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Large-format 3D printing, made in Honolulu

Min Plastics & Supply in Iwilei, Honolulu, is adding large-format 3D printing for plastic parts up to 8 ft x 4 ft and 8 ft tall.

Big, complex plastic parts without the mold. Our large-format printing cell will be online at the end of 2026 and taking orders as soon as January 2027.

Large-format 3D printed car body parts on display at an industry trade show
Large-format printing seen at a 2025 industry trade show. Not an MPS project.

The problem

A desktop printer can’t make a part this big. A mold or tooling for one custom piece costs a lot of time and money, and shipping a large part to the islands adds more.

How we help

We’ve cut, formed and finished plastic in Iwilei since 1950. Our large-format cell prints parts bigger than 2 ft x 2 ft x 2 ft, then we finish them in the same shop. A six-axis robotic arm moves the extruder in multiple planes, so complex shapes come out in one piece.

What it's good for

  • One-offs and low volumes with complex shapes.
  • Custom display pieces, such as large lawn or lobby pieces.
  • Small boat hulls and marine parts.
  • Molds, patterns and fixtures for boat builders and others.
  • Architectural pieces and large prototypes.

Not sure if printing is right for your part? Simple parts from sheet or panels are often better made another way, and we’ll tell you. Printing shines on complex shapes in low volumes, and on large parts a desktop printer can’t make. Compare your options in our guide: Large-format 3D printing vs other methods.

Large-format 3D printed lounge chairs and table base at an industry trade show
Large-format printing seen at a 2025 industry trade show. Not an MPS project.
Concept illustration of a large curved display counter made of 3D printed plastic with visible layer lines.
Custom display piece
Concept illustration. Not an MPS project.
Concept illustration of a boat helm console with a clear windshield, made of 3D printed plastic.
Marine part
Concept illustration. Not an MPS project.
Concept illustration of a lounge chair and ottoman made of 3D printed plastic with visible layer lines.
Custom furniture
Concept illustration. Not an MPS project.
Large-format printing cell in the MPS shop in Iwilei, Honolulu.

How it works

  1. Send us your part or idea. STEP files work, and we can help with the design.
  2. We review it with you and check visual edits before production starts.
  3. We print it.
  4. We finish it: machined smooth or milled to a final surface, and painted or polished where the material allows.
Large-format 3D printed faceted counter at an industry trade show
Large-format printing seen at a 2025 industry trade show. Not an MPS project.

FAQ

Up to 8 ft x 4 ft and 8 ft tall. Larger work is printed in sections and welded together.

PETG, HDPE and polypropylene, compared in our materials guide. The reinforced grades are fiber reinforced and stronger than unfilled plastic, and the reinforced PETG, polypropylene and HDPE are UV stabilized for sun and outdoor use. We also offer a clear PETG.

HDPE and polypropylene suit parts that will be submerged or used in a marine setting. PETG is economical and a good all-rounder, indoors and outdoors. Tell us where the part will live and we’ll match it.

They’re made from recycled feedstock and can be recycled again at end of life. Our stock materials don’t carry a fire rating, but a fire-rated material can be added for your project.

White matte and clear glossy PETG, light grey-green HDPE, and white matte polypropylene.

Layered lines, from about 1/16 in to 3/8 in. We can leave them as part of the look or mill the outside for a smooth finished surface.

About plus or minus 1/32 in once milled, and about plus or minus 1/8 in as printed.

PETG and polypropylene can be painted and polished. HDPE isn’t made to hold paint, but flame treatment helps paint stick.

Yes, and we plan around the conditions it will see. Heat above a material’s service temperature can affect any plastic part, so tell us where it will be used.

Yes. Come to our showroom and we can show you samples and the process.

You can review visual edits before production starts. After production starts, changes may be possible through a change order.

Online at the end of 2026 and taking orders as soon as January 2027.

MPS team member reviewing a part drawing on a computer in the Iwilei shop.

Get in touch

Send us your measurements or files on our Contact Us page. You can attach files. Prefer to talk it through? Call our office and speak with a friendly, helpful representative, or visit our showroom.