A parametric Erlenmeyer flask maker for all your non-toxic, non-exothermic, plastic-compatible needs. Automatically creates labeled lines every 50ml. Naturally, these only make sense if you print in translucent plastic. Coating your flask with epoxy or polyurethane will make it even more transparent. The flat edge of a felt-tip pen easily colors the numbers and gradation lines.
Volumes are calculated, but even with imperfect printer calibration I found the actual fluid volume to be within 1-2%.
The first 3 images are renders, obviously.