Top of models not printing
I am new to 3d printing just built a prusa mk3 last week still learning. I had some really good prints going until filament broke inside tube. I had to take apart the whole heat sink to get at it but not the nozzle. I believe I put it back together correctly. I used a wire brush on my drill to clean the tip maybe I hurt it but the first layer looks great. Any ideas what’s going on???
RE: Top of models not printing
Seems the filament always needs to be unloaded and loaded again to get it working again. But nozzle is not clogged. The filament gear screw is flush but seems to skip it does have marks on the filament when I unload it.
Also flat prints seem to work fine??
RE: Top of models not printing
I have the same issue, with three different printers mk3s at the same time. I am still trying to isolate the issue to no avail.
RE: Top of models not printing
When you unload the filament, examine the tip. If there is a stub, and that stub is 2.2 mm diameter, you are probably experiencing heat break jams. Here's an example of what 2.2 mm stubs look like. Left is the melt end and stub, right side is where I clipped it off the spool.
And another user's experience of the same problem: melt is on the right in this image.
RE: Top of models not printing
ps: a steel wire brush is probably damaging the brass nozzle. A brass brush is better, though if not careful will also damage the nozzle bore. Cardboard works fairly well on a hot nozzle. I use a paper towel most the time.