Min thread diameter
The smallest diameter of polymer thread with which the pen can operate effectively; with a smaller thickness, the device will not be able to properly pass the material through the feeder. Usually, this diameter also corresponds to the regular thread diameter the device is designed for.
The most popular option for modern 3D pens is 1.75 mm; occasionally other values barely found — for example, some "heavyweight" high-performance models are designed for 3 mm threads.
Nozzle Diameter
The diameter of the nozzle provided in the pen.
The larger the nozzle, the thicker the lines produced by the pen will be (ceteris paribus; the actual thickness of the lines will also depend on the type of plastic and the adjusted temperature). In the thinnest models, the nozzle diameter is less than 0.5 mm, in the thickest models it is about 0.9 mm. Most modern 3D pens have nozzles in the range of 0.6 – 0.7 mm — this value is considered the most versatile and convenient for practical use.
Print Speed
The material feed rate provided by the pen. The higher this speed, the faster you can work with this model; on the other hand, the rapid supply of material requires increased accuracy and serious skills. The maximum value of this parameter in modern 3D pens is about 40 mm/s. Models with adjusted speed is also available (see below); for them, usually, the highest speed of operation is given in the specs.
Temperature Adjust
Possibility
to adjust the heating temperature of the pen with a "hot" type of operation (see "Product Type").
Most devices with this feature capable of working with different types of plastic — both ABS and PLA (see "Filament Material"). These types of plastics have different softening temperatures, and temperature adjustment is used in order to adjust the pen to a specific material. However, this function can also be found in models designed for one type of plastic. In such cases, adjusting the temperature allows you to prepare the device for threads of different thicknesses (the thicker the thread, the more intense the heating should be), as well as change the fluidity of the material (the higher the temperature, the more liquid the plastic coming out of the nozzle).
Smooth Speed Adjust
The ability to smoothly change the feed rate of the material. The speed adjust allows you to set the mode of operation of the pen to the circumstances: for example, a low speed will be convenient for fine work, and a high speed is so for large elements. Specifically, the smooth speed adjust is convenient because it allows you to select almost any speed in the range from minimum to maximum.
In addition to this type, there is also a step adjustment, for more details, see “Number of Speeds”.
USB powered
The pen is powered by a standard USB connector. Such devices are as versatile as possible in connectivity: they can be powered via a PC, a portable device like a laptop or tablet, an external power bank, a USB wall charger or car charger.
Auto Power Off
Automatic power off of the pen for being idle for a while. Usually, auto-off triggers after a few minutes.
This feature is found mainly in models with a "hot" type of operation (see "Product Type"). It saves energy and reduces the risk of getting burned by accidentally touching the pen that is left on. However, there are also "cold" models with auto-off.
Display
The availability of a
built-in display. Usually, these are the simplest single-colour screens that display the basic operating parameters — speed and/or temperature. However, even such a display makes the pen more convenient and allows you to get important information about its operation.
Country of brand origin
The country of origin indicated in the specifications of the device. Note that this is far from necessarily the place of actual manufacturing: frequently the “homeland” of the brand or the location of the manufacturer’s HQ is indicated as the country of origin of products. Additionally, giving the importance to this parameter, it should be taken into account that many “national” stereotypes are unfounded: in the modern world, the quality of a product depends not so much on its country of origin, but on the price category and the overall reputation of the manufacturer. So, paying attention to the country of origin makes sense only if you fundamentally want (or do not want) to support a brand from a certain country.
