:29 bzipitidoo Note Added: 0011601
2018-08-07 13:29 bzipitidoo Status feedback => new
2018-08-07 15:36 Kunda1 Status new => feedback
2018-08-07 15:36 Kunda1 Note Added: 0011602
2018-09-02 21:47 normandc Note Added: 0011692
2018-09-03 10:37 Kunda1 Steps to Reproduce Updated
2018-10-04 09:14 wmayer File Added: 0003554.FCStd
2018-10-04 09:15 wmayer Note Added: 0011915
2018-10-17 20:37 Kunda1 Target Version => 0.18
2018-11-07 00:51 Kunda1 Note Added: 0012143
2018-11-11 05:37 normandc Note Added: 0012170
2018-11-11 05:37 normandc Note Edited: 0012170
2018-11-11 05:38 normandc Note Edited: 0012170
2019-01-16 15:02 wmayer Target Version 0.18 => 0.19
2021-02-06 06:50 abdullah Target Version => 0.20