Here we have a well engineered prism shaped sign to use for your own purpose.

All parts slot together and secure with a single 3mm bolt and knurled threaded insert.

The front panel will need customising with your own text - this can be done fully in the slicer - check the youtube video for a demonstration.

Print in an orientation that suits you but supports should not be needed. I did use brims to help with bed adhesion.

If you print this, please show me on social media! Tag @kwerkshop

For full assembly, see my Youtube video here