Hand Sewing Finger Guide, mm & SPI Stitch Spacing
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Finger-worn stitch spacing guides for hand sewing: 3, 4, 5 mm and 6, 8, 10 SPI. STL, 3MF and OpenSCAD source.
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Even hand stitches without a ruler. Slip it on a finger, stitch from notch to notch.
Files
STL: set_default.stl. Plain mesh, any slicer.
3MF: stitch_guides_full_set.3mf. Bambu Studio project with my tested settings (PrusaSlicer opens the geometry).
SCAD: stitch_guide_mw.scad. The parametric source, for any other size.
Which spacing?
6 stitches per inch is the usual target when you start hand quilting. 8 to 10 is where experienced quilters sit.
3 to 4 mm suits fine hand stitching and most leather work, 5 mm thicker fabric, felt and heavier thread.
Every guide has its size printed on the tab, so they never get mixed up.
Doing Sashiko? There's a version with the 3:2 stitch to gap rhythm: Sashiko Stitch Guide.
How to use it
Slip the ring onto a thumb or finger. The tab is notched on both edges, so it works in either hand.
Lay the tab along the seam line.
Bring the needle up at one notch and down at the next.
Colours
The photos show white with black markings. The markings are a single layer, so with an AMS that is two filament swaps per plate. No AMS? Map both filaments to one and run a fine marker over the raised ticks.
Need another size? Customise in OpenSCAD
Download the .scad file and open it in OpenSCAD (free). Every option below is in its Customizer panel.
Any spacing in millimetres or stitches per inch, from 2 mm up
Ring sizes 15 to 25 mm (wrap a paper strip round the finger at the middle joint, measure it and divide by 3.14)
Tab length
Body and marking colours
An edge gauge with a lip that hooks over the raw edge, for blanket stitch, whip stitch and hemming
Print settings
Material: PLA or PETG
Layers: 0.2 mm
Walls: 4
Infill: 25% gyroid
Supports: None, flat as supplied
Elephant foot compensation: 0
Wall order and seam: Outer wall first and a scarf seam, for clean notches. The 3MF here already has both
The design decisions and the testing here are mine, and I made these for my mum, who sews. The OpenSCAD was written with Claude, and every version was rendered and measured before it went up.
If it is useful, a like and a make with a photo really help. I read every comment.
Also on MakerWorld: https://makerworld.com/en/models/3339043