I purchased a second-hand Paterson Super System 4 Daylight Developing Tank that came with no lid.
I didn't have an original to copy from so I chanced it with this and it works pretty much perfectly.
Printed in TPU
Printed in TPU
0.15mm @ 100% Infill
0.15mm layer height because there's a few curves on the walls that make the fit nice and tight.
The author hasn't provided the model origin yet.