Choose a Geometric Stained Glass Pattern You Can Cut

For a first geometric stained-glass project, start with a small flat design whose individual pieces you can clearly identify—not simply an image with straight lines. Check the smallest shapes, the finished dimensions and the joining method before choosing your glass.

Below are three pattern sources, followed by a paper-template task you can finish before cutting. The preparation steps assume copper-foil construction, not lead came.

Three pattern sources worth comparing

The following details reflect the publishers’ listings checked on October 8, 2026; beginner ratings are theirs, not independent cutting tests.

Pattern source	What it offers	What to check before committing
Delphi: Free Geometric Design Pattern	A free printable PDF that Delphi describes as suitable for beginners.	Open the download and check its dimensions, piece shapes and any construction notes. A beginner label does not replace that inspection.
GlassyRock Arts: Geometric Diamond Beginner Pattern	A paid digital pattern with numbered and clean versions. The designer describes straight lines and circles and lists copper-foil materials for assembly.	Choose it if you want some curved cutting as well as straight cuts; it is not an all-straight-line exercise.
Craftsmanspace: Horizontal Geometric Collection	A free collection of 32 horizontal rectangular designs in SVG, EPS and DWG formats.	Better suited to someone comfortable opening vector or CAD files and preparing a full-size working pattern than someone wanting a ready-to-print PDF.

Check permissions separately from price. GlassyRock’s listing includes hobby and commercial licenses, requests designer credit when selling finished work, and prohibits sharing or republishing the pattern. Craftsmanspace lists an Attribution–NonCommercial–ShareAlike license, but its license page distinguishes finished objects from downloadable files and defines commercial use in its own terms. Read the conditions for your intended use rather than assuming “free” means unrestricted.

Which geometry should you choose?

Use these as selection priorities, not fixed difficulty ratings:

• Rectangles and broad bands: a sensible starting point for straight-cut practice. Prefer generous pieces over a border made from very narrow strips.
• Diamonds and triangles: inspect every pointed end at the intended finished size. A striking outline can conceal tiny slivers where diagonals meet.
• Circles and arcs: choose these when curved cutting is part of the practice you want. Inspect the surrounding pieces too—not just the circle itself.
• Repeating grids: look beyond the repeated shape. Check whether the design includes a framing or reinforcement plan.

That last check matters particularly for a freely hanging copper-foil piece. Milly Frances explains that an unsupported straight or nearly straight seam running from one edge to another can form a hinge point, allowing sections to bend. Treat such a layout as needing a structural plan, not merely tidy soldering. See her explanation of unstable suncatchers.

If the pattern relies on framing, settle that before cutting; our guide to stained-glass frames distinguishes an edge finish from reinforcement and retention.

Prepare a copper-foil cutting template

Set out your materials

You need the pattern file, a printer, two identical paper copies, a ruler, pencil or fine pen, regular scissors, copper-foil pattern shears and an envelope for the cut pieces. Keep one copy intact as the assembly map. No glass or soldering equipment is needed for this task.

1. Set the size, then measure the print

Follow any printing instructions supplied with the pattern. If resizing is allowed and no fixed-size components constrain the design, calculate:

Print scale (%) = desired width ÷ original width × 100

For example, changing an 8-inch-wide design to 10 inches requires 125% scaling. Keep width and height proportional; stretching only one direction changes the geometry.

After printing, measure the actual outline. Do not rely on the percentage shown in the print dialog. If the pattern spans several sheets, align its matching marks or lines before taping. Our pattern-reading and resizing guide covers the broader setup.

2. Label both copies before separating anything

Give every piece a unique number on both copies, including repeated shapes. Add a simple color key. If you want streaks or texture to run consistently, draw direction arrows now.

Use the intact copy to inspect the smallest pieces at full size. Circle any shape you want to rehearse on scrap glass later. Reducing a pattern reduces its narrow pieces too, so repeat this check after every size change.

3. Remove the joining allowance

These instructions apply to a continuous line drawing. If the designer supplies separate cutting templates with allowances already removed, follow those instructions instead—do not subtract the allowance twice.

Cut around the outside of the whole design with regular scissors, keeping the intended outline. Use pattern shears for the internal boundaries between pieces, as described in Delphi’s pattern-preparation guide.

For three-bladed pattern shears, place the center blade on the pattern line. The outer blades remove a thin strip between neighboring templates. Use shears intended for copper foil: Delphi’s pattern-cutting instructions explain that foil shears allow for two foil thicknesses, while lead shears remove a wider strip for the heart of the came.

Work slowly, especially at corners. If the waste strip catches, stop cutting and clear it with the blades open and stationary rather than forcing the paper through. Keep fingers clear of the blades. Milly Frances’s template-cutting tutorial also recommends clearing waste strips frequently to prevent jams.

4. Check the templates against the map

Lay each paper piece back over its numbered position. Confirm that no point was accidentally clipped off, every piece is present, and the removed strips leave separation between neighboring templates.

Keep the intact map and template envelope together. Before committing your project glass, use the circled shapes for practice with your glass cutter. The paper preparation is complete when the print measures correctly, every piece is identifiable, and the demanding cuts and support needs are marked for attention.