Updated 3 weeks ago ​by Tomáš Chvalina

Flex is a very strong and flexible material. There are many use cases where hard plastic is not the ideal or even unusable at all. But whether you need a phone cover, an action camera case or wheels for your RC car, flexible is the way to go.

Before you start printing from Flex, clean the nozzle from the previous material - preheat the nozzle and load PLA to remove any other previous material. When loading Flex, loosen the extruder (idler) screws. Keep in mind that when printing from Flex, the automatic filament change function may not work properly.

Flex has very good abrasion resistance, remains flexible in cold environments, and is resistant to many solvents. It doesn’t shrink much when cooling down, so you can be fairly accurate with your measurements and perfect fit models.

Flexible and elasticNeeds more steps when loading
Little shrinkingCan be tricky to print
Good layer adhesionNeeds to be printed slowly

Nozzle temperature: 230°C
Bed temperature: 50°C - 65°C (Depending on the size of the object, bigger objects tend to need higher bed temperature.)
Heatbed: Make sure the surface is clean as described in PEI print surface preparation. Some very soft flex materials can bond to the bed too much and require use of glue on the bed as a separator to prevent PEI damage.

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