This filament welder allows to join 1.75mm filament without sanding or other post processing.
You will need A PTFE tube and coil spring.
-PTFE tube: Length: 40mm, 1.8mmx2.6mm
-Coil spring i took mine from ballpen
Instruction of use:
Spring keep heat a bit longer, so when you push filament from both sides and heat it by lighter or heat gun in the middle. Snap it between covers from both sides, press tight as you can, and push the filament from one side till joint come out from other.
WHY DO YOU NEED A SPRING?
When you heat the PTFE tube, it softens. Two filaments are pushed in from both sides in that state, and the tube expands at the butted part. A spring is installed to prevent this expansion. Therefore, when you choose a spring, its inner diameter should be approximately the same as the outer diameter of the tube.
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.