Filament Joiner with PTFE Tube

Filament Joiner

For filament with a diameter of 1.75mm. It also works wih homemade pultrusion filament.

Build Instructions

What you need

• 6x M3 Heat Inserts
• 4x M3x14 Screws (longer screws will work as well)
• 2x M3x6 Screws (Also here, longer screws will work just fine, )
• PTFE-Tube with a length between 44mm and 34mm (A shorter piece might also work, but is just held by one single screw)
• [Optional] 4x M3 washer. 
• Heat source (e.g. soldring iron)

How to build it

1. Print both parts
2. Insert the heat inserts into the holes. The chamfer on the hole indicates from which side the inserts should be introduced.
3. Put the two halves together with the PTFE tube in the middle.
4. Insert the M3x14 screws to hold the two halves together. The screw head needs to be on the side without heat insert.
5. Insert the M3x6 screws, to hold the PTFE tube in place.

How to use it

You need a heat source of any kind. I use a soldering iron, but some people on youtube seems to be doing great with just a candle. Keep in mind, burn injuries are no joke and heat sources often times come with a fire hazard. So use your new gadget with care and take all the necessary precautions to minimize the risks.

After that, the process is simple enough. 

1. Put the two filament ends into the joiner
2. Heat up the ends until they start to melt. 
3. Press the two ends together
4. Silde the (still warm and soft) joint through the PTFE tube

With a quick search on youtube, you will find some demonstrations and explanations of the process.