How to Work Out Which English Paper-Piecing Templates Fit Together

Start with the length of the actual joining edge. Paper Pieces specifies that its EPP hexagons are measured along one side, rather than across the centre. A 1-inch regular hexagon therefore has six 1-inch edges. Measuring its overall width and calling that its size would lead you to choose the wrong companion pieces. Paper Pieces: Hexagons

For a direct, whole-edge join, place the two papers beside one another with the proposed seam edges touching. Align one endpoint, then inspect the other. Both endpoints should coincide without bending either paper. Rotate the shapes to check the particular edges your layout needs, especially when a template has unequal sides.

Record a short description for each unidentified shape: its name, each different edge length, and its corner angles. For example, “regular hexagon, six 1-inch edges” is useful; “small hexagon” is insufficient. Keep units consistent when comparing measurements.

A maker’s sizing explanation is particularly helpful when ordering companions. Lina Patchwork explicitly states that its 1-inch 60° diamonds coordinate with its 1-inch hexagons and 1-inch equilateral triangles because the measurement refers to the edge. This supports that particular shape combination; check the specifications when switching to another shape or supplier. Lina Patchwork: 60 Degree Diamonds (6-point)

Use the paper outline as your reference for fit. Fabric extends beyond it and folds around its edges. Paper Pieces distinguishes its hexagon papers from coordinating acrylic cutting templates with seam allowances, so the acrylic’s outside edge may represent a different boundary. Paper Pieces: Hexagons

Place the paper beneath the acrylic and identify which line or boundary corresponds to the paper shape. Check the template’s instructions rather than assuming its outside edge is the finished patch size. If you have only an unidentified acrylic, establish whether it includes an allowance before using it to select matching papers.

Sue Daley’s EPP instructions show the distinction in use: cut the fabric with the acrylic, centre the paper on the fabric, then fold the fabric around the paper. Her assembly instructions join the prepared pieces from corner to corner. The paper corners therefore provide the useful reference points for checking a seam. Sue Daley Designs: English Paper Piecing General Requirements

At a fully enclosed junction in flat patchwork, the angles of the pieces surrounding that point must total 360°. A smaller total leaves an opening; a larger total requires overlap. Mathigon demonstrates this principle for both single-shape and mixed-shape tessellations. Mathigon: Tessellations

Count the angle actually touching the junction. A diamond has sharp and broad corners, so turning the same paper changes its contribution. Paper Pieces explains that six 60° diamond points meet to make a six-point star, while eight 45° points make an eight-point star. Paper Pieces: Diamonds—Beyond the Sparkle

The following checks are useful starting points. They assume matching joining edges and the specified regular shapes; each row describes a local junction, rather than a complete quilt plan.

Pieces meeting at one interior point	Angle calculation	Result
Three regular hexagons	120° + 120° + 120° = 360°	Junction closes
Six equilateral triangles	6 × 60° = 360°	Junction closes
Two regular hexagons and two equilateral triangles	120° + 120° + 60° + 60° = 360°	Junction closes
Two regular octagons and one square	135° + 135° + 90° = 360°	Junction closes

These angle combinations are shown in Mathigon’s tessellation lesson. Apply the full-circle check to enclosed junctions. At the outside of an unfinished block, an open angle may simply be space for the next piece.

If you already have regular hexagons, same-edge-length 60° diamonds and equilateral triangles are documented companions in Lina Patchwork’s range. Start with those exact shapes, then test your intended arrangement. A different diamond angle changes the layout even when its sides have the same length. Lina Patchwork: 60 Degree Diamonds (6-point)

For a diamond-centred design, establish which corner points inward. Six sharp 60° corners fill a centre because 6 × 60° = 360°. Replacing those diamonds with 45° diamonds leaves 6 × 45° = 270°, an opening of 90°. That calculation follows directly from the diamond angles documented by Paper Pieces. It explains why equal-length edges alone cannot preserve the same centre. Paper Pieces: Diamonds—Beyond the Sparkle

Be especially careful with names containing “half.” Lina Patchwork’s diamond-half is a triangle made by dividing a 60° diamond lengthwise; it has a 120° corner and two 30° corners. It is consequently a different shape from an equilateral triangle. Identify the intended edge and angle rather than substituting by name. Lina Patchwork: 120 deg Triangle / Diamond-Half

Use this three-stage paper test. It combines the edge and angle checks into a practical decision sequence; it is a suggested workflow derived from the geometry above.

1. Test one seam. Put the intended paper edges together and confirm that both endpoints align.
2. Complete one junction. Add every shape surrounding the chosen interior point. Check for a gap or overlap and confirm the angle total.
3. Extend the block. Complete the motif, then add enough neighbouring pieces to test every distinct connection around it. Inspect the spaces between motifs as carefully as their centres.

For a worked example, suppose you have six 1-inch 60° diamonds and want a six-point star. First confirm that all joining sides measure 1 inch. Arrange the six sharp points at the centre, then bring the adjacent radial edges together. The centre passes the angle check because six 60° points total 360°. This is the star arrangement described by Paper Pieces. Paper Pieces: Diamonds—Beyond the Sparkle

Next, place a second proposed star beside the first. Trace any space between them onto spare paper and inspect its outline. Determine whether your chosen filler matches every boundary segment and corner. A successful star centre does not establish that the stars connect in your chosen arrangement; the spaces between them need their own test.

If two shorter edges will meet one longer edge, mark the intermediate junction explicitly. For example, two illustrative 1-inch segments total 2 inches only when they form a straight line. An angled pair does not create a straight 2-inch joining edge. Compare the entire boundary, including its changes of direction.

Change one thing at a time so that the cause remains visible. Begin with bare papers whenever possible; this separates template geometry from fabric preparation.

What you observe	What to check next
One endpoint matches, but the other overhangs	Measure both joining edges; confirm units and the supplier’s size definition
Edges match, but the centre remains open	Count the corners at the centre and add their angles
The centre closes, but neighbouring motifs leave an unexpected space	Trace the space and check the proposed filler’s complete outline
Printed copies differ from purchased papers	Measure the printout against its stated dimensions; check printing scale
Bare papers fit, but basted pieces do not align	Compare the fabric folds with the paper edges and corners

For a printing-scale check, consider an explicitly illustrative error: a nominal 1-inch edge printed at 95% becomes 0.95 inch, a difference of 0.05 inch. Measure the actual output before printing a full batch. If the pattern includes a calibration square, check both its width and height; a matching filename or size label cannot confirm the printed dimensions.

If the papers pass but the fabric pieces resist joining, inspect the pointed fabric tails. Sue Daley instructs makers to leave these tails extending beyond appropriate shapes and to keep them out of star seams. Her method also keeps the fabric snug around the card. Use those preparation checks before changing a template that already fits on paper. Sue Daley Designs: English Paper Piecing General Requirements

After the paper layout works, baste and sew a small sample containing the most demanding junction and one connection between motifs. Check that the folded corners meet as intended and that the sample opens flat. This final trial lets you assess your preparation and assembly method alongside the geometry.

Keep the successful paper arrangement, label its shapes and note which edges join. You then have a concrete reference for preparing the remaining pieces. The decision rests on three observable results: the seam endpoints match, enclosed junctions close, and neighbouring motifs connect in the layout you intend to sew.

• Hexagons — Paper Pieces
• 60 Degree Diamonds (6-point) — Lina Patchwork
• English Paper Piecing General Requirements — Sue Daley Designs
• Tessellations — Polygons and Polyhedra — Mathigon
• Diamonds- Beyond the Sparkle — Paper Pieces
• 120 deg Triangle / Diamond-Half — Lina Patchwork