Custom printing · MARC guide
How to Send MARC a Useful Custom 3D-Print Brief
Published 30 September 2026
Know what to share with MARC when you have a ready 3D file, a sketch or just an idea, and what happens before production.
The short answer
You can start with a ready 3D file or describe an idea with a photo or sketch. Tell MARC the desired size, quantity, use, material or finish preference and any deadline. A custom request begins a review and quote conversation; it does not automatically start production.
If you already have a file
The MARC custom-request form currently accepts STL, 3MF, STEP/STP and OBJ 3D files, plus SVG, PDF, PNG, JPG and WebP references, up to 10 MB per attachment. Uploading a file does not confirm that it is ready to manufacture; the team reviews the model, material and brief before agreeing on production.
State the intended final size and quantity even when the model appears to contain measurements. Mention any important fit, assembly or finish requirement in the request text.
If you have an idea or a reference
A clear description can be enough to begin. Explain what the object should do, where it will be used and what part of the reference matters most. A sketch or photograph can help communicate the form, but tell MARC which details may change and which cannot.
The form asks for a size estimate, quantity and contact details. You can suggest material and colour or ask for help choosing them. Budget range and needed-by date are optional, but giving them can make the first reply more useful.
What happens after you send it
MARC's published custom workflow is: share the starting point, discuss design/material/quote, approve the piece, then proceed to production and dispatch. A custom request is an enquiry, not an instant checkout or a promise of a particular material, delivery date or final price.
If the piece must hold another object or fit a space, include that object's measurements. If it is a gift or a business order, mention the number of pieces and any packaging or timing constraints so MARC can respond to the actual brief.