Pennys Filament Measuring Ruler

While I found the original model excellent I thought this could be improved slightly, so I added the following

Big hole so that it can be hung up when not in use. Curved bottom so it registers better on the spool with no wobble Viewing slot down the middle so you can line it up with a reference point on the spool (Although not needed with the curved bottom)

Prints really well and on my Neptune 4s it takes about 20 minutes to print using just over 7g (Just over 2 meters) of filament so very useful for those little ends of filament you get left with, too long to throw but too short to do any projects with.

I like to print mine off with a contractsing filament colour change to ease my eyesight, but still works well in a single colour.

How to use Place the ruler on the filamant in a spool and hold against the side of the spool. Where the top of the spool reaches the level of the ruler it tells you roughly how much filament you have left.

WARNING - Only really works on spools that do not wind all the way to the edge of the filament