Limited experiences with nozzles and wear

After printing hundreds of kilograms of filament through several printers and consequently destroying dozens on nozzles along the way; I have probably learned nothing, but let's take a look anyway!

Cheap brass nozzles

• These can be found in a 10 pack for around $20 USD including shipping to the door
  • At least 5 are completely usable out of the box
  • Usually a couple more can be made functional with some cleanup and deburring
  • Never had a complete batch that were all usable out of the box (No threads on one)
• For this price, it is an acceptable choice for those willing to tinker, replace nozzles more often, and get less overall reliable quality
  • Had more than one break out the nozzle tip after some long PLA prints (turns into 1.75mm nozzle)
• Occasionally seen warping or crumbling brass after torching nozzles to burn out a clog
• These WILL work in a pinch so I used to keep a handful for emergencies
• Brass nozzles in general, have the best print quality and reliability across all materials they can be used for (no abrasive materials)

Cheap "Hardened" nozzles

• Cost is similar to a good brass nozzle at ~$5 USD
• Inconsistent internal geometry due to poor machining or dull tools
• Nozzle out of round leading to over/under extrusion in complex parts
  
• Depending upon the material used to create the nozzle, all nozzle temperatures will need to be raised by 5-20 C
  • Hardened steel has a bit better heat conductivity compared to most stainless steels
• These CAN work for abrasive materials but they require luck and/or patience to get good results over time
• Unfortunately, sometimes unhardened stainless steel nozzles are sold as "Hardened" nozzles

E3D brass v.6 nozzles

• These seem reasonably priced to me at around $5 USD so I now keep a handful of these around instead
• When I want a brass nozzle for highest print quality, this one has great tolerances and longevity (for brass)
• Tolerates being torched out after a clog now and then without issues
• Brass nozzles in general, have the best print quality and reliability across all materials they can be used for (no abrasive materials)

E3D Hardened Steel and Nozzle X coated v.6 nozzles

• These are quite affordable for Wear Resistant nozzles at around $20 to $30 USD
• Raise all nozzle temperatures 5-10 C to accommodate it's low thermal conductivity compared to brass
• Wear resistant nozzles are REQUIRED to print abrasive materials such as composites (Carbon/Glass Fiber, Glow-In-The-Dark, Sparkles, Wood, Stone, etc.)

Everything else I haven't tried yet

Any opinions I have on other nozzles are based purely upon the evil marketing strategies of 3D printer nozzle manufacturers

• Low thermal conductivity makes sense (to me) as a real limitation to quality etc. in wear resistant nozzles
  • Makers of the DiamondBack nozzle claim it has a thermal conductivity comparable to brass, with wear resistance close to raw diamond