After a few days faffing and two failed test prints I got my printer working-
28mm test Rook
Even the writing on the top came out.
Then decided to try one of my models for a 2nd test print. 1/16 scale Vickers HMG (about 71 mm long).
Bloody amazing for a printer that cost a little over £400 ($500) including shipping from China (though I did get hit with £36 import duty). Still my first printer cost £800 three years ago.