Compact Machines Preview Fixer in FTB StoneBlock 4
FTB StoneBlock 4 1.23.0 ships version 21.1-1.1.0 · First seen in 1.14.0
Compact Machines Preview Fixer is a mod in FTB StoneBlock 4 1.23.0, where it is version 21.1-1.1.0. Fixes the severe memory leak when previewing Compact Machines rooms. Opening a preview can chew through hundreds of MB to multiple GB of RAM that never gets freed, eventually crashing the game. This client side mod cleans that up. (Summary from the mod's Modrinth page.)
Compact Machines Preview Fixer guide for FTB StoneBlock 4
Last verified for FTB StoneBlock 4 v1.23.0 on Oct 13, 2026 · text last changed Oct 13, 2026
Also applies to:FTB Skies 2 1.17.0 to 1.24.0FTB Skies 2: Aero 1.0.3 to 1.10.0
- Sections
- 1
None of these sections are written for this pack; 1 is shared from another pack's guide.
Every recipe and number here was checked against FTB StoneBlock 4 1.23.0, read from the running game on Oct 13, 2026.
What is Compact Machines Preview Fixer?
Same as in the FTB Skies 2 1.22.0 guide
This pack ships Compact Machines Preview Fixer at version 21.1-1.1.0, in the file cmpreviewfixer-21.1-1.1.0.jar. It was first included in this pack's 1.22.0 release or an earlier one.[1]
Unverified I can't confirm from the available sources what this mod changes in the game, who it is aimed at, or whether it has any config options. Going by the name, it relates to Compact Machines previews, but that is unverified.
Unverified The sources give no information about where the mod fits in the pack's progression, so I'm not making any claims about when you'd use it or whether it's tied to the ATM Star path.
Sources
- FTB Skies 2 1.22.0 mod list · pack file
Where this guide comes from
Written from what FTB StoneBlock 4 itself ships: its files and recipes, the in-game guidebooks and the mods' own pages. Every statement links to the source it came from, and the numbers are checked against the pack before publishing.
Guide last verified Oct 13, 2026.
Report wrong info
Version in each release
18 releases, first in 1.14.0
| FTB StoneBlock 4 | Version | Jar | Where it came from |
|---|---|---|---|
| 1.23.0 Oct 12, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.22.0 Sep 22, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.21.0 Sep 9, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.20.1 Sep 1, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.20.0 Aug 26, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.19.1 Aug 12, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.19.0 Aug 11, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.18.0 Aug 9, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.17.2 Jul 29, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.17.1 Jul 28, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.17.0 Jul 24, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.16.0 Jul 2, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.15.3 Jun 17, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.15.2 Jun 16, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.15.0 Jun 13, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.14.2 Jun 3, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.14.1 May 31, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
| 1.14.0 May 27, 2026 | 21.1-1.1.0 | cmpreviewfixer-21.1-1.1.0.jar | From the published release |
"From pack files" means the list came from the pack's own files; "from the published release" means ForgeBase read the jars of the release itself.
Items and blocks
We can't match this mod to the pack's item list: it registers as cmpreviewfixer, and the pack's recipe dump has nothing under that name. That means we found nothing, not that the mod adds nothing. Search the item browser
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