In 3D printing, a cold pull is a technique that involves using a piece of filament to clean the nozzle of the printer. This is done by heating the nozzle to the extrusion temperature and then pulling the filament through it while the nozzle is still hot. The purpose of this is to remove any debris or leftover filament that may be clogging the nozzle, which can improve the quality of the printed object by reducing the amount of filament waste and increasing the strength of the finished product.
If you have a clogged nozzle on your hotend, don't immediately take it apart. Instead, try the cold pull method, also known as the "atomic pull". This technique involves using a strand of filament with a molten tip to pick up any material or debris that is clogging the nozzle. By pulling the strand out, you can potentially remove the clog without having to disassemble the nozzle. This method can often fix clogged nozzle issues without risking injury or incorrect reassembly.
Time needed: 1 minute.
To perform a cold pull, follow these steps:
- Heat up the hotend to the temperature you would normally use for the type of filament you are using.
- Cut off a short strand of filament and carefully insert it into the nozzle so that the molten tip comes into contact with the clog.
- Allow the strand to cool for a few seconds, then carefully pull it out of the nozzle.
- Repeat this process a few times, allowing the filament to cool in between pulls.
By performing a cold pull several times, you can often remove the clog without having to disassemble the hotend and nozzle. This can save you time, effort, and potential injury or incorrect reassembly.