How Far does 1 KG of 3D Filament go?

[old man emu]

I weighed a metre of 3mm ABS filament today. It weighed 7 grams.

There are 1000 grams in a kilogram, so 1000/7 = metres per kilogram = 142.8.

The cross-sectional area of 3mm ABS filament is: pi * 1.5^2 sq mm (or pi * .15^2) sq cm = 0.7068 sq cm

One kilogram of filament contains 142.8 metres of filament.

142.8 metres is 14280 cm

The volume of ABS in a kilogram spool is: 14280 * 0.7068 = 1009.39 cc

It costs me $50 per kilo spool of ABS filament, delivered. That's 5000 cents per spool.

My cost per cc of filament is 5000/1009.39 = 4.95 cents

My cost per metre is 5000/142.9 = 34.98 cents

That makes the price of printing a Wades Extruder $2.83. Given that the Australian dollar buys about $US0.95, does about US2.70 sound right for this part?

Since $10 per spool is delivery charge, I think I'd better look elsewhere for my filament.

Old Man Emu