This is the lowest cost and most basic filament extruder,
The cost of the parts (Extruder body) shown at the beginning of the video is about $50,
They come from massproduced products, so they are much cheaper than making one individually.
I used a stainless steel water pipe with a diameter of 25MM and a wood drill with a diameter of 20MM
But it still takes a lot of time and tools to deal with and modify them.
The parts shown at the beginning of the video are all necessary.
This is the result I got after many attempts.
Missing or changing the structure will cause problems.

This extruder cannot accurately control the diameter of the filament, it will jump between 1.75+0.1MM, but it can still be used for 3D printing.
Especially when printing large parts, it is difficult to find a significant difference between it and the purchased filament.
But the cost of printing will be greatly reduced, and the plastic pellets only cost about US$2 per kilogram.
If you often need to print large parts or models that do not require high accuracy, it is very worthwhile to make it.

If you buy 50 kilograms of filament + shipping costs $1,000, then it only costs $100 to make the filament at home, which can save more than $800 of the cost.
I have used it to make 25 kilograms of filament for the production of large decorations.

I have found a simple and lowcost way to improve the accuracy of filament diameter, if you want to know, please subscribe to my channel



If you want to buy some parts in this video, you can check my website
https://diychen.net/
https://www.ebay.com/usr/diychen.xyz


3D printed STL file of the cooling water sink
https://www.thingiverse.com/thing:480...
Dial indicator bracket
https://www.thingiverse.com/thing:483...