Overview

The OpenCAL resin is a UDMA-based photopolymer tuned for Computed Axial Lithography. For most users, there is no need to mix the resin yourself; it is being produced and distributed commercially so you can buy it ready to print.

  • Formlabs mixes and manufactures the resin to the OpenCAL formulation.

  • MatterHackers distributes the finished resin, making it easy to purchase.

This means you can get consistent, professionally produced resin without handling the raw chemistry. Buying the pre-mixed resin is strongly recommended.

Warning

Resin handling — important. Photopolymer resin cures when exposed to light:

  • Always wear nitrile gloves when handling resin or uncured (wet) parts.

  • Never expose the resin to natural sunlight. Sunlight (and other strong UV / blue light) causes rapid, uncontrolled curing that will ruin the resin and can solidify it in its container. Keep it away from windows, work under subdued ambient room light, and keep containers capped whenever they are not in use.

  • Store the resin in a cool, dark place, and follow its Safety Data Sheet (SDS).

Note

Mixing the resin from raw chemicals is only for trained professionals working in a laboratory. If that applies to you, see the Lab Directions (Experts Only) page for the full recipe and procedure.