"Loft to Point & Batch Printing" — Product Design Online

Why this is in the vault

Day 15 of the 30-day Fusion 360 series introduces two practically valuable techniques — loft-to-point for pyramid/tapered forms and rectangular pattern for batch 3D print layout — directly applicable to any 3D-printable part design workflow.

Episode summary

Kevin Kennedy models a 3D-printable painter's tripod (pyramid shape) using a hybrid design file. The core techniques are: sketching a fully-constrained equilateral triangle, using an equation-driven offset construction plane to place a projected center point, then lofting the triangle profile to that single point. The resulting solid is shelled, face-cutouts are added via circular pattern, and the component is batch-duplicated with rectangular pattern referencing the sketch dimension as spacing.

Key arguments / segments

[00:00:00] Intro — painter's tripod project overview; use hybrid design file for later batch printing.
[00:01:01] Sketch equilateral triangle on XY plane — equal constraints on all three sides, construction lines from midpoints to vertices to find true center, coincident + horizontal constraints to fully anchor the triangle to the origin.
[00:02:01] Add a center point using the Point tool, apply coincident constraint to lock it to origin; without this snap point, the constraint cannot be applied to the triangle vertex.
[00:03:00] Apply 50 mm sketch dimension to one side — equal constraint propagates it to all three sides. Sketch turns fully defined (geometry goes black, lock icon appears in browser).
[00:04:02] Equation-driven offset plane: height = (D1 * sqrt(6)) / 3 — ties the apex height to the triangle's single driving dimension, making the model a true parametric tetrahedron. Project the bottom center point up to the new construction plane.
[00:06:02] Solid loft (blue, not orange surface loft) from triangle profile to the projected sketch point — completes the pyramid with a single driving dimension. Verified by editing dimension to 100 mm and confirming everything doubles.
[00:07:01] Shell command (2.5 mm, bottom face selected) hollows the pyramid and removes the base, making units stackable. Face cutouts added on one triangular face via offset (-6 mm) then extruded using "to object" extent referencing the inner shell surface — avoids hardcoding the thickness.
[00:09:01] Circular pattern on the extrude feature (not body), Z axis, quantity 3 — applies cutout to all three faces. Fillets (1–2 mm) added to top edges.
[00:10:00] Batch print setup: unground the component from parent before patterning. Rectangular pattern on component object type; spacing set to D1 dimension parameter so parts automatically space by their own footprint + clearance.
[00:11:02] Pro tip: pattern spacing can reference any model parameter (D1), not just a hardcoded number — enables auto-adjusted layouts when the base design changes.

Notable claims

[00:04:02] The tetrahedron height equation (D1 * sqrt(6)) / 3 is a real geometric relationship — height of a regular tetrahedron with edge length D1 is D1 * sqrt(2/3), which simplifies to the same form. Kevin uses Fusion's expression editor to enter this directly.
[00:06:02] Loft-to-point requires the solid loft command (blue icon), NOT the surface loft (orange) — a common mix-up in Fusion's toolbar.
[00:07:01] Selecting the bottom face in Shell removes that face entirely, making parts stackable. Selecting the whole body creates a closed hollow shell — two valid use cases.
[00:08:00] Using "to object" extrude extent instead of a hardcoded depth makes the cutout track shell thickness changes automatically — key parametric design habit.
[00:10:00] Components in Fusion are auto-grounded to the parent by default; must explicitly unground before patterning if you want to reposition instances.

Mapping against Ray Data Co

Strong fit. This episode directly supports Ray's digital manufacturing interest — the painter's tripod is a simple, practical 3D-printable part, but the techniques (loft-to-point, equation-driven planes, shell, circular pattern, batch print layout) are reusable for any tapered enclosure, jig, or fixture design. The batch-print pattern workflow using dimension references is especially relevant: RDCO could apply this pattern when designing standardized product holders or test fixtures for print farms. Day 16 (user parameters) will deepen the parametric design thread established here.

[[2026-06-14-product-design-online-fusion-360-day-14-sketch-constraints]] — previous day; sketch constraints are a prerequisite for fully-defined geometry used in today's loft
[[2026-06-13-product-design-online-fusion-360-day-13-construction-planes]] — construction planes; today's offset plane workflow builds directly on that lesson
[[2026-06-12-product-design-online-fusion-360-day-12-screwdriver]] — first complex 3D-printable project in the series