With this tool you can measure the filament used in meters, I wanted to know if I can came up with something to measure the filament used and note the meters I used for certain spool I use.

After long search I found a fishing line depth gauge, ordered one and deigned a housing for it, you can use your 4mm outer diameter filament tube, there is no need to drill a hole, there is a little drag from the tool but it is not that much. If your printer don’t print accurate just drill the holes, the inner holes are 2mm.

There is no need for supports, print in same orientation as I put it in the STL file.

If you already have extruder skipping problems, this probably won’t work for you, if you want to try go with a small print just to test.

You need a O ring (put it on the wheel like I did) and a fishing line depth gauge, the gauge can be found here:
https://www.aliexpress.com/item/pesca-1-pcs-fishing-line-depth-gauge-counter-fishing-tool-tackle-fishing-line/32732008218.html

There is also a digital version of this gauge, but I am not sure if it has the same dimensions, I will probably order one in future to test, but here it is:
https://www.aliexpress.com/item/999-9M-Fishing-Line-Counter-Digital-Display-Fishing-Line-Depth-Finder-Pesca-Fishing-Tools/32419148952.html

EDIT: After a comment from jwass I realized I made a mistake putting a big O-Ring in the middle of the wheel, this was making the gauge measure wrong, I have fixed that and used a O-Ring again but this time it is smaller and it will be glide the filament through together wit the wheel. But the the first version is 34 times downloaded, I didn't expect this to be downloaded that much in one day, my apologizes for those 34 downloaders, I hope you didn't find out too late. I wish I could put the v2 sooner but when I try to print my printer start to act, and on one part of the bed it is printing higher, I was 4 hours long busy to fix that, I got it working but there is still some problem with that side of the bed, I think I bend the X rod while removing the filament because it was stuck.

Check the video, it is pretty accurate now:
https://www.youtube.com/watch?v=brVCErCoEOQ

I made also a version for my printer (Anycubic 4Max)
https://www.thingiverse.com/thing:2874239

I didn’t put any extra holes to mount, since the mounting point will be different for each printer.

I love to hear some feedback if anyone try this tool.