Instant springs with this 9 grams (0.30 oz) spring factory.
Works with 0.8mm to 1.5mm "normal" steel wires and 0.8 to 1.2mm piano wires.

This is an update from my previous Spring Factory (https://www.thingiverse.com/thing:5142754), with many improvements, the main one is that you can now use piano wires.

You'll need a good wire cutter if you're using piano wire.
On the video, i used 25 centimeters (10 inches) of 1.2mm piano wire
The "spring factory" is easy to print (no supports) on you 3d printer. You just need 9 grams (less than 4 meters) of PLA filament.
It took less than 80 minutes to print it on my Ender 3 V2.

Watch the video in order to see how it works : https://youtu.be/QOz2l867N_4

On the video, i used 25 centimeters (10 inches) of 1.5mm stainless steel wire.

Print Instructions:
Just print the two things with the classical 0.4 nozzle. There should be no problem with clearance.
No need for supports.
No need for raft
Layer Height= 0.2 (probably works with 0.28 layer height, but i did not try)
Use 5 walls, 4 top layers and 4 bottom layers.
20% infill is enough.

printed on an ender3 V2, using cheap GST3D PLA filament (8€ / kg). Total cost is around 6 cents with this PLA, and probably a bit more than 10 cents with other brands..

Printing time: Bolt= 20 minutes Screw: 58 minutes at 50mm/s Cap: 3 minutes

Final spring has a 9mm external diameter. length is about 32mm

List of improvements (version 1.2):
Both parts are easy to handle
Able to handle 1.2mm piano wire
A cap is provided in order to put the spring on a flat surface (watch the video)
The wire can be locked with a simple system
I've added some length to the screw, so you can make longer springs.