AI Skill Report Card
Preparing Pattern PDFs for Printing
Quick Start13 / 15
Before printing any pattern PDF, always verify scale first:
- Measure the printed test square (usually 1" or 10cm) with a ruler
- If it's off, compute reprint percentage:
target_size / measured_size × 100 - Only after scale is confirmed at 100%, choose a print format (home tiling, plotter, or print shop)
Never skip verification — a single degree of scale error ruins every piece in the pattern.
Recommendation▾
Example 1's math is confusing/self-contradictory (works through rotation logic awkwardly) — clean up the reasoning so the conclusion follows clearly from the stated logic
Workflow14 / 15
Progress:
- Step 1: Verify scale (Scale Checker or PDF Scale Verifier)
- Step 2: Choose print format (Home Tiling / Plotter / Print Shop)
- Step 3: Modify PDF if needed (seam allowance, lengthen/shorten, FBA/SBA, grading, layer toggle, projector prep)
- Step 4: Convert format if needed (tiled↔plotter)
- Step 5: Output final print-ready file or instructions
Step 1: Verify Scale
Scale Checker (physical measurement):
- Ask for the test square's printed size vs. its labeled size
- Formula:
reprint % = (labeled size / measured size) × 100 - Example: labeled 1" square measures 0.96" → reprint at
(1/0.96)×100 = 104.2%
PDF Scale Verifier (digital check):
- Confirm page dimensions match expected paper size (Letter: 8.5"×11", A4: 210×297mm)
- Locate test square object in the PDF and compare its vector dimensions to its label
- Flag: missing test square, non-standard page size, non-100% PDF scale setting, mixed units
Do not proceed to formatting until scale reads 100% (or the exact reprint percentage is documented for the user).
Step 2: Choose Print Format
Ask (or infer from context) which output the user needs, then use the matching tool logic:
Home Printer Tiling (Letter/A4):
- Input: overall pattern width × height
- Compute page grid:
cols = ceil((width - overlap) / printable_width), similarly for rows - Printable area = paper size minus margins (typically 0.25"–0.5" per side) minus overlap allowance (~0.5"–1")
- Output: page count, grid layout (e.g., "3 columns × 4 rows = 12 pages"), assembly order (label pages A1, A2, B1, B2... row-column), taping instructions (align markers, trim margin on right/bottom edges before taping to next page)
Plotter Calculator (24"/36"/44"/60" rolls):
- Input: pattern width × height, roll width
- If pattern width ≤ roll width: single-length cut,
roll length needed = pattern height + margin - If pattern width > roll width: rotate 90° if height fits within roll width instead; otherwise flag that tiling is required
- Output: roll length in yards/meters, orientation, layout diagram description
Print Shop Guide:
- Match pattern dimensions to smallest standard sheet that fits: A0 (841×1189mm), A1 (594×841mm), Arch D (24"×36"), Arch E (36"×48")
- Output: sheet size, required margins, orientation (portrait/landscape), and exact instructions to relay to the print shop ("print at 100%/actual size, no scaling, no auto-fit")
Step 3: Modify (Optional)
Pattern Modifier — detect pattern piece boundaries in the PDF, then apply:
- Seam allowance: offset piece outline outward by specified amount (e.g., 5/8", 1cm)
- Lengthen/shorten: cut piece at designated lengthen/shorten line, add/remove specified amount, reconnect smoothly
- FBA/SBA: pivot-and-slide adjustment at bust point by specified amount
- Grading: scale piece outline between size lines by specified increment
Layer Toggle — for multi-size layered PDFs, keep only the requested size layer(s) visible; flatten/export a single-size clean copy.
Projector Prep — invert to dark background, increase line weight (2–3pt), boost line color contrast (bright cyan/yellow/white), remove unnecessary text/labels that clutter projection.
Step 4: Convert Format (Optional)
- Tiled → Plotter: stitch multi-page tiled PDF into one continuous page sized to the plotter roll width; eliminate overlap margins used for taping.
- Plotter → Tiled: split single large-format page into a Letter/A4 grid, re-adding overlap margins (~0.5"–1") on each cut edge for reassembly.
Step 5: Fitting Summary (if requested)
Compile all applied adjustments (SA amount, lengthen/shorten amounts, FBA/SBA amount, grading) into a single printable summary card for the cutting table.
Recommendation▾
Add a third example showing a simple, fully-successful case (e.g., plotter fit with no complications) to contrast with the two edge-case-heavy examples
Examples15 / 20
Example 1: Input: "My test square measures 3.8cm instead of 4cm, and I need to print on a 36" plotter. Pattern is 42" wide × 60" tall." Output:
- Reprint at
(4/3.8)×100 = 105.3% - After correction, pattern is 42" wide — exceeds 36" roll width, so rotate: 60" width now fits within roll... but 42" height still exceeds nothing; recommend printing with the 60" dimension along the roll length and 42" across — still exceeds 36". Flag: pattern must be tiled lengthwise on the plotter, or split into two roll segments.
- Roll length needed: pattern height (60") + 2" margin = 62" ≈ 1.72 yards, with a note that width exceeds single-pass plotter capacity.
Example 2: Input: "Home printer, Letter paper, pattern is 34in x 22in, need 5/8 inch seam allowance added and want to lengthen the bodice 1 inch." Output:
- Apply Pattern Modifier: add 5/8" SA offset to all piece edges, then lengthen at marked line by 1"
- Tiling: printable area ≈ 8" × 10.5" per page (0.25" margins, 0.5" overlap) →
cols = ceil(34/8) = 5,rows = ceil(22/10.5) = 3→ 15 pages, labeled A1–E3 - Assembly: trim right/bottom margins per page, align overlap marks, tape in row-major order
Recommendation▾
Include a brief note on file formats/tools expected (e.g., PDF manipulation library or assumed manual measurement input) since some steps imply digital PDF parsing capability
Best Practices
- Always verify scale before any formatting step — treat it as a blocking prerequisite
- State reprint percentages to one decimal place
- When pattern dimensions are near a size boundary (e.g., 35.5" vs 36" roll), flag it explicitly rather than assuming a fit
- Default overlap/margin assumptions (0.25"–0.5" margin, 0.5"–1" overlap) should be stated so the user can adjust
- For print shop instructions, always explicitly say "print at actual size / 100% scale, disable auto-fit/shrink-to-fit"
- Recommend rotating a pattern (portrait↔landscape) before recommending tiling, when it would eliminate extra pages/tiles
Common Pitfalls
- Don't compute page tiling before confirming scale — wasted paper if scale is wrong
- Don't forget seam allowance already baked into a pattern; ask whether SA is included before adding more
- Don't assume PDF page size equals paper size — a Letter-page PDF can still be scaled internally
- Don't ignore rotation options when checking plotter roll-width fit
- Don't apply FBA/SBA or grading without confirming the pivot point / adjustment amount with the user first
- Don't output tiling instructions without margin-trim guidance — un-trimmed overlaps cause misalignment