How much distance can a 1kg spool of 3D filament cover? – 2025/08/14

I will be conducting an experiment to find out how many metres long a 1kg roll of 1.75mm 3D Printer filament can stretch when unwound.

Instead of actually unwinding a 1kg spool, we will use math.

Here is the weight of the spool at the start:

630g

The next step is to cut some off, and measure the distance of the amount cut off.

To do this, I will be using a chair. See diagram below:

I measured the distance of the bench using a trundle wheel (1.85m)

I then stretched the filament across the diameter of the bench, and cut it. This resulted in a cut 1.85m long string of filament.

Note: I cut the filament at the top of the bench, ensuring the distance was 1.85m

I repeated this 5 times. The result was a total of 9.25m of filament.

This is the weight after being cut:

600g

Therefore 30g of filament results in 9.25m of length

Now to get 1000g, we should do the following:

(9.25/30)*1000 = 308m of length

That’s our answer, a 1kg roll of filament can stretch out 308m when unwounded!

I hope you enjoyed this article! THE END