Custom Bracket & Shelf Support Generator for 3D Printing

A bracket built to your dimensions

Brackets are among the simplest and most useful functional parts, but an existing model often fails on one small detail. One leg is too short, the holes are in the wrong position, the angle is different or the entire bracket is larger than necessary.

With the Vuolti Bracket Generator, you define the important dimensions yourself. Set both leg lengths, bracket width, material thickness and the angle between the two faces.

You can also add mounting holes to either leg and reinforce the bracket with gussets. This makes the generator useful for basic L-brackets as well as custom shelf supports and structural mounting parts.

What you can customize

Set the overall bracket length or width
Adjust leg A length
Adjust leg B independently
Set material thickness
Change the angle between both legs
Add holes to leg A
Add holes to leg B
Position mounting holes for your project
Add countersinks for screw heads
Add counterbores for other screw-head styles
Create slots for adjustable mounting
Add reinforcement gussets
Account for your printer build volume
Estimate material usage before downloading
Switch between simple and advanced configuration modes

What can you use a custom bracket for?

A parametric bracket can be used in many functional projects where two surfaces need to be connected or supported at a defined angle.

Shelf supports
Small wall shelves
L-brackets for furniture projects
Angle connectors for wood and plastic parts
Workshop and hobby mounts
Supports for lightweight structures
Plate mounting brackets
Electronics and enclosure projects
Spacers and assembly aids
Custom repair parts
Made-to-fit brackets for physical products

Every value in detail

Every value in the generator and what it does. Open the one you are about to change.

Start quickly in Simple Mode

Many projects only need a few core parameters. In simple mode, you can quickly define the main dimensions: bracket width or length, both leg lengths, thickness and angle.

That is already enough to create a custom L-bracket without configuring every advanced detail.

If the project needs mounting holes or reinforcement, additional options can then be added.

Set both leg lengths independently

One major advantage over a downloaded bracket is that both legs can be sized independently.

Leg A might be short and serve only as a wall mounting face, while leg B extends much farther to support a shelf. In another project, the opposite geometry may be more useful.

This lets you fit the bracket to the actual available space and intended function.

Choose bracket width for your project

Bracket width affects contact area, available room for mounting holes and material consumption.

A narrow bracket saves filament and can work for small lightweight projects. A wider bracket provides more room for fasteners and can distribute forces across a larger area.

Width alone does not define load capacity. Material, print orientation, layer adhesion, thickness, reinforcement and mounting all matter as well.

Control material thickness

Leg thickness is one of the most important parameters in a functional bracket.

A thicker part uses more material but may provide greater robustness depending on geometry and print direction. Lighter applications may work with less material.

The appropriate thickness depends on bracket size, expected load, filament and print orientation.

Go beyond 90 degrees

A traditional L-bracket uses a 90-degree angle, but not every project needs a right angle.

The adjustable angle lets you generate supports for sloped surfaces and non-standard constructions.

This is useful when two parts do not meet at 90 degrees or when a shelf or panel needs to be installed at a deliberate angle.

Add mounting holes to either leg

Mounting holes can be added to both sides of the bracket.

For example, leg A can be fixed to a wall while leg B attaches to a shelf or another component.

Hole placement can be configured around the actual installation instead of forcing an existing screw pattern to fit a downloaded model.

Recess screw heads where needed

Depending on the screw type, it can be useful to recess the screw head into the bracket.

The generator supports features such as countersinks for countersunk screws and cylindrical counterbores for other screw-head types.

This allows the screw head to sit more flush or deeper within the part, provided the selected material thickness leaves enough room.

Measure the actual screw-head diameter and height before printing.

Use slots for mounting adjustment

Slots are useful when the bracket needs some adjustment after it is positioned.

Unlike a round hole, a slot provides movement in one direction. This can help with imperfect existing hole positions or installations where the final position is determined during assembly.

Leave sufficient material around slots, especially in loaded applications.

Reinforce the bracket with gussets

Reinforcement ribs or gussets can be added between the two bracket legs.

These structures support the transition between both faces and can significantly increase stiffness.

They are particularly useful on shelf supports or brackets with longer legs, where the inside corner may experience high mechanical stress.

Larger or additional gussets increase both strength potential and material usage, so the ideal configuration depends on the project.

How to plan your bracket

Start by measuring the two surfaces or components that need to be connected or supported.

Determine the required length of leg A and leg B and how much bracket width is available for contact area and screws.

If screws or existing holes are already present, measure their diameter and position carefully. Countersinks and counterbores also require the dimensions of the actual screw head.

For loaded applications, leave sufficient material between holes, outer edges and the inside corner.

Measure both required leg lengths separately
Determine available bracket width
Check the actual angle between the parts
Measure screw and screw-head diameter
Transfer existing hole positions accurately
Leave enough material around every hole
Allow extra edge distance around slots
Reserve space for reinforcement gussets

Examples of custom brackets

01

Small L-bracket

Create a compact 90-degree bracket with two short legs for lightweight mounting or repair tasks.

02

Shelf support

Use a longer horizontal leg, suitable wall-mounting holes and reinforcement gussets to create a custom shelf bracket.

03

Furniture connector

Match both leg lengths and hole positions to existing panels or wood parts for a specific furniture project.

04

Bracket with adjustment slot

Use a slot when some positioning freedom is needed during installation.

05

Non-90-degree bracket

Generate a bracket with a custom angle when two parts need to meet at a deliberate slope.

06

Reinforced support bracket

Combine greater thickness with one or more gussets when a stiffer support is required.

07

Multiple variants for personal use

For your own private projects, you can create brackets in different sizes, angles and mounting configurations.

How the Bracket Generator works

Choose simple or advanced mode.
Set bracket width or overall length.
Adjust leg A and leg B lengths.
Set material thickness.
Define the required angle.
Add holes to leg A if needed.
Add holes to leg B if needed.
Configure screw-head recesses or slots.
Add gussets for additional reinforcement where appropriate.
Check the model in the 3D preview.
Review build volume and estimated material usage.
Generate the STL and prepare it in your slicer.

Create a bracket

No CAD required

A simple L-bracket is a common beginner CAD model. Once you need different leg lengths, a custom angle, individually positioned holes, countersinks, slots and reinforcement, however, the modeling work becomes much more involved.

Vuolti handles these repeatable design tasks. You focus on the dimensions and functions that matter for your project.

CAD is still useful for complex engineered parts. For a made-to-fit bracket, a parametric generator is often the faster route.

Why not just scale an existing L-bracket STL?

Scaling a finished STL changes every dimension together.

If you only need one longer leg, standard scaling also changes the other leg, thickness and mounting holes.

A screw hole also becomes larger or smaller even though your screw remains the same size.

With a parametric generator, you can change only the leg length, width, angle or hole positions you actually need while keeping unrelated dimensions unchanged.

3D printing tips for brackets

Brackets are functional parts and may experience significant mechanical loads. Print orientation, material, wall thickness and layer bonding can therefore be critical.

Fully test the bracket before regular use
Choose material based on load and temperature
Consider tensile and bending forces when selecting print orientation
Use sufficient wall count in loaded areas
Check holes and screw-head recesses before mounting
Consider gussets for higher loads
Remember that longer legs create greater leverage
Choose screws and mounting hardware appropriate for the substrate
do not use untested printed parts for safety-critical applications

Will the bracket fit your 3D printer?

Large shelf supports and long brackets can quickly approach the limits of a printer build volume.

The generator can take your available build space into account so you can identify oversized configurations before exporting.

If the bracket becomes too large, leg lengths or width can be adjusted accordingly.

Estimate filament use before printing

The generator can estimate model volume and approximate filament usage.

This is particularly useful when comparing variants. Greater thickness, wider legs and additional gussets can substantially increase material use.

The estimate helps identify unnecessarily massive designs before export.

Load and safety

Bracket dimensions alone do not determine load capacity.

Material, print temperature, layer adhesion, infill, wall count, print orientation, screws, substrate and load direction all have a major effect on strength.

Vuolti therefore does not provide a guaranteed load rating for generated brackets. Do not use 3D printed brackets without testing them for people, heavy safety-critical objects or applications where failure could cause injury or significant damage.

Test every configuration under controlled conditions.

Why use Vuolti instead of downloading a ready-made STL?

A bracket looks like a very simple part, but several dimensions often need to match at the same time: both leg lengths, width, thickness, angle, hole positions and screw-head geometry.

A ready-made STL therefore often only partially fits.

Vuolti reverses the process. Instead of searching for a bracket that is close enough, you enter the relevant dimensions and generate your own model.

That is especially useful for repairs, furniture projects and existing screw patterns.

Free for private use today

Everything you generate with Vuolti today is free to use for private, non-commercial projects.

A solution for commercial use is planned but not available yet. Until then, the current free-use terms apply.

Digital model files may not be published or redistributed.

The current terms of use apply. A commercial-use licence is planned but not yet available.

Free to use · Disclaimer

Frequently asked questions

Can I set both leg lengths independently?

Yes. Leg A and leg B can be sized separately.

Does the bracket have to be 90 degrees?

No. The angle between both legs can be adjusted.

Can I choose the material thickness?

Yes. Bracket thickness is configurable.

Can I add mounting holes to both legs?

Yes. Mounting holes can be added to both leg A and leg B.

Can I create countersinks for screw heads?

Yes. The generator supports features such as countersinks for countersunk screws.

Can I create cylindrical recesses for screw heads?

Yes. Counterbores can also be used for suitable screw-head styles.

Can I create slots?

Yes. Slots can be used where installation requires some positional adjustment.

Can I reinforce the bracket?

Yes. Reinforcement ribs or gussets can be added between the bracket legs.

Can I use the generator for shelf brackets?

Yes. Different leg lengths, mounting holes and optional reinforcement make it suitable for custom shelf supports.

Do I need CAD experience?

No. Set the required parameters and Vuolti generates the model.

Can I check whether the bracket fits my printer?

Yes. Your available printer build volume can be considered during configuration.

Does the generator estimate filament use?

Yes. It can display estimated model volume and filament usage.

How much weight can a printed bracket hold?

There is no universal value. Capacity depends on geometry, material, print orientation, print settings, mounting hardware and substrate, so each configuration must be tested.

The configurators

Box Bathroom holder Remote holder Wall mount End cap Cable grommet Tube adapter Bottle holder Handle Hook QR code Fastener strip Phone case Shower shelf Tube holder

Custom Bracket Generator for 3D Printing