Velleman vertex3d K8400 extruder upgrade - bowden tip

thingiverse

I strongly believe that after years of use, the vertex k8400 requires significant upgrades on the extruder/bowden side. First and foremost, it is essential to shorten the bowden and reposition the extruder exactly as shown by Hardbats here https://www.thingiverse.com/thing:2730016. Secondly, a great improvement in filament loading is achieved thanks to user Blackwolfn's upgrade found at https://www.thingiverse.com/thing:1078641. In my opinion, taking it a step further would be to insert a piece of bowden inside the extruder near the gears to minimize the free movement of filament, especially with flex ones. Therefore, I edited Blackwolfin's upgrade in blender and hope you don't mind, Blackwolfn. I positioned a pipe where the bowden fits perfectly, creating a compatible slot in the second half as seen in the pictures. The length of the piece of bowden needs to be trimmed accordingly, by eye, as shown in the pictures. These two halves are named Base_1 and Top_1. As an additional modification, I created a second set of things with an enlarged nut hole for those who want to change the bowden clip with another one featuring a bigger nut (9.8 mm instead of 7.8 mm as seen in the original one, check out the pictures). If necessary, the hole for the bowden clip on the top of the extruder should be drilled a bit, just like the other holes in the two halves – no big deal. These two halves, with the bigger nut, are named Base_2 and Top_2. As you can see, the Tops need to be flipped before printing. I suggest printing an additional extruder for backup purposes. If you want to make further edits, I can provide you with the blender file.