While these features would make life easy for you, machine providing these features will also cost more than their counterparts.
Variable Speed Option
Some parts of the fabric – such as their corners – require more precision and slower speed than the others – like its central body. Having a variable speed option would allow you to easily adjust the speed of your machine. Otherwise, you might have to manually tone it down.
Automatic Thread Tension
This feature is a must-have if you want an embroidery machine for professional use. By taking the thickness of the fabric in consideration, it automatically adjusts the thread tension to provide your designs a constant flow. Machines with automatic thread tension have fewer thread breaks and are less prone to puckering.
Automatic Thread Trimming
No embroider loves trimming all their threads by hand, and it is safe to assume that you aren’t different. Machines with the thread trimming feature clip all your threads automatically, hence saving you time and effort.
Automatic Needle Threader
While some machines offer an automatic needle threader, others provide a magnifier to make the job easy. Once again, this feature is not compulsory, but it would make your work easy.
Want to make your designs unique? One way to do that is having a machine which allows you to curve your fonts, hence making them Archable. You could also combine Archable fonts with other designs of yours to give them a layer of uniqueness.
Looking to add some sequins or beadings to your design to make it look stand out? Embroidery machines which offer embellishment capability allow the same.
How much embroidery speed you may need depends on your experience in the field. Measured in stitches per minute (SPM), an embroidery speed of 750 SPM is more than enough for beginners, whereas a 1200 SPM is generally recommended for professionals.
If your embroidery machine has a safety feature, it will operate in one of these two ways when its bobbin thread is about to run out. Either it will turn off the machine or it will notify you in advance. Regardless of its operating mechanism, a safety feature is a must-have if you want your design to be consistent.