The open crown is the workhorse shape behind most fedoras, trilbies and soft felt hats — a rounded, gently tapered crown that a milliner pinches and dents by hand once it’s blocked. Formillionaire’s open crown and fedora hat blocks come in single sizes, filament-saving split versions, and multi-size bundles, so both a one-off hobby project and a small production run are covered.
Filament-Saving Designs
Several open crown and fedora blocks in the catalog use a hollowed, filament-saving geometry — the same outer shape and crown height as a solid block, but noticeably less plastic and print time, without losing the rigidity needed for steaming and shaping felt.
What’s in the Range
- Open crown hat blocks, standard and filament-saving
- Fedora open crown blocks, including combined block + brim plate sets
- Open crown bundles covering a full head-size range in one download
Custom Brim, Same Head Size
A fedora needs its own brim curve. Trace a brim outline by hand and turn it into a matching STL plate with the brim plate generator — sized independently from the crown block, so the two combine into one finished hat.
