This is a bolt knob for the thermostat of my Sunset Trail 2018 travel trailer. It's for retain the thermostat controler on the wall. It probably fit on other travel trailer brand.

Printed with a Delta Kossel printer with this setting and PLA filament. It is a softer material than the ABS. You can generate support but the part is very small and as no longer use support.

Infill = 100%
Extruder = 200C
Bed = 60C