PLA and PLA+
PLA
PLA has been the standard since e-NABLE began. It is the easiest to thermoform. All but a small amount of filament used on e-NABLE devices is PLA.
The glass transition temperature of PLA is usually between 55 to 60 °C, according to ScienceDirect. That’s why you should be printing PLA at a bed temperature around that mark - to help the first layer stick better to the bed.
Also, keep PLA’s very low glass transition temperature in mind when choosing it or other materials for certain parts. As MatterHackers points out, leaving a PLA part on your car dashboard on a hot summer day could significantly deform the part. In equatorial locations it would not do well.
PLA+
PLA+ has a glass transition temperature similar to PLA. Just like PLA, you should be printing with a bed temperature value around the glass transition temperature.