Printing great-looking miniatures with a 0.25mm nozzle (not only) on the Original Prusa MINI

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Our new Original Prusa MINI 3D printer may be small, but it’s capable of doing some great things. And tiny things, too! Miniatures for tabletop games present a good challenge. These figures are small and richly detailed, so many users prefer to get an SLA 3D printer. However, it’s possible to produce incredibly convincing results even with the stock MINI – with one tiny addition: a 0.25mm nozzle. So let’s take a look at how you can spice up your next Dungeons and Dragons session!

In other words: what we’re looking at here is the general idea of producing tiny figures or tabletop game accessories on hobby-grade 3D printers. Characters usually come in two sizes – 28 and 32 mm (more about this later), which is just a hair over one inch – pretty small then. Luckily, there are some tricks which will help you to produce great-looking results. Needless to say, this process will also work with the MK3S/MK2.5S 3D printers. There are downsides, though. Be prepared for long prints – one figure can take up to 2-3 hours depending on the size and volume of supports.

Swap the nozzle!

Swapping the nozzle is the first key task on the list. The nozzle on the MINI is easily accessible and replacing the default 0.4mm one with a 0.25mm model takes roughly two minutes and will set you back about 12 USD. The process is described in detail in the handbook, so here’s just a quick recap.

You will need:

16mm spanner or adjustable wrench (a good set of pliers is an option, too) 7mm socket wrench (or a second set of pliers) E3D-compatible 0.25mm nozzle

The process is simple and doesn’t take long:

Preheat the nozzle to 280 °C (Settings – Temperature – Nozzle) Unload filament (if present) Move the Z-axis to the top Hold the heater block with the spanner/wrench Use the 7mm socket wrench to unscrew the nozzle – WARNING: BOTH THE SOCKET WRENCH AND THE NOZZLE ARE EXTREMELY HOT!! Put the nozzle in a safe location. Do not touch the socket wrench! Carefully insert the 0.25mm nozzle and tighten it gently but firmly. Don’t use excessive force!

The final step is adding the corresponding profile in PrusaSlicer. Go to Configuration – Configuration Wizard – Prusa FFF and tick 0.25 mm nozzle. Don’t forget to switch to the correct printer model in the menu on the right – it should say Original Prusa MINI 0.25 nozzle.

We have covered various nozzle diameters in great detail in an older article

Before we get to slicing, it’s important to select the right material first. It might come as a surprise to you, but we achieved really good results with ASA. Let’s take a closer look!

Choosing the right materials

The most common go-to material when it comes to 3D printing is PLA. It’s widely available in many colors, doesn’t require any special approach, and is generally easy to work with. The amount of details on the models is very good, but there’s a catch: depending on the selected color/brand of filament, the number of details you perceive may vary. This is due to the fact that various materials have different properties – e.g. transparency, translucency, glossiness, some materials have additives (such as glitter in PLA

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