What is an FEP Film 3D Printer?

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Updated February 3, 2023

If you are new to the world of physical printing, you may wonder what is an FEP film 3D printer. Some of the best printers, after all, are 3D printers. FEP printing is a popular subtype that uses Fluorinated Ethylene Propylene film on the bottom of the resin vat to create a tight seal. So let’s dive deeper into what exactly is FEP film printing and the advantages of this printing method.


  • Any resin vat requires a layer of protective film on the bottom to create an airtight seal for the liquid resin.
  • A popular choice for modern resin-based printers is FEP film, which stands for Fluorinated Ethylene Propylene.
  • FEP film and NFEP film are known for being really strong, transparent, and resistant to corrosive chemicals such as Anycubic photon particles.

Before learning how to level a 3D printer bed or learn about subtypes, it is helpful to understand the basic concepts at work. These printers build objects out of raw materials, even if you are still learning what FDM 3D printing is. They extrude the materials via nozzles and slowly build objects on the print bed, which is helpful to know when learning the definition of FFF 3D printing.

Insider Tip

Most resin tanks already feature a layer of protective film, which should last throughout the lifetime of the liquid resin.

Beyond that, there are many variables that change from printer to printer, leading many to wonder what size feeler gauge is appropriate for 3D printers.

What is FEP 3D Printing?

All resin printers include a layer of protective film at the bottom of the resin tank. This film not only helps protect the resin from the elements, but it also keeps the vat airtight and allows crucial UV light to easily access the resin when making prints. There are many types of these films available to resin-based printers, and FEP, which stands for Fluorinated Ethylene Propylene, is one such type of protective film. This copolymer of hexafluoropropylene and tetrafluoroethylene was invented by DuPont and is sold under the brand name Teflon FEP.

Benefits of Using FEP Film Printers

Many modern resin printers have begun adopting FEP film as a primary choice when instituting a protective layer for the resin. Here is why.


By far, the best feature of FEP is its strength. When you slap a layer of this film at the bottom of a liquid resin tank, it is not going anywhere, and it takes a whole lot to break its airtight seal. This allows it to basically be a “set it and forget it” type of deal.

Chemical Resistance

FEP resists the corrosive properties of many chemicals that regularly come into contact with resin tanks, further upping the protective abilities.

STAT: In terms of material, many desktop resin printers use FEP (Fluorinated Ethylene Propylene) films, a material known for their good chemical resistance and non-stick properties. (source)


These films need to be transparent to allow UV light in when making elaborate prints. FEP film is highly transparent.

FEP 3D Printers FAQs

What do I look for when buying a resin vat?

When purchasing a resin vat, look for a high-grade Anycubic photon-based film on the bottom to help maintain an airtight seal.

When and how often should you replace your FEP film?

Only replace the film if there are deep scratches or if you suspect air particles are getting into the tank. Otherwise, the film should be good to go, no matter if you live in the Virgin Islands, Caicos Islands, Cayman Islands, Falkland Islands, Solomon Islands, or the good ole USA.

How do I tighten my film?

This requires tightening the resin 3D printing screws on the bottom of the tank of FEP film or NFEP film. Work slowly and carefully until adequately tightened.
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