# Printing Silicone 40A and Alumina 4N on Form 4L **URL:** \ **Category:** General Discussion\ **Created:** [February 23, 2025, 10:59am UTC](https://forum.formlabs.com/t/printing-silicone-40a-and-alumina-4n-on-form-4l/43715 "2025-02-23T10:59:23Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![1738](https://avatars.discourse-cdn.com/v4/letter/1/74df32/32.png) [@1738](https://forum.formlabs.com/u/1738)\ **Post date:** [February 23, 2025, 10:59am UTC](https://forum.formlabs.com/t/printing-silicone-40a-and-alumina-4n-on-form-4l/43715/1 "2025-02-23T10:59:23Z")
We are in the process of choosing the right printer. We need a large build volume and the ability to print silicone. Do I understand correctly that even though its smaller cheaper sibling can print it, Form 4L cannot print silicone? The same question goes for Alumina 4N. If so, why? Are there any plans to open these materials to Form 4L? Feel free to answer in detail, thank you very much for your effort. ---
**Author:** ![cadesewa](https://avatars.discourse-cdn.com/v4/letter/c/77aa72/32.png) [@cadesewa](https://forum.formlabs.com/u/cadesewa)\ **Post date:** [June 2, 2025, 6:27pm UTC](https://forum.formlabs.com/t/printing-silicone-40a-and-alumina-4n-on-form-4l/43715/2 "2025-06-02T18:27:39Z")
Hi there, I am a user, not a trainer. From what I understand during training, the silicone resin is very viscous and when the large platform of the 4L moves up and down, it causes print problems. The trainer mentioned that some customers have made it work, but they had to purchase open material mode and fine-tune it from there. She did not recommend going this route, as she said it’s typically more trouble than it’s worth. I’d imagine the alumina has a similar problem. That’s about as in-depth as my knowledge goes. As mentioned, I am just a user. Hope this helps! ---
**Author:** ![MattRForerunner](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/mattrforerunner/32/20355_2.png) [@MattRForerunner](https://forum.formlabs.com/u/MattRForerunner)\ **Post date:** [June 3, 2025, 12:40am UTC](https://forum.formlabs.com/t/printing-silicone-40a-and-alumina-4n-on-form-4l/43715/3 "2025-06-03T00:40:50Z")
Open Materials are very easy to use once you get tge settings figured out ---
**Author:** ![leonhart88](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/leonhart88/32/19153_2.png) [@leonhart88](https://forum.formlabs.com/u/leonhart88)\ **Post date:** [November 19, 2025, 12:36am UTC](https://forum.formlabs.com/t/printing-silicone-40a-and-alumina-4n-on-form-4l/43715/4 "2025-11-19T00:36:27Z")
Just wondering if anyone here eventually tried silicone on the 4L? ---
**Author:** ![BenCosgriff](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/bencosgriff/32/21759_2.png) [@BenCosgriff](https://forum.formlabs.com/u/BenCosgriff)\ **Post date:** [March 3, 2026, 9:43am UTC](https://forum.formlabs.com/t/printing-silicone-40a-and-alumina-4n-on-form-4l/43715/5 "2026-03-03T09:43:23Z")
Yeah, though only for small parts, however I was able to print full plates of them without issue. I would imagine you get more design flexibility on the Form 4 though, ie the cable section of a strain relief design I tried had a fairly short max length before the cross braces would start to tear during printing. ---
**Author:** ![leonhart88](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/leonhart88/32/19153_2.png) [@leonhart88](https://forum.formlabs.com/u/leonhart88)\ **Post date:** [March 3, 2026, 4:10pm UTC](https://forum.formlabs.com/t/printing-silicone-40a-and-alumina-4n-on-form-4l/43715/6 "2026-03-03T16:10:16Z")
I’ve got it working quite well now…will post a video about it in the future! ---
**Author:** ![leonhart88](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/leonhart88/32/19153_2.png) [@leonhart88](https://forum.formlabs.com/u/leonhart88)\ **Post date:** [August 18, 2026, 5:34pm UTC](https://forum.formlabs.com/t/printing-silicone-40a-and-alumina-4n-on-form-4l/43715/7 "2026-08-18T17:34:09Z")
Still working on the video, but for now we have our 4L print setting on our store that you can purchase.