Summary

A two‑part extrusion system designed for producing Wreath cake (Kransekage) quickly, consistently, and with identical form every time. Both components are made from 3D‑printed, food‑safe plastic.

1) Outer Tube (Extrusion Barrel)
The outer tube is 3D‑printed in durable, food‑safe plastic such as PETG or PLA+.
Its internal geometry is smooth enough for the dough to move through freely without any lubrication.
At the front, the tube ends in a slight bulge — a deliberate constriction that compresses the dough as it exits. This final shaping zone ensures the mass is compacted evenly, resulting in a smooth, homogeneous surface on the extruded strand.
The fixed‑diameter opening defines the exact thickness of the dough, guaranteeing consistent results. Wall thickness and structural design prevent flexing under pressure, ensuring stable, repeatable extrusion.

2) Plunger (Straight Piston)
The plunger is completely straight and printed to fit precisely inside the tube (0,2mm gab).

To achieve the best possible compression effect at the bulged end of the tube, the plunger should be pressed with a consistent, uniform speed. This steady motion ensures the dough is compacted efficiently, resulting in a smooth, dense, and structurally stable strand.

Because the plunger is straight and the tube provides the final compression through its bulged end, the system ensures uniform density and a clean, professional finish on every extrusion.

How It Works in Practice
Fill the outer tube with Wreath cake dough.
Insert the straight plunger.
Press with a steady, consistent speed to ensure optimal compression at the bulged end.
The dough exits as a uniform, smooth, compact strand.
When the plunger reaches the bottom, the dough is cut cleanly with a knife to separate the finished strand.