<p>I'm having some issues with my Prusa i3 prints. I'm trying to print the default beer opener print that came with the Prusa's memory card but the infill will break causing clogging and now allowing the print to finish. I've attached a picture of one of the failed prints.</p>

<p><a href="https://i.stack.imgur.com/JNPn4.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JNPn4.jpg" alt="enter image description here"></a></p>

<p>I've checked Prusa's website and tried tightening the extruder gears and made sure the gears are clean. I'm using the PLA sent with the printer (1.75&nbsp;mm) and with a default G-code file so I'm fairly sure it is a hardware issue, but I'm not sure what the issue could be. </p>

<p><a href="https://blog.prusaprinters.org/7-problems-affecting-quality-of-3d-prints/" rel="nofollow noreferrer">Here is the link</a> that I've used to help me troubleshoot.</p>

If you carbonize the filament or other particles that are clogging the nozzle, then you will never get them clean. In my experience, it's not worth cleaning the nozzle with anything other than cleaning filament. If that doesn't work then change the nozzle. Heating the metal nozzle with a torch will change the temper of the material. I used to try cleaning with a soldering iron; which was to no avail.
Purchase a dozen brass nozzles and save your self the headache. Either that or a good quality set of stainless steel ones. They are easier to clean with the cleaning filament and aren't ablated by the filament as quickly, allowing for better dimensional accuracy over multiple prints.
https://www.amazon.com/eSUN-CLEANING-Filament-Printers-Cleaning/dp/B00MVIYNFW/