The fundamental part of the gimbal delta printer is a 2-axis gimbal holding a nut that takes a 1/4"-20 threaded rod. Each gimbal nut requires four 684ZZ bearings. If you have four gimbal nuts, two mounted to one surface and two mounted to another, you can have parallel arms as they are used in a Rostock delta printer to keep the tool mount platform horizontal.

So you have three pairs of arms like a Rostock, but instead of moving the upper ends of the arms up and down on linear rails, you shorten and lengthen the three arm pairs. The gimbal nuts on the tool mount platform are not allowed to rotate, and the threaded rods are epoxied into their nuts, again to prevent rotation. The gimbal nuts on the printer frame, at the upper ends of the arm pairs, are driven by a GT2 timing belt to turn in synchrony, maintaining the parallel-ness of the arm pairs. The belt for each pair is driven by a stepper motor.

Put a reasonably flexible connector on the tool mount platform, and it will accommodate a router or an extruder or a laser engraver, or maybe just a marker for plotting.