Bushtracker Roof Vent Knob

A broken roof vent knob shouldn't sideline otherwise good Bushtracker equipment, and with a decent sample to work from it usually doesn't have to. We've made this style of part before and can usually print yours without drama.

Why these break

Vent winder knobs split at the shaft. The factory part is made from styrene-based plastic that loses its plasticisers over the years. It gets glassy, then one warm day it lets go under a load it used to handle easily.

How we reproduce them

The process is simple: drop the part in or send clear photos with a ruler in frame, we confirm fit details, and print replacements — often with a little extra material where the original always cracked.

We print these in ASA. ASA is the UV-stable cousin of ABS — it holds its colour and strength through years of Australian sun where the original plastic went chalky and brittle.

As with everything in our library: whether a part can be reproduced depends on size, load, heat, material, and having a decent sample to work from. Send photos first — the assessment costs you nothing, and we'll tell you honestly if a genuine spare is the better option.