How to orient a part on the print bed to avoid supports

1. The 45° rule

Each layer rests on the one below. If the new layer sticks out by no more than its own height, it holds itself up — that works out at roughly 45° from vertical. Beyond 45°, the plastic starts to droop and you need support.

In practice: surfaces leaning up to 45° from vertical print cleanly. Anything flatter — and any horizontal ceiling hanging in the air — needs support or another orientation.

2. Short bridges are fine

A horizontal ceiling spanning between two walls (a bridge) prints without support if it is short: 5–10 mm almost always, up to 30–50 mm with good cooling and low speed. The plastic is pulled straight between the ends like a string.

3. Big face down

• Put the largest flat face on the bed: better adhesion, no movement, no lifting corners.
• Fillets on the bottom edge print badly — use a 45° chamfer there instead of a radius.
• Text and fine detail come out best on vertical faces or on the top face.

4. Layers decide strength

A printed part is much weaker between layers than along them — the bond between layers fails first. A hook printed standing up snaps under the first load; the same hook printed on its side holds several times more.

Think about where the force pulls and orient the part so the force runs along the layers rather than prying them apart.

Check before the slicer

GrafitGo's print check tells you what share of the part's surface needs support, whether it fits the bed and whether it is closed. Rotate the part, press “Check the model” again and see whether the share drops — without going through the slicer every time.