When you print a lot with your 3d printer, you end up with many spools of filament that have only a few grams of it leftover. If you don't know exactly how long the filament on the spool is, you don't see what you can still print. But you also don't want to unwind the filament of the spool to measure its length.
In this post, I want to show you how to get more things printed with all those little leftovers.
First, we need to determine how much filament we do have and second, how much is required for a specific print.
1. How much filament do you have?
You need to weight the filament on a good scale. The scale should be very precise in the range of 0-200g. Most of those scales have a flat surface and it is difficult to put the filament coil on it.
That’s why I designed this specific filament holder. It can be used on the scale and holds small filament coils in the middle of the scale. Remember to tare your scale with the holder so you don’t include the holder in the measurement.
You can download this holder at https://www.thingiverse.com/thing:2771321 and print it yourself.
I typically end up with a bunch of filament coils that are weighted when cleaning up all the almost empty spools.
2. How much do you need for a specific model?
There are many small and useful prints that you can use for the leftovers. My favorites are either somehow helpful or great small presents:
- Bag Clips - https://www.thingiverse.com/thing:330151
- Filament Clips - https://www.thingiverse.com/thing:282242
- Keychain as Smartphone Stand - https://www.thingiverse.com/thing:1587568
- Bike Business Card - https://www.thingiverse.com/thing:714484
- Micro Catapult - https://www.thingiverse.com/thing:1763518
You then upload your model as usual in your slicer of choice.
Most slicers can show how many grams of a filament is required for a specific model. Ensure that you have the correct density settings in your slicer for the material you want to use. I do use 1,25 grams/cm^3 for PLA, and this works fine.
Other density values for common Materials
| Material | Density |
|---|---|
| PLA | 1,21–1,43 g/cm3 |
| ABS | 1,04 - 1,12 g/cm−3 |
| PETG | 1.23 g/cm3 |
| HIPS | 1.03 - 1.04g/cm3 |
| Nylon | 1.06 - 1.14g/cm3 |
A detailed overview of more materials and also other properties you can find at Simplify3d. https://www.simplify3d.com/support/materials-guide/properties-table/
What you also need to know is, how much filament is between your feeder and your print head. If you have a 3d printer with a feeder that is connected to a Bowden tube with the printhead, you need additional filament of the length of your Bowden tube to calculate it.
You should cut a piece of a filament to this length and weight it.
For my Ultimaker 2+, it is about 8g for PLA filament that is required.
If your feeder is direct at the print head, this should be a lot less.
Knowing how much grams you need for your model (model weight + feeder to head weight) and knowing how much your filament weighs, you can now start printing all the small gadgets!
Have fun and happy printing!