# Printing with Form 3+ out of high hardness material like permanent crown **URL:** \ **Category:** Tutorials\ **Created:** [November 29, 2023, 6:59pm UTC](https://forum.formlabs.com/t/printing-with-form-3-out-of-high-hardness-material-like-permanent-crown/37359 "2023-11-29T18:59:59Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![ddiegel14](https://avatars.discourse-cdn.com/v4/letter/d/839c29/32.png) [@ddiegel14](https://forum.formlabs.com/u/ddiegel14)\ **Post date:** [November 29, 2023, 6:59pm UTC](https://forum.formlabs.com/t/printing-with-form-3-out-of-high-hardness-material-like-permanent-crown/37359/1 "2023-11-29T18:59:59Z")
I am attempting to replicate a old stone arrow head for practical use. Although it would be possible to do this with the Alumina 4N I would like to try it with a more cost effective process and material. I have a 3+ and was wondering if I can print the permanent crown material or something similar on the 3+ that would have extremely high hardness and be able to be polished and machined like this material? Is there an engineering grade of this material available for the Form 3+? ---
**Author:** ![Jesse\_K](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/jesse_k/32/18872_2.png) [@Jesse\_K](https://forum.formlabs.com/u/Jesse_K)\ **Post date:** [November 29, 2023, 10:27pm UTC](https://forum.formlabs.com/t/printing-with-form-3-out-of-high-hardness-material-like-permanent-crown/37359/2 "2023-11-29T22:27:47Z")
Hi @ddiegel14, Thanks for reaching out! Permanent Crown Resin is only compatible with the Form 3B(+). With that said, you may have success with other resins such as Rigid 10K for example. You can check our [Material selector](https://formlabs.com/material-selector/) for more suggestions. ---
**Author:** ![ddiegel14](https://avatars.discourse-cdn.com/v4/letter/d/839c29/32.png) [@ddiegel14](https://forum.formlabs.com/u/ddiegel14)\ **Post date:** [November 30, 2023, 2:40pm UTC](https://forum.formlabs.com/t/printing-with-form-3-out-of-high-hardness-material-like-permanent-crown/37359/3 "2023-11-30T14:40:25Z")
Would the rigid 10k have the same hardness and impact resistance as the permanent crowns? I did not see a hardness test data on either of these. Our product will be trialed for actual use and the hardness and impact resistance is critical to the function. I would say it needs to be just as hard as the temporary crown to survive the use case. ---
**Author:** ![Jesse\_K](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/jesse_k/32/18872_2.png) [@Jesse\_K](https://forum.formlabs.com/u/Jesse_K)\ **Post date:** [November 30, 2023, 10:01pm UTC](https://forum.formlabs.com/t/printing-with-form-3-out-of-high-hardness-material-like-permanent-crown/37359/4 "2023-11-30T22:01:58Z")
You can compare material properties of these resins via their datasheets: - [Rigid 10K](https://formlabs-media.formlabs.com/datasheets/2001479-TDS-ENUS-0.pdf) - [Permanent Crown](https://formlabs-media.formlabs.com/datasheets/2002482-TDS-ENUS-0.pdf) If you’d like a more hands-on sense for this, you can [Request a sample part](https://formlabs.com/request-sample-part/) or reach out to [sales@formlabs.com](mailto:sales@formlabs.com) to submit a custom sample part request. ---
**Author:** ![warnersmith323](https://avatars.discourse-cdn.com/v4/letter/w/df705f/32.png) [@warnersmith323](https://forum.formlabs.com/u/warnersmith323)\ **Post date:** [December 13, 2023, 4:42am UTC](https://forum.formlabs.com/t/printing-with-form-3-out-of-high-hardness-material-like-permanent-crown/37359/5 "2023-12-13T04:42:46Z")
The Permanent Crown Resin available for the Form 3+ is not the best choice for replicating an old stone arrowhead for practical use. While it boasts high hardness and polishability, it lacks the structural integrity and wear resistance required for a functional arrowhead. It’s primarily designed for dental restorations, not tools or weapons.