Tools drawing 3d models
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1,806 tools drawing 3d models found

Download or buy, then render or print from the shops or marketplaces. 3D Models below are suitable not only for printing but also for any computer graphics like CG, VFX, Animation, or even CAD. You can print these 3d models on your favorite 3d printer or render them with your preferred render engine. Please note that the 3D model database is only a Search Engine. You should visit the original websites. Most of the models can be easily imported and rendered with Autodesk 3ds Max, Maya, Blender, C4D, and Sketchup. Check for online 3d model conversions tools for your file format. Shown 1 of 16 pages
turbosquid
$7
Drawing Tool - Pastel

Drawing Tool - Pastel

...g tool - pastel for download as 3ds, lwo, obj, blend, and dae on turbosquid: 3d models for games, architecture, videos. (1150253)
turbosquid
$7
Drawing Tool - Perspective Board

Drawing Tool - Perspective Board

...rspective board for download as 3ds, lwo, obj, blend, and dae on turbosquid: 3d models for games, architecture, videos. (1152414)
turbosquid
$7
Drawing Tool - Poster Color

Drawing Tool - Poster Color

... - poster color for download as 3ds, lwo, obj, blend, and dae on turbosquid: 3d models for games, architecture, videos. (1150878)
turbosquid
$7
Drawing Tool - Marker Color

Drawing Tool - Marker Color

... - marker color for download as 3ds, lwo, obj, blend, and dae on turbosquid: 3d models for games, architecture, videos. (1150869)
turbosquid
$7
Drawing Tool - Colored Pencil

Drawing Tool - Colored Pencil

... colored pencil for download as 3ds, lwo, obj, blend, and dae on turbosquid: 3d models for games, architecture, videos. (1150249)
3d_export
$40
welding tooling drawing of forklift middle portal frame

welding tooling drawing of forklift middle portal frame

... for tooling, can also be used in other machinery. this picture is from the world's top 500 enterprises, designed by germany.
3d_export
$96
welding tooling drawing of forklift outer portal frame in large enterprises

welding tooling drawing of forklift outer portal frame in large enterprises

...is mainly used for welding all kinds of weldable materials, large, medium and small materials. medium and small batch production.
3d_export
$7
teaching using cnc machine tools

teaching using cnc machine tools

...cnc machine tools 3dexport teaching using 3d digital model drawing of cnc machine...
3d_export
$9
Writing drawing 3D Model

Writing drawing 3D Model

...nical pencil write work draw vray marker sharpie school office supplies home pen tool writing drawing 3d model ae3d 5010 3dexport
3d_export
$76
Drawing table 3D Model

Drawing table 3D Model

...3dexport drafting table draft drawing ruler tsquare desk protractor tools parallel bar drawing table 3d model braz 5825...
3d_export
$35
School tools 3D Model

School tools 3D Model

...kids children kid furniture office supplies pen pencil draw drawing ruler crayon penknife school tools 3d model braz 11905...
cg_studio
$9
drawing writing tool3d model

drawing writing tool3d model

...ool3d model cgstudio .3ds .max - drawing writing tool 3d model, royalty free license available, instant download after purchase.
3d_export
$40
Backpack School tools 3D Model

Backpack School tools 3D Model

...kids children kid furniture office supplies pen pencil draw drawing ruler crayon penknife backpack school tools 3d model braz...
3d_export
$76
Drafting table tools 3D Model

Drafting table tools 3D Model

...drafting table tools 3d model 3dexport drafting table draft drawing ruler tsquare desk protractor tools parallel bar drafting table...
3d_export
$9
Drawing Compass 3D Model

Drawing Compass 3D Model

...drawing design art pen pencil circle arc architecture architect tools needle part assembly solidworks inventor stl drawing compass 3d...
3d_export
$8
tool replacement gearbox

tool replacement gearbox

...tool replacement gearbox 3dexport eccentric lifting mechanism, you can process according to available drawings.
3d_export
$26
Goniometer 3D Model

Goniometer 3D Model

...goniometer 3d model 3dexport goniometer angle measure drawing tool goniometer 3d model tartino 65342 3dexport
3d_export
$26
Compass 3D Model

Compass 3D Model

...compass 3d model 3dexport compass drawing tools architect drafting divider compass 3d model tartino 65329...
3d_export
$15
Brush 3D Model

Brush 3D Model

...brush 3d model 3dexport brush paint color colors paints drawing painting art tool acrylic brush 3d model bodya 11574 3dexport
3d_export
$15
Coloured Pencils 3D Model

Coloured Pencils 3D Model

...office color pencils pencil kindergarten crayon toy crayons tool tools school art supplies colored supply kids rainbow colors colour...
3d_export
$10
automobile hardware mold complete set of production cad drawing

automobile hardware mold complete set of production cad drawing

...industrial production, with a variety of presses and special tools installed on the press, through the pressure of metal...
3d_export
$29
Tsquare 3D Model

Tsquare 3D Model

...uare square tsquare technical drawing instrument draftsmen straight edge measuring tool tsquare 3d model plutonius 34934 3dexport
cg_studio
$100
Pen Holder3d model

Pen Holder3d model

...ng write plastic acrylic red shelves .max - pen holder 3d model, royalty free license available, instant download after purchase.
3d_export
$140
drafting table 3D Model

drafting table 3D Model

...3dexport drafting table draft drawing ruler tsquare desk protractor tools parallel bar drafting table 3d model braz 5821...
3d_export
$28
Pencil Sharpener 3D Model

Pencil Sharpener 3D Model

...ort pencil sharpener pen office supplies desk drawing drafting tool school work pencil sharpener 3d model plutonius 7560 3dexport
cg_studio
$20
12 Coloured Pencils3d model

12 Coloured Pencils3d model

...office color pencils pencil kindergarten crayon toy crayons tool tools school art supplies colored supply kids rainbow colors colour...
3d_export
$15
Marker 3D Model

Marker 3D Model

...ing household office blanc paper write draw work book resaltador marcador marcadores desk marker 3d model gldesign 25512 3dexport
3d_export
$10
Double Pencil Sharpener 3D Model

Double Pencil Sharpener 3D Model

... pen office supplies desk drawing drafting tool school work vray double double pencil sharpener 3d model trinity23 30686 3dexport
3d_export
$35
Beam Compass 3D Model

Beam Compass 3D Model

... radius diameter circumference architect draftsman tool texture material photoreal beam compass 3d model plutonius 35093 3dexport
3d_ocean
$15
The Professor

The Professor

...point turn - 3 expression of body - topology, tools and description...
3d_export
$15
Painter Easel 3D Model

Painter Easel 3D Model

...stand painting display wooden frame paint station drawing darkroom tools easels instrument creativity canvas painter easel 3d model firdz3d...
cg_studio
$29
T-square3d model

T-square3d model

...ght edge measuring tool .3ds .max .obj .wrl - t-square 3d model, royalty free license available, instant download after purchase.
3d_export
$5
model drawing of manual lathe

model drawing of manual lathe

...el, including spindle structure, tool holder structure, tail top structure, clearly showing screw rod and guide rail transmission
3d_ocean
$18
Compass

Compass

...circles compass drawing mechanics metal parts plans plastic projects tools wallpaper a high poly model of a compass.render settings,...
3d_export
$7
automatic assembly dispensing line

automatic assembly dispensing line

...e drawings is very good. after downloading, there won't be few parts or can't be opened. you can rest assured to download
3d_export
$206
WG 1016 - Landscape rakes 100 - 250 cm

WG 1016 - Landscape rakes 100 - 250 cm

...cm 3dexport line of landscape rakes are the perfect tools for removing debris or giving an area that “groomed...
3d_export
$50
3d engineering drawing of cup mask production line list bom

3d engineering drawing of cup mask production line list bom

...is easily qualified <br>3. servo shift, accurate positioning, imported tools cutting edges and oily <br>4. integrated manufacturing of several...
3d_export
$169
cnc lifting table turret drilling tapping 850 machine tool

cnc lifting table turret drilling tapping 850 machine tool

...s in the turret tool changing state, the power is transferred to the turret mechanism to push the turret and replace the spindle.
3d_export
$338
WG 0018 - Attachment carrier x1

WG 0018 - Attachment carrier x1

...graphy: *.stl<br>all cad drawings are saved in format *.pdf<br>programs for plasma (laser) saved in the format: *.dxf
3d_export
$240
WG 1015 - Rear mounted blade 100 - 250 cm

WG 1015 - Rear mounted blade 100 - 250 cm

...blade 100 - 250 cm 3dexport if you need tools for landscaping, snow removal, forage work, digging a pit,...
3d_export
$12
jewelry tool- imm curve brush- gems and cutters for zbrush v2

jewelry tool- imm curve brush- gems and cutters for zbrush v2

...ion and boolean, and fully compatible with zbrush's imm curve mode. files included: -zbrush zbr -zbrush ztl -obj of all parts
3d_export
$7
three storey villa 3-17

three storey villa 3-17

...and sleeping, simple and generous appearance, bright color, appropriate room scale design and space the utilization rate is high.
3d_export
$10
WG 0001 - grassland roller

WG 0001 - grassland roller

...ks: *.sldprt *.slddrw *.sldasm (native)<br>iges: *.iges *.igs<br>step: *.step *.stp<br>stereolithography: *.stl
3d_export
$7
three storey villa 3-10

three storey villa 3-10

...us appearance, bright color, appropriate room scale design and space the utilization rate is high.<br>reference cost 156000
3d_export
$5
Chicken Fantasy

Chicken Fantasy

...each voxel to form stylized images. the main modeling tools like blender and maya have filters and plugins for...
3d_export
$40
cup type mask machine n95 bowl type mask machine

cup type mask machine n95 bowl type mask machine

...filtering function 3. servo shift, accurate positioning, imported cutting tools cutting edge oil slippery 4. integrated manufacturing of several...
3d_export
$7
three storey villa 3-11

three storey villa 3-11

..., easy to use, simple architectural modeling, smooth lines, economical and applicable.<br>the reference cost is 230000 yuan
3d_export
$14
cutter potato slicerfrench fry cutter vegetable potato slicer cutter chip maker tool cutting machine

cutter potato slicerfrench fry cutter vegetable potato slicer cutter chip maker tool cutting machine

...ervice quantities in less time. whether manual or electric powered, all commercial french fry cutters perform in one of two ways.
3d_export
free
WHO USES AUTOCAD AND WHY IS IT IMPORTANT

WHO USES AUTOCAD AND WHY IS IT IMPORTANT

...engineers, use it extensively to construct everything from straightforward tools to complicated house shuttles. style prototypes, custom tools, and...
3d_export
$9
Screwdriver Drill

Screwdriver Drill

...ces for mobile applications: app interface localization. accompanying text localization (descriptions, manuals, references etc.).
3d_export
$782
WG 0001 - Rollers 600cm 5 in 1

WG 0001 - Rollers 600cm 5 in 1

... in format *.pdf<br>programs for plasma (laser) saved in the format: *.dxf<br>bill of material in the format: *.xlsx.
3d_export
$23
Chainsaw Circular Saw

Chainsaw Circular Saw

...lications:<br>app interface localization.<br>accompanying text localization (descriptions, manuals, references etc.).
3d_export
$10
Drill

Drill

...lications:<br>app interface localization.<br>accompanying text localization (descriptions, manuals, references etc.).
3d_export
$10
Car Tires

Car Tires

...lications:<br>app interface localization.<br>accompanying text localization (descriptions, manuals, references etc.).
3d_export
$6
Riveter

Riveter

...lications:<br>app interface localization.<br>accompanying text localization (descriptions, manuals, references etc.).
3d_export
$22
Cartridge 9x18 mm PM-9 PPT gzh1

Cartridge 9x18 mm PM-9 PPT gzh1

...textures pbr - .jpg ) - exported from gltf tools visual studio code.<br>- .unitypackage (triangulated, mesh + textures -...
3d_export
$22
Cartridge 9x18 mm - PMM

Cartridge 9x18 mm - PMM

...textures pbr - .jpg ) - exported from gltf tools visual studio code.<br>- .unitypackage (triangulated, mesh + textures -...
3d_export
$22
Cartridge 9x18 mm PM-9 P gzh

Cartridge 9x18 mm PM-9 P gzh

...textures pbr - .jpg ) - exported from gltf tools visual studio code.<br>- .unitypackage (triangulated, mesh + textures -...
3d_export
$22
Cartridge 9x18 mm PM - 9 Pst gzh

Cartridge 9x18 mm PM - 9 Pst gzh

...textures pbr - .jpg ) - exported from gltf tools visual studio code.<br>- .unitypackage (triangulated, mesh + textures -...
thingiverse
free
Multi Tool Drawing by

Multi Tool Drawing by

...iverse inspired by kickstarter, this is a useful tool for drawing made ã‚â‹with laser cutting. ita version: paso's making
thingiverse
free
Cube Drawing Tool by justin1910

Cube Drawing Tool by justin1910

...cube drawing tool by justin1910 thingiverse a simple tool for drawing 2d isometric cubes
thingiverse
free
tool draw tray by seanmanagh

tool draw tray by seanmanagh

...tool draw tray by seanmanagh thingiverse tool tray
thingiverse
free
Tool Draw Organisers by A513055

Tool Draw Organisers by A513055

...giverse items to help organise a measuring and marking tool draw. as seen on youtube.https://www.youtube.com/watch?v=oifr6z3a2qm
thingiverse
free
tool for drawing graphs by G4ZO

tool for drawing graphs by G4ZO

...tool for drawing graphs by g4zo thingiverse .
thingiverse
free
Drawing Tools Organizer by salz1

Drawing Tools Organizer by salz1

...drawing tools organizer by salz1 thingiverse basic organizer for drawing pencils, erasers, and straight-edges
thingiverse
free
circle drawing tool ø2.5 - 10mm by joranvogels

circle drawing tool ø2.5 - 10mm by joranvogels

...circle drawing tool ø2.5 - 10mm by joranvogels thingiverse a circle drawing tool to help draw circles
thingiverse
free
Stars drawing tool by samyp

Stars drawing tool by samyp

...erse stars drawing tool. first layer : 0.2 mm other layers : 0.15 mm total : 0.65 mm the red one on the photo is printed in abs.
thingiverse
free
Compass drawing tool by pebber

Compass drawing tool by pebber

...compass drawing tool by pebber thingiverse compass for ikea pen and screws
thingiverse
free
Drawing tools (30º and 45º) by nepturio

Drawing tools (30º and 45º) by nepturio

...s (30º and 45º) by nepturio thingiverse some of my drawing tools :) 3d printed in my creality cr-7 using cura order a 3d print
thingiverse
free
Three-Phase Wave Drawing Tool by RTDesigns

Three-Phase Wave Drawing Tool by RTDesigns

... too aid when you have to draw a three-phase wave form. just print it and use the two align gaps to align it with the base line.
thingiverse
free
Plier trays for tool draws by A513055

Plier trays for tool draws by A513055

...o. if you need further customisation, i show you how to design your own in this video.https://www.youtube.com/watch?v=mocnbftsmfc
thingiverse
free
Tool draw organisation trays by A513055

Tool draw organisation trays by A513055

... draws, but feel free to use them elsewhere if you need a handy container or six. see the video here https://youtu.be/gdvxixtgzgm
thingiverse
free
Tool Draw Organisation by paplin76

Tool Draw Organisation by paplin76

...rements, so all boxes are variations on this (single, double and quad). 1.6mm base and walls, so its sturdy, but slow to print...
thingiverse
free
Drawing Pin insertion tool by RjB

Drawing Pin insertion tool by RjB

...lay to hold the pin in place and then grip the tool in your fist, push the pin in place with your thumb on the rounded thumb pad!
thingiverse
free
Auszugslängenmesser - Draw lengh measure tool by PeterS1

Auszugslängenmesser - Draw lengh measure tool by PeterS1

...eitere durchmesser kommen noch...) tool for measuring the draw length - for arrow diameter 7.2 mm (more diameters still come ...)
thingiverse
free
tool draw (underneath troxny xy-2 pro ) by peter54321

tool draw (underneath troxny xy-2 pro ) by peter54321

...to keep screws,files,nuts and bolts and any other small tools you may...
thingiverse
free
Leather Draw Gauge Tool by jmf60

Leather Draw Gauge Tool by jmf60

...dard utility type razor blade. only other parts needed besides the razor are two 1/4 x 20 x 1 thumb screws and two 1/4 x 20 nuts.
thingiverse
free
Proportional Divider (drawing tool) by 4lienv4mpire

Proportional Divider (drawing tool) by 4lienv4mpire

...pports. make sure the flat side is down on the arms. if you are struggling with proportions in your art this is the tool for you.
thingiverse
free
Parallel Drawing Tool by SdeweT

Parallel Drawing Tool by SdeweT

...t) voneinander entfernt. desweiteren können lininen im rechten winkel zur kante sowie positionen für löcher eingezeichnet werden.
thingiverse
free
The Ultimate Drawing protractor/ruler Tool by Defauld

The Ultimate Drawing protractor/ruler Tool by Defauld

...is 70 degree ;) cause 60 degree would result in a 7 corner..... 90 degree angle = 105 degree 180 degree angle = 210 degree enjoy!
thingiverse
free
Draw/mark & Drill Hole tool for 2020 2040 profile by Amtech

Draw/mark & Drill Hole tool for 2020 2040 profile by Amtech

...r starthole so you can use any other size added! draw helper for marking with any under 2mm pensil for wood, aluminium, steel etc
thingiverse
free
The Grid - bridging,-test /angle,-test / artistic drawing tool by Defauld

The Grid - bridging,-test /angle,-test / artistic drawing tool by Defauld

...perspective, or use it to test your bridging and angles. 5 sides to try. good luck. i would love to see the artistic results ^^
thingiverse
free
The grid 2(xl version) - artistic drawing tool(perspective)/ angling/bridging test by Defauld

The grid 2(xl version) - artistic drawing tool(perspective)/ angling/bridging test by Defauld

...s that you could try as bottom plane. it will show you if your settings are correct and you could use it to improve the settings.
thingiverse
free
Parallel Line Drawing Tool (Parametric) by CodeCreations

Parallel Line Drawing Tool (Parametric) by CodeCreations

... -- and if you hold the pens at the cap, you'll never forget to recap them because they won't stay held if you don't.
thingiverse
free
OmniPost Tool Blocks by Steamboat_Ed

OmniPost Tool Blocks by Steamboat_Ed

...omnipost tool blocks by steamboat_ed thingiverse these are drawings of the kinds of tooling that can be mounted on an omnipost.
thingiverse
free
Compasso disegno/falegname - Compass drawing tool pencil/caliper by m_gadaleta

Compasso disegno/falegname - Compass drawing tool pencil/caliper by m_gadaleta

...1 barra filettata da 6mm 4 dadi da 6mm (oppure dadi a farfalla) 6 bulloncini (diametro 3mm) 1 grosso chiodo (diametro da 2.5 mm)
thingiverse
free
Sine Tool by NebulaStork

Sine Tool by NebulaStork

...sine tool by nebulastork thingiverse this is a simple tool that will draw out a sine wave as you roll it across paper.
thingiverse
free
bullseye by Tricerataco

bullseye by Tricerataco

...bullseye by tricerataco thingiverse tool used to draw 7" centre ring
thingiverse
free
File Tray by A513055

File Tray by A513055

...by a513055 thingiverse for holding small files or other tools in a tool draw. see it on...
thingiverse
free
Gauge 60mmX150mm / Messlehre / Drawing / Wood

Gauge 60mmX150mm / Messlehre / Drawing / Wood

...gauge 60mmx150mm / messlehre / drawing / wood thingiverse one tool more :-) have fun!!
thingiverse
free
Punch tray by A513055

Punch tray by A513055

...punch tray by a513055 thingiverse a tool draw organiser for hole, centre and nail punches.
thingiverse
free
seam_allowance by Alluklappleiter

seam_allowance by Alluklappleiter

...seam_allowance by alluklappleiter thingiverse this is a simple tool to draw a 7mm or 10mm seam allowance to your pattern.
thingiverse
free
Wiha tools table stand by floville

Wiha tools table stand by floville

...tool holder such as a tools table stand. i drawing legs for a table stand and use this tool...
thingiverse
free
Pen Holder by wiggy

Pen Holder by wiggy

...thingiverse you can print this and hold some drawing tools and pens or...
thingiverse
free
Dashed line Ruler by ZackThing

Dashed line Ruler by ZackThing

...dashed line ruler by zackthing thingiverse simple tool for drawing perfectly straight and even dashed lines.
thingiverse
free
2D Drawing 3D printed by Baldaufa

2D Drawing 3D printed by Baldaufa

...nd 2d to 3d stl file created. cleaned up with the erase tool. upload to tinkercad for details and final stl file sent to printer.
thingiverse
free
Hallway and room tools for tabletop RPG by FosDoNuT

Hallway and room tools for tabletop RPG by FosDoNuT

... rpg by fosdonut thingiverse a tool to hold expo markers to draw 5 and 10 foot hallways or rooms up to 40 foot on a 1 inch grid.
thingiverse
free
Centre Finder

Centre Finder

...ject (up to 40mm diameter) accurately, place on the round object, draw a line then draw another at 90 degrees to find the centre.
thingiverse
free
Math Right Angle Tool by Igoroxa

Math Right Angle Tool by Igoroxa

... rather use a protractor to draw or check a right angle or would you rather use this tiny gadget to measure or draw right angles.
thingiverse
free
center liner by QA3Design

center liner by QA3Design

...nter liner by qa3design thingiverse with this tool you can easily draw the centerline on a shelf. supports thickness up to 30mm.
thingiverse
free
Cards lettering guide / normographe by jnaulet

Cards lettering guide / normographe by jnaulet

...ring guide / normographe by jnaulet thingiverse this is a small tool to draw cards easily on my folio. not perfect but it works.
thingiverse
free
10cm straight-edge, and curve. by triotip

10cm straight-edge, and curve. by triotip

...10cm straight-edge, and curve. by triotip thingiverse a simple drawing tool featuring 2 10cm straight edges, and a curve.
thingiverse
free
Interior And Exterior Angle measuring tool by HenriDIY

Interior And Exterior Angle measuring tool by HenriDIY

...d for drawing. including a 27 cm ruler and a friction lock. i suggest using marker or paint to color lines for better visibility.
thingiverse
free
Anet A8 Simple Tool Organizer by Davidone1983

Anet A8 Simple Tool Organizer by Davidone1983

...was looking for something able to hold all anet tools together. i decided to draw and print by myself...
thingiverse
free
Columbia CA025 E15 Watch Backplate Tool

Columbia CA025 E15 Watch Backplate Tool

...tool compatible with the columbia ca025 e15 watch and possibly others might upload pictures and a technical drawing at some point
thingiverse
free
Draw your Learning: Makerbot Printshop Tutorial by ryan74

Draw your Learning: Makerbot Printshop Tutorial by ryan74

...print, and interact with their learning. however, most cad tools take multiple class sessions to complete a design and...
thingiverse
free
File trays by A513055

File trays by A513055

...se a variety of trays for storing files and rasps in a tool draw. see the video here : https://www.thingiverse.com/thing:4840106
thingiverse
free
Grid drawing method for kids by AvinashPudale

Grid drawing method for kids by AvinashPudale

...cardboard version and instructable guide herehttps://www.instructables.com/id/grid-drawing-method-screen-using-3d-printing-and-c/
thingiverse
free
Corner fillet radius finder - 1-10 mm by Rlangas

Corner fillet radius finder - 1-10 mm by Rlangas

...s finder - 1-10 mm by rlangas thingiverse a handy tool for helping with finding the fillet radius on parts you are drawing in 3d
thingiverse
free
Pen/Brush/Tool Tray Customizer by ccox

Pen/Brush/Tool Tray Customizer by ccox

...doesn't seem to be working lately. brushes, pens, and tools not included ;-)...
sketchfab
$4
Draw Knife Low Poly PBR

Draw Knife Low Poly PBR

...ae obj usdz gltf usdz has also embedded material with textures - draw knife low poly pbr - buy royalty free 3d model by funfant
thingiverse
free
Keychain with maze by smartly21

Keychain with maze by smartly21

...with maze by smartly21 thingiverse creating keychain with drawing tools in selfcad more selfcad guides you can see...
thingiverse
free
Spagetti Scale by zBis

Spagetti Scale by zBis

...ttle object is a tool to measure pasta. leftovers are over ! an example we often use for our 2d drawing workshops as an exercise.
thingiverse
free
led cube, guide to fold leds by Gnieark

led cube, guide to fold leds by Gnieark

...to fold leds by gnieark thingiverse to fold identicaly all the leds' anodes and cathods for my led cube, i drawed this tool
thingiverse
free
prym chalk cartridge holder

prym chalk cartridge holder

...older thingiverse tool to hold two prym chalk cartridges in a certain distance. so you can draw two parallel lines on a textile.
thingiverse
free
Trammel of Archimedes by HSB

Trammel of Archimedes by HSB

...make sure the slides rotate freely. the brackets is clamped to the scale ruler using m4 machine screws after threading the holes.
thingiverse
free
Center Scribe Tools by ckasper

Center Scribe Tools by ckasper

...ite plastic cylinders in constant contact with the sides of the object. this keeps the pencil centered between them at all times.
thingiverse
free
Serious Centre Finder by J-Max

Serious Centre Finder by J-Max

...ence corners are heavy duty. the tool have a beweled marking edge to allow a very precise drawing line. it's a lifetime tool.
thingiverse
free
Centerfinder by Bastien

Centerfinder by Bastien

... than turn it about 90 degrees and draw another line. there you go! you should have a cross at the precise middle of your object.
thingiverse
free
eggbot - butterfly by FautzMakes

eggbot - butterfly by FautzMakes

...ps://github.com/fablabnbg/inkscape-centerline-trace). the resulting drawing then was streched and warped to nicely print on eggs.
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