These small bottles were made to reuse 5 liter water bottle caps.

A cap model has been added for those who live in countries whose bottles/caps have an incompatible thread.

Update: 20220821

• A new model as been added to reuse not only de caps but the bottleneck also "roundbottle4040.stl".
  When I did that, i realized that the cap model i posted before didn't have the right dimensions, so i uploaded a new model, slightly larger and with a different thread angle. "threaded_cap.stl".

Update: 20220822
New round bottles uploaded with heigths of 30 50 and 60mm

Anycubic

All-metal Mega

No

No

Nozzle 04, Layer Height 03

doesn't matter

I suggest lowering the printing speed in the area of the threads to 25mms on the outer walls and for printers with boden, retraction=5, that also depends a bit of de length of the ptfe.