Snapped Filament

The Problem

Nothing comes out of the nozzle, but you can see it’s full w'hen you look at the filament spool and the feed tube seems to have some filament in it too. Bow'den

feed printers are unique to this problem; it is not usually found in direct feeds. That is because normally the filament is covered, so that you can’t see it immediately (Figure 8.12).

The Cause

This problem can be caused by different factors but the most common one is cheap or old filament. Although it’s true that most ABS and PLA filaments have a long lifetime, if held in bad weather, they may become brittle, once they go wrong, then when they are fed to the printer, no amount of change will make them right.

The Solution

i. Try to make use of another filament. If you find the same problem after the filament has been reloaded, try using another script. This would let you know if the brittle filament is actually causing the problem.

ii. Check the temperature and flow rate of your printer. This simply means that if the problem persists, check to see if the hot-end is at the right temperature and gets as hot as per suitable range. You should also check to see if the flow rate of the filament is no more than 100%.

Getting Cracks in Tall Objects

The Problem

You get cracks on the sides of your models, particularly when you’re making taller models. This is considered to be one of the most surprising problems that can be experienced in 3D printing. That is because it usually appears in bigger prints, which typically happens while you’re not looking (Figure 8.13).

The Cause

The reason for this problem is that the materials cool down faster in the higher layers of your print. The heat produced by the printing bed does not reach the upper pieces, making the upper layers less adhesive.

The Solution

Increase the extruder temperature by 10°C. Take a look at the side of the filament’s box, you’ll find the recommended temperatures for the hot-end. Try to keep your 3D printer’s temperature setting within these values.

 
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