<p>Related to an issue I had in <a href="https://3dprinting.stackexchange.com/questions/1205/increased-issues-with-filament-grinding">this question</a>, where the PTFE tube feeding my filament to the metal tip of the extruder clogged and became discolored: what are the advantages and disadvantages of changing out my extruder (Mk10 on a FlashForge Creator X) for an all-metal solution like the one advertised <a href="https://store.micro-swiss.com/products/micro-swiss-mk10-all-metal-hotend-kit" rel="noreferrer">here (by Micro-Swiss)</a>. </p>

<p>I understand that the conversion would allow me to print higher-temperature materials (like nylon), but I'm also trying to figure out the trade-offs with regard to printing PLA/ABS parts. </p>

In general, metal extruder without PTFE feeding is useful when printing with materials that require high temperature to melt: 300
o
C and above.
Polycarbonate
with recommended printing temperature at up to 310
o
C is a good example.
PTFE melting point is around 320
o
C, but it may become soft at much lower temperatures, according to RepRap wiki:
http://reprap.org/wiki/PTFE
From the other hand, all-metal extruder lacks advantages that PTFE ones can provide, the most important of them is the ability to have longer retracts without risk of clogging the filament tract.
This is mostly important for users with Bowden-type extruders as well as for printing with soft or stringy filaments.