Why do my Dymo labelmaker labels keep falling off?
A common mistake when purchasing a label maker is to just buy the cheapest one available and assume it will do the job.
In fact the better way is to decide what you want to label, then find out which are the best types of label for that application, then find a label machine that can print those labels.
For example the Letratag range are low end consumer labels designed for smooth, clean, flat surfaces, while the Dymo D1 (Labelmanager) range is designed more for the office environment - but again they're still designed for smooth flat surfaces (though the D1 range does include a flexi nylon tape, and a tape with stronger adhesive).
So if you try to attach these labels to curved surfaces it's likely they will come unstuck at some point. Many label materials actually resist curving and therefore actively work against the adhesive, resulting in them eventually falling off.
So if you are planning to label rough, dirty, oily, curved or otherwise non-flat/smooth/clean surfaces - especially cables - then you should look for the best label to do the job, and then pick a labelmaker from the same range.
For cable labelling you should really be looking at the Dymo RhinoPRO range of labels, some of which are designed specifically for such highly curved surfaces.