Design Problem: Refill the filament wire (PLA) will not work

K8200 3D Printer K8200 - Assembly and user manual
1

Problem description:

  • My filament wire (PLA) will break apart after every printing is done.
  • If I try to continue printing the next time, there is about 10 cm to print until it reaches the end of the PLA filament wire.
  • If then I try to extend the wire by the wire on the spool by pressing down against the broken wire below within the extruder, it does not work.

Details:

  • I know that the filament wire (PLA) is bent. So within the “printing head” it gets bent within the extruder case which makes it impossible to refill from above with the new wire from the spool.

So it does not push down towards the heating end and I have to stop printing.

How I fixed this problem, but it is not a solution:
Right now I have to push the 2 to 3 cm fileament wire (PLA) which is within the extruder head case with a long wooden stick to try to push it down to the heating head. After that, I can refill with the wire from the spool as usual.

Because my filament wire breaks after every printed part, this is a critical problem.
I need a solution to that problem.

Possible Solutions

  • Prevent the filament wire from breaking apart after every print
  • Provide a guide pipe within the printing head case to make sure if the filament wire is broken, I can refill with a new one without any problem.
  • Any other ideas?

-> See also “Problem: Filament wire breaks apart (PLA)”

2

Yes i had the same problem,
the prints had no problem but when the printer is not in use the filamet will breake betwen spool and extruder.
I think the problem is thad the diameter of the spool is very small and the windings are very close to the spool.
to prevent the break i will lift up the z position to 100mm.

To change filament i will make an clear cut to the old and the new filament

3

Hello,

The filament breaking is due to local humidity and color of PLA (some colors have this problem more than others). When the filament is broken you can also heat up the nozzle and remove the piece of PLA that is stuck in the extruder.

4

Yes, colour is a factor and I find black PLA from Velleman is the worst offender. Grey PLA from Jet is particularly good and sticks well too.

5

Similar experience - Velleman black simply broke (on nearly a full reel) after standing idle for about a week.

Dry or moist… if humidity is the issue, which is it?

Also the black has lost colour.

T

6

I have found that all of the colors from other MFG and Velleman will do that.
Even if I raise the axis to the top

7

When your filament is unwind from the coil, it’s stressed so it “naturally” breaks up, if you don’t want to lose 10cm of PLA each time you finish printing something, just remove it from the extruder.

8

I’d say eventually, because I’ve only experienced it 3 times in two month and only when the printer stayed idle for more than 3 days.