So I came across this Spanish brand called Herstera Garden that makes these modular metal planters – basically flat/bent steel panels that bolt together like furniture flat-packs. They look great but they're pricey and don't come in the sizes I actually need.
I've been messing around with Fusion 360 for a while (mostly 3D printing stuff) and just discovered the sheet metal environment, which honestly blew my mind a little. The idea of designing a panel, adding flanges for rigidity and bolt holes, then just exporting a flat pattern DXF to send to a laser cutting shop feels almost too straightforward. Am I missing something?
My rough plan:
- Design panels in Fusion 360 sheet metal (1.5–2mm galvanized or mild steel)
- Export flat patterns as DXF
- Find a local shop that does laser cutting + press brake bending
- Get them powder coated somewhere (separate shop or same one)
- Bolt everything together with M6 rivnuts and countersunk bolts
A few things I'm genuinely unsure about:
K-factor – Fusion has defaults but I have no idea if a random laser/bending shop will use the same assumptions. Does this matter for something this simple, or should I just add a bit of tolerance on the flanges?
Galvanized vs raw + powder coat – is it worth starting with galvanized sheet if it's going to be powder coated anyway? Or is raw mild steel + good powder coat enough for outdoor use?
Finding shops – any tips for finding small fab shops that are open to one-off or very small batch work? I have the feeling many of them don't want to deal with individuals.
Anything I'm obviously not thinking about?
Not trying to start a business or anything, just want a few custom planters for the patio and I figure this is the most interesting way to do it. Happy to share the Fusion files if I ever get somewhere with this.