About this video
Why Use Slicer-Based Inserts to Connect 3D Prints?
Joining multi-part 3D prints usually means glue, screws, or printing awkward support structures. A faster, cleaner method is to design the connection right inside your slicer using built-in cut and connector tools. This approach is perfect for large models that exceed your build plate, models you want to ship flat, or assemblies that need to be disassembled later.
Step-by-Step: Adding Dowel Inserts in Your Slicer
- Select your object and open the slicer's cut tool.
- Adjust the cut plane so the model splits cleanly into the pieces you want to print separately.
- Click "Add Connectors" to open the joiner menu.
- Choose the connector type — Dowel — and for the strongest fit select Hexagon instead of round. Hexagonal dowels resist rotation far better, which keeps your assembly aligned under load.
- Place the connector at the cut interface, then adjust the size (diameter and length) until it bridges both halves with a snug press fit.
- Confirm connectors, review the preview, and perform the cut.
- Slice and print each piece flat on the bed.
Why Hexagon Dowels Work Best
- No rotation: flat sides stop the parts from twisting relative to each other.
- Self-aligning: the shape guides the two halves into position as you press them together.
- Print-friendly: a hexagonal cross-section slices cleanly with standard FDM nozzles and needs no special bridging.
- Removable: parts can be taken apart and re-assembled without damaging the model.
Pro Tips for Stronger Connections
- Aim for a dowel length of at least 6–10 mm embedded in each side for reliable hold.
- Use multiple connectors spread across the cut plane rather than relying on a single pin.
- Add a 0.1–0.2 mm negative tolerance in your slicer if available to compensate for printer over-extrusion.
- Orient the cut so the dowel holes run perpendicular to layer lines for maximum shear strength.
Frequently Asked Questions
Do I need supports for the dowel holes?
No. Because the connectors are added after the cut, the slicer treats them as part of the model geometry, so the holes print cleanly without support material.
Can I use this for large models that don't fit on my bed?
Yes. Cutting the model into printable sections and joining them with hexagon dowels is one of the most popular ways to print oversized objects on small 3D printers.
What materials work best?
PLA and PETG both press-fit well. For high-stress parts, PETG or ABS dowels offer more flex and impact resistance.
Will the connectors survive shipping?
Yes — flat-packed prints with dowel inserts are lighter, cheaper to ship, and reassemble in seconds with no tools required.
