Prusa Research i3 MK2.5, Handbook

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7.3 Printer addons
7.3.1 Different nozzles
You have to use proper preset settings for different nozzles in Slic3r or
PrusaControl.
Please, check out how to change the nozzle in section
​
12.6 Replacing / changing the
nozzle.
7.3.1.1 Hardened steel nozzle by E3D
E3D, a UK-based company, that supplies hotends for the Original Prusa i3 MK2.5, has a
whole ecosystem of upgrades and addons. We support some of them including the
hardened steel nozzle.
Hardened steel nozzles are a must for
​
highly abrasive materials
​
. Regular brass nozzles
will degrade very quickly and lose their properties.
Most of the abrasive materials are composites, plastics with additives. Some examples are
ColorFabb XT CF20, ColorFabb Bronzefill, ColorFabb Brassfill and some glow-in-the-dark
filaments. Always ask your filament vendor if you are not sure. A slight disadvantage is that
some standard materials like ABS are not able to be printed as fast as with a regular nozzle.
7.3.1.2 The Olsson Ruby nozzle
Similarly to hardened steel nozzle, the Olsson Ruby is designed to print highly abrasive
materials. However, since most of it is made from brass, it retains the excellent heat
conductivity and throughput of the stock brass nozzle. Even though the ruby gemstone is
highly wear resistant, it’s also brittle. If you have your Live Z adjust set incorrectly (extremely
low - big negative number) or if you misalign your P.I.N.D.A. probe and the nozzle hits the
removable steel sheet, it may crack. Do not overtighten the nozzle (1 Nm max).
7.3.1.3 0.25 nozzle by E3D
E3D, a UK-based company, that supplies hotends for the Original Prusa i3 MK2.5, has a
whole ecosystem of upgrades and addons. We support some of them including the 0.25
nozzle.
To get finer detail on 0.1mm or 0.05mm print settings, you can use a 0.25mm nozzle. But
use it for only very small objects, e.g. a few centimeters in size. The print time can be
considerably longer compared to 0.4mm. The ideal use is for jewelry.
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