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====== PEI - Polyetherimide ======
Sometimes known as "ULTEM", PEI is most commonly found in 3D printing as the de-facto bed material of choice. For those with machines strong enough to meet the printing requirements, PEI is also a viable filament to print. This amorphous polymer needs no post-processing and provides ready-to-go parts right off of the print sheet.

==== Advantages ====
  * High strength
  * Well-known color and name (cool-factor)
  * No post-processing required (amorphous)
==== Disadvantages ====
  * Cost, availability
  * High temperature requirements
==== Variants ====

Standard guidance on [[filaments:additives|additives]] applies. With the EXCEPTION of colorants as PEI filaments only comes in its natural colors or in the color of the additive it has.

==== Baseline Printing Recommendations ====

Lower temperatures can be made to work but will pit you in a battle against incredibly strong warping from the plastic, both with overall part design as well as from the part warping from the bed.

These numbers are provided as a baseline, and **need** adjustment and calibration for your specific printer/filament/color combination.

^  Variant  ^  Hotend Temperature  ^  Heatbed Temperature  ^  Chamber Temperature  ^ [[filaments:maximum_temperature#optimistic_usable_temperature|Optimistic Usable Temperature]] ^
|PEI  |395C  |?  |?  |200C  |

==== Other notes ====

None.