Top-Hat Bush & Mould Generator

Punch in the dimensions of a top-hat bush. Download a printable STL — either the bush itself, or a single-piece PVA mould to cast it in polyurethane.

Bush dimensions

Outer diameter (OD)

main cylinder, in mm

Inner diameter (ID)

crush-tube hole, in mm

Total length

flange + crown, in mm

Flange OD (brim)

in mm

Flange thickness

brim height, in mm

Corner chamfer

45° chamfer at the flange/crown corner. 0 = sharp. Max = (Flange OD − OD)/2 for full 45° supportless print.

cross-section · dimensions in mm

Total PU needed —

Per part (50/50 split) —

grams based on density 1.10 g/mL (~95A polyurethane). Slight overshoot recommended for pour loss.

🥽 Mould (PVA, dissolvable) ⚙️ Bush (TPU print)

Shell wall thickness

uniform PVA shell + base. 0.5mm = 1 perimeter on 0.4mm nozzle.