If you have ever watched your printer try to extrude plastic into thin air and end up with a tangled mess, you already know the 45-degree rule. Push past that angle and gravity usually wins. But a new slicer fork is rewriting that limit — and it can pull off near-horizontal overhangs with no support material at all.
What is WaveOverhangs?
WaveOverhangs is a modified version of OrcaSlicer that uses a clever toolpath trick to push overhangs all the way to 90 degrees. Instead of laying down lines that stretch into empty space, it prints concentric rings on each new layer. Each ring grabs on to the one printed just before it, like ripples spreading outward across a pond. By the time the layer finishes, the printer has built a self-supporting shelf out of nothing but plastic and patience.
The technique borrows ideas from earlier arc-overhang experiments, but the wave-style toolpath gives the freshly extruded line something solid to anchor to within the same layer. The result: prints that look like they should sag and fall apart but somehow don't.
How it works in your slicer
To try it, you will need to install the WaveOverhangs fork of OrcaSlicer. Once it is set up, the slicer adds new options to its overhang-handling section. There are two algorithms to pick from and a handful of tuning knobs — speed, line width, cooling, and how aggressive you want the wave pattern to be.
- Print slow on overhang sections — typically 10 to 20 mm/s
- Crank up part cooling so each ring solidifies before the next one lands
- Use a small line width (around 0.4 mm with a 0.4 mm nozzle) for cleaner ring contact
- Stick to PLA at first — it cools fast and is forgiving on overhangs
Because the technique is brand new, there are not ready-made profiles for every printer yet. Expect to dial in your settings with a couple of test prints before you nail a perfect 90-degree shelf. The developers also run a community gallery where you can share what worked and what flopped.
Try it on your printer
Most hobbyist machines can handle this with the right tweaks. An Ender 3 with a silicone sock on the hot end and a decent part-cooling fan duct is a solid starting point. Bambu A1 and Prusa MK4 owners have an even easier ride thanks to strong stock cooling. Stick with a 0.4 mm nozzle and a roll of quality PLA from Flarelab while you find your settings — once you have the wave method working, branch out to PETG and see how far you can push it.
Inspired by reporting from Hackaday 3D Printing.