One question many people ask before buying a cutter is whether this tool is really indispensable or whether they will end up using only one stitch, such as zig-zag.

Rifinisci come una professionista
We mentioned the brand Necchi in the title since the question has been asked several times in reference to this specific brand, but the argument applies similarly to any type of overlocker.

After how long to buy an overlocker?
If you are very new to the world of sewing machines, we recommend that you allow at least a few months to pass before buying a sewing machine. As a rule, one year of practice on a traditional machine should be more than enough time to upgrade to a machine that allows for superior functions, but of course this also depends on individual needs and frequency of use. In case you use the sewing machine quite frequently, even a few months might in fact be enough!
What are you getting into?
Those who are approaching a cutting and sewing machine for the first time will have to prepare themselves for some minor difficulties, which will be easily overcome with a little training. However, it is necessary to premise that the small initial difficulties will be more than repaid by the advantages of using this type of sewing machine.
Il primo ostacolo che tutti affrontano è infilare la tagliacuce. Tenete presente che dovrete infilare (almeno) 3 fili, e che questo processo necessita della massima attenzione. Tuttavia le macchine più moderne o con le maggiori funzionalità sono meno difficili da infilare. Per tutti i modelli, consigliamo di provare la macchina su un pezzo di stoffa di scarto, e di procedere all’infilatura più e più volte prima di passare a realizzare progetti veri e propri.
But is it really needed? How much should be spent?
The question on everyone's mind is whether a cutter is really needed. If you make a large amount of clothing or home textiles, and if you perhaps wish to sell or donate them, the answer is certainly yes. The answer is actually yes even in cases where you do not use the sewing machine often, but wish to shorten the time that tedious operations such as cutting or sewing with stitches such as zig-zag require. Consequently, we cannot give an answer that really applies to everyone: the need also depends to a large extent on personal needs and desires.

The expense chapter also clearly depends on personal needs. Although many used cutters can be found on the market, buying a new one will allow you to take advantage of the warranty, and also give you a model that is more up-to-date and probably easier to use. For the first machine you might opt for a fairly simple model and upgrade to a more complex (and expensive) one later.
If you are still in doubt about buying it, ask someone who already owns it to give it a try or again, rent one for a week. This will give you a chance to see if the machine would be useful for your needs. In case of difficulties however, we urge you not to give up, because the small initial efforts will be repaid shortly by the potential of this type of sewing machine.