A 3D-printed fractal vise can grip many irregular objects that would slide, rock, or require improvised packing in a conventional flat-jaw vise. Its nested jaw segments pivot independently, distributing contact around curved, tapered, and uneven surfaces.
There is no single definitive fractal-vise STL. The best-known printable designs make different compromises between printability, purchased hardware, rigidity, width, and accessories. For most makers, Teaching Tech is the practical starting point; ToMaTo Lab is the most hardware-saving experiment; and Borge V2 is the choice when stiffness and built-in accessories matter.
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What is a fractal vise?
A fractal vise replaces two broad, flat jaws with nested sets of smaller jaw segments. As the main jaws close, the smaller segments pivot independently until they meet the workpiece. The result is a clamp that can approximate a concave, convex, tapered, or otherwise uneven surface through multiple contact points.
The word fractal is descriptive rather than a claim that the tool is mathematically fractal. The visual and mechanical idea is repeated subdivision: a large jaw contains smaller jaw sets, which contain still smaller contact surfaces. The metal mechanism is associated with a vise patented in 1913; the mechanism described by Make: uses 30 semicircular jaw components connected through dovetail-like joints.
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In simplified operation:
- The nested jaws are open.
- An irregular object is placed between them.
- The main jaws move inward.
- Each nested segment rotates to follow the object’s contour.
- Several contact points share the holding load.
This is different from a conventional vise, whose flat faces usually contact only the highest points of an uneven object. A fractal vise can improve contact without requiring a custom set of wooden wedges or soft packing. It does not, however, eliminate the need for a stable fixture, sensible clamping force, or a safety assessment.
Is a 3D-printed fractal vise useful?
Yes—provided it is treated as an adaptable, light-duty fixture rather than a plastic replacement for a steel machinist’s vise.
Typical useful jobs include:
- Holding knife components and knife handles during fitting or finishing.
- Keeping model parts still while painting, gluing, or assembling.
- Holding oddly shaped rocks for light engraving.
- Gripping coins, Zippo-style lighters, and other small objects.
- Supporting objects that are difficult to hold because of limited hand mobility or a disability.
- Holding irregular timber during carefully controlled, light CNC work.
Make: documented one printed vise holding an unusually shaped piece of timber while a 3018-style CNC machine performed facing operations for a tic-tac-toe board, with a satisfactory result. That is a specific demonstration—not a published load rating, universal CNC approval, or safety certification. Cutter forces, vibration, workpiece weight, print quality, and the machine setup can produce very different results.
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A fractal vise is a good fit for gluing, painting, modelmaking, light filing, hand engraving, and delicate assembly. It may be suitable for light routing or milling in soft material when the setup is conservative and independently restrained. It is a poor choice for heavy milling, impact work, high-force drilling, or grinding where a failed jaw could release a dangerous projectile.
The major printable designs compared
The three versions below are related solutions, not interchangeable parts kits. Read the selected maker’s current documentation and bill of materials before downloading or printing.
| Design | Main priority | Support approach | Purchased hardware | Width and features |
|---|---|---|---|---|
| Teaching Tech | Easy printing and low plastic use | Split jaws are designed to avoid support; other parts still depend on the current files and settings | More than the alternatives, including metal rods and fasteners | Modular width; four modules can be mounted on metal rods; constrained jaw movement |
| ToMaTo Lab | Maximum printed content | Split-jaw approach simplifies printing | Minimal compared with the other designs | Generally fixed in the cited version; printed leadscrews with flattened or rectangular geometry, clips, and friction-based features |
| Borge V2 | Functionality and rigidity | Some single-piece jaw dovetails require support and accurate printing | Threaded rods and other specified hardware | Fixed in the cited design but modifiable; accessory mounts, helping-hands support, lights, support-plate rail, and optional TPU jaws |
Make: reported more than a dozen fractal-vise designs on Thingiverse when its project was published. That count should not be treated as a current catalogue total. File availability, revisions, and licensing can change.
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Teaching Tech
Teaching Tech’s design is the sensible choice when printability and adjustable width matter more than minimizing hardware. Its split jaws are intended to print without support, and modular sections can be arranged on metal rods. This makes it attractive for a calibrated but ordinary printer, for builders who want to alter the width, and for light bench work.
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Teaching Tech fractal vise files
ToMaTo Lab
ToMaTo Lab’s “Fully 3D Printed Fractal Vise (Small)” is aimed at builders who want to purchase as little hardware as possible. Its two leadscrews are geared to one handle, and the unusual printed screw geometry is designed to lie flat during printing. Clips and friction features contribute to the nearly all-printed approach.
This economy comes with more dependence on accurate printed threads, clean moving surfaces, and careful tuning. Printed screws can wear or strip sooner than metal hardware, especially when over-tightened. It is best regarded as a light-duty, experimental build rather than the default choice for demanding work.
Borge V2
Borge V2 prioritizes a stiffer, more feature-rich tool. Threaded rods running through the print compress and reinforce the structure, while thicker, shorter jaw sections are intended to reduce sag. The design also provides mounting possibilities for lights, magnifiers, helping hands, backlight-related parts, and support plates. An optional TPU smallest-jaw set can add compliance and protect delicate objects.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchIt is a less forgiving print. Some single-piece jaw dovetails need support, and the mating surfaces demand good dimensional accuracy. The cited version is fixed-width, although the design can be modified. Confirm that the current files and revision are available before committing to the build.
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Borge V2 listing identified by Make:
Which version should you print?
- Choose Teaching Tech if you want the easiest path to a usable build, adjustable width, split jaws, and you are willing to buy rods and fasteners.
- Choose ToMaTo Lab if minimizing purchased parts is the priority and your work is light-duty enough to justify printed screws and additional tuning.
- Choose Borge V2 if you value rigidity, accessory mounts, support plates, and optional flexible jaws, and your printer can produce accurate supported dovetails.
Do not select by nominal jaw opening alone. Useful capacity depends on the complete jaw envelope, the object’s shape, and how much engagement remains after the object is inserted. A highly tapered or smooth object can climb or eject upward. A small object can also be unstable if only one or two jaw tips touch it.
What parts and hardware do you need?
Exact requirements vary by designer and revision. Do not combine the parts list from one project with the STL files, rods, or fasteners from another unless the maker confirms compatibility.
Printed components may include
- A main vise body or four modular bases.
- Nested jaw segments and jaw carriers.
- Split jaw halves or single-piece jaw sections.
- A handle.
- Leadscrews or printed screw components.
- Clips, retainers, and spacers.
- Accessory mounts, support plates, or backlight-related parts.
- Optional TPU jaw inserts.
Purchased components may include
- Threaded rods and smooth guide rods.
- Nuts, washers, bolts, and retaining hardware.
- Bearings, bushings, or spacers where specified.
- Magnets, lights, or helping-hands hardware for accessory versions.
- Rubber, leather, or other removable jaw pads.
The project page lists the 2023 build as moderate difficulty, taking more than 16 hours, with an estimated price of $0–$50 at that time. That estimate is historical and should not be used as a current 2026 project cost.
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Printer, material, and calibration considerations
The files do not establish one universal nozzle, layer height, infill, wall count, orientation, or filament brand. Follow the selected maker’s instructions where they exist. The governing requirement is consistent dimensional accuracy, especially at dovetails, pivots, threads, and sliding interfaces.
- Calibrate before printing the full set. A single-piece jaw with supported dovetails can be unsuitable for a poorly calibrated or older printer. Make: specifically noted difficulty using such parts on an older i3-B clone.
- Protect the force path. Orient load-bearing parts so clamping force does not rely entirely on weak layer-to-layer adhesion.
- Use a rigid structural material. PLA, PETG, ABS/ASA, or an engineering filament may be appropriate depending on the design, printer, temperature, and environment. Do not assume every design is validated in every material.
- Reserve TPU for inserts unless documentation says otherwise. TPU can conform to delicate surfaces and add friction, but it can creep under sustained load and reduce positional precision.
- Control heat. Plastic can soften near hot work, cutting tools, motors, or prolonged friction.
- Do not over-tighten. Extra handle force can strip printed threads, deform jaws, crack layers, or crush the workpiece.
A reliable printing and assembly workflow
- Select one complete design and revision. Download from the maker’s file page and save the assembly notes and hardware list with the project.
- Print a tolerance test. If none is supplied, print one small jaw interface or module before committing to the entire vise.
- Inspect the first moving parts. Check dovetail engagement, pivot clearance, screw fit, and whether parts bind at any point.
- Print the remaining components consistently. Avoid changing material, cooling, or dimensional settings halfway through the build unless necessary.
- Clean interfaces carefully. Remove elephant’s foot, strings, support residue, brims, and loose fragments. Sand only the interference points; excessive sanding creates backlash.
- Dry-fit before tightening. Assemble the nested jaw sets in the documented order and ensure every segment pivots freely without detaching.
- Install rods, screws, nuts, retainers, and accessories according to the selected design—not a different version’s instructions.
- Cycle the vise empty. Open and close it repeatedly. Look for tight spots, uneven travel, screw skipping, and jaw segments that rotate too far.
- Test with a soft, inexpensive object. Increase force gradually and inspect the printed structure before using a valuable part.
- Add pads or supports where appropriate. TPU, rubber, or thin leather can protect delicate surfaces; a support plate or block underneath can prevent rotation and sag.
Open-source files can be modified, but change one variable at a time. Jaw thickness, rod spacing, screw pitch, segment count, and support geometry all alter the force path and may make the original assembly assumptions invalid.
How to test the finished vise safely
1. Static hand test
Clamp a block with a known flat face. Mark the handle position and apply moderate hand force. Watch for jaw spreading, screw skipping, visible flex, layer cracking, or movement around the rods. If anything shifts or cracks, unload the vise and correct the problem before continuing.
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2. Irregular-object test
Use a non-fragile object with changing contours. Confirm that several jaw segments contact it rather than only the tips. Apply moderate lateral pressure by hand and check whether the object rotates, climbs, or rocks. A compliant pad may improve grip but can also make the setup less repeatable.
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Begin with sanding, filing, gluing, painting, or light engraving. Keep fingers clear of the nested-jaw pinch points. Stop if the workpiece shifts or the jaws visibly deform.
4. Rotary-tool or CNC test
Use exceptional caution. A vise that survives hand work may fail under vibration, cutter engagement, or sudden tool loading. Use conservative forces, guarding, an accessible emergency stop, and secondary support where possible. Never interpret the documented 3018-style CNC demonstration as a general machining rating.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common problems and fixes
Dovetails bind
Common causes include elephant’s foot, support residue, over-extrusion, warping, shrinkage, or mating parts printed with incompatible dimensional settings. Clean the interference surfaces first. If the geometry is fundamentally wrong, reprint the part rather than sanding away the fit and creating excessive looseness.
Jaw segments fall out
Check the assembly order, retaining lips or grub screws, split-jaw fasteners, and dovetail dimensions. Excessive rotation or loose hardware can let segments escape. Reassemble according to the selected design’s retention method.
The vise flexes
Long, thin jaws, weak orientation, loose rods, excessive torque, and jaw-tip loading can all cause flex. Reduce force, use thicker jaw variants, tighten the specified compression rods, add a support plate or block, or choose a stiffer design such as Borge V2.
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The workpiece rotates
Rotation usually means too few contact points, an unstable contact triangle, a smooth or tapered surface, overly soft pads, or an upward-directed force path. Reposition the object, add support underneath, use a thin high-friction pad, or switch to a custom fixture or conventional vise when the geometry cannot be made stable.
Printed screws strip
Over-tightening, rough threads, poor layer adhesion, insufficient engagement, heat, and excessive load are typical causes. Replace printed screw components, use metal threaded hardware if the design permits, improve thread quality, and treat the printed handle as a force limiter—not a torque multiplier.
When a different fixture is better
A fractal vise is valuable because it is adaptable, customizable, and accessible to makers with a 3D printer. It is not the right tool for every job.
- Steel bench vise with soft jaws: better for high clamping force, repetitive work, and general durability.
- Strap clamp or pinch-dog: better for large, fragile, or widely irregular objects.
- Vacuum table: better when the top surface must remain unobstructed and the object can form a suitable seal.
- Custom sacrificial fixture: better when the same unusual object will be held repeatedly.
- Ball-joint or universal vise: better when angular positioning matters more than conforming jaw contact.
- Printed modular fixture: better for a repeatable workpiece with a known shape.
- Helping-hands fixture: better for soldering, gluing, and lightweight assembly than for machining.
Where to get the designs
Start with the maker-maintained listing and check the current revision, assembly notes, bill of materials, license, and comments before printing or redistributing files:
- Teaching Tech fractal vise
- ToMaTo Lab Fully 3D Printed Fractal Vise (Small)
- Borge V2 listing identified by Make:
- Make: project overview
“Open source” does not by itself guarantee that a file is currently maintained, complete, commercially redistributable, or available without revision changes. Verify the individual listing before using files in a product or republishing them.
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