Project homepage: jonnor/projects/clothing.
Made in collaboration with Annika Rockenberger.

Designed for laser-cutting. Key ideas:

• Using a fold of doubled fabric as connecting loop, for strength
• Using laser to fuse synthetic fabric, to avoid fraying edge and sewing

Process:

• Take a piece of Polyester, or similar synthetic textile
• Optional, recommended: Use gluestick PVA/like for paper, on the fabric, to ease folding
• Fold it over to make a loop, pressing the two sides firmly together
• Tape the textile onto a piece of wood, stetched out evenly
• Load the DXF file, position the pieces with fold/watch-side aligned vertically
• Run the job such that the origin is slightly before the fold. This to avoid cutting off the fold
• Open up the fold, insert here pins and attach to watch
• Attach clasp by putting pin through stitch holes (other end of short piece)

We had best fusing results when moving the laser slightly out of focus (13.5 mm instead of perfect-focus 10.5mm),
and when having air-assist turned off. On our Redsail 60w laser, we used 30 mm/second speed and 3% power.

Made for a Casio digital watch, but can be adapted to most watches. Length is parametric in the source files.
We reused the existing clasp, but one can probably 3d-print one.