To estimate the length of the remaining PLA filament, you now have to **divide the weight by both density and cross-sectional area**. You can therefore calculate the length of the spool by dividing the 350 g by 1.25 g per cubic centimeter.

**Table of Contents**show

## How do you calculate PLA?

Try **touching the surface of the filament and see whether the filament is dry or smooth, with PLA usually being the smooth filament**. ABS has a harsh smell while being heated or printed but PLA emits either little to no smell, or a kind of pleasant sweet smell or like popcorn being heated.

#### How do I calculate pKa?

Calculate the pKa with the formula **pKa = -log(Ka)**. For example, pKa = -log(1.82 x 10^-4) = 3.74.

#### How much filament do I need?

The amount of filament you will need in general – You can easily get away with keeping **2 or 3 spools of 1KG filament on-hand**. If you use a 3D printer capable of printing with 2 or 3 filaments at the same time, then your requirement would also increase accordingly.

## How do you calculate filament weight?

For example, the density of PLA filament is **1.24 grams per CM^3**. This means we know how many meters in a kilogram of PLA 1.75mm to be 335.3 meters. Or if you’re wondering how many grams in a meter is 1,000 Grams / 335 Meters = 2.98 grams per meter.

#### How many grams of filament do I have left?

Find How Much Filament is Left on a Roll#### How much does 1Kg of filament weigh?

Filament Weight | Density | Thickness |
---|---|---|

1Kg | 1.25g/cm3 | 1.75mm |

300mm | ||

3Kg | 1.25g/cm3 | 1.75mm |

300mm |

## How much PLA do I have left calculator?

**Some filament vendors put a window to see the remaining spooled filament with a decal showing graduations to match how much is left based on the diameter visible**. You could do the same as a printed (in the paper sense) insert you slip along the inside of any spool between the filament and outer wall.

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