Toolpath technology for additive manufacturing
TruePath is a slicing technology that prints a part's outer skin and its internal load-bearing structure as one uninterrupted toolpath — no wall, no separate infill, no seam between them.
Developed by Roger Kilsdonk · Independent inventor
01 — The problem every slicer shares
Conventional slicers — planar, non-planar and multi-axis alike — build a part the same way: trace an outer wall, then fill the space inside it with a separate infill pattern.
That split is the source of the familiar weaknesses: a seam where wall meets infill, stringing between unconnected members, and toolpaths broken up wherever the raster logic happens to cut them. Vase mode prints one clean wall — but add anything inside and the continuity is gone.
TruePath removes the split itself.
02 — What it produces
The toolpath never stops, retracts or jumps across a part — from first move to last.
Trusses and corrugation run in the same path as the outer wall, not as a separate fill poured in afterwards.
The weak boundary between perimeter and infill — the place parts delaminate — simply isn't there.
The internal structure follows the load path the engineer specifies, instead of a repeating unit cell dropped over the shape.
Proven on PET-CF and PEEK-CF, and on ULTEM 9085 with aerospace certification.
Thin skins with an integrated truss — the stiffness of a structured part at the weight of a shell.
03 — The proof
The claim is settled by hardware. These are drone wing sections printed on a desktop FDM machine — a continuous skin with the load-bearing structure running through it, in a single path.
Replace the panels below with your own photographs — one backlit shot carries the whole story.
Try it yourself
This is an actual TruePath export — not a rendering, not a simulation. Drop it into any G-code previewer and follow the toolpath: one continuous corkscrew, no wall, no infill, no jumps.
.gcode · opens in your slicer's preview or any G-code viewer
04 — Where it goes next
◆ Design hypothesis — not yet proven in metalIn laser powder-bed fusion the standard is a contour scan followed by a separate hatch infill — and the seam between them is a known porosity hotspot. A stall or a sharp turn of the laser overheats the melt pool and leaves a pore, exactly as a stutter does in filament.
A toolpath that stays continuous, with direction and order built in from the start, targets that failure directly. In a process where a single-digit drop in scrap is measured in real money, that is worth a test.
TruePath has not yet run on a metal system. The metal case is a design-level claim — and an open invitation to a partner with an LPBF machine.
05 — About
Independent inventor, working on a different starting point for toolpath generation. The hardware, the slicing technology and the printed samples are developed in-house.
For technical discussion, licensing, or a metal collaboration, get in touch.
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