# Option to inset / chamfer the extra thickness created by the "no raft" support

**URL:** https://forum.formlabs.com/t/option-to-inset-chamfer-the-extra-thickness-created-by-the-no-raft-support/28363
**Category:** Feature Requests & Ideas
**Created:** [July 26, 2020, 5:20am UTC](https://forum.formlabs.com/t/option-to-inset-chamfer-the-extra-thickness-created-by-the-no-raft-support/28363 "2020-07-26T05:20:17Z")
**Posts on this page:** 1
**Showing post:** 5

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### Author: ![hoolito](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/hoolito/32/16517_2.png) [@hoolito](https://forum.formlabs.com/u/hoolito)
#### Post date: [July 29, 2020, 1:10pm UTC](https://forum.formlabs.com/t/option-to-inset-chamfer-the-extra-thickness-created-by-the-no-raft-support/28363/5 "2020-07-29T13:10:54Z")

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As I understood (correctly?) from this thread: [Z-Compression Correction question](http://forum.formlabs.com/t/z-compression-correction-question/22728/11)  
There are several factors influencing how much the Z-Compression Correction needs to be:

1. Type of printer (I guess values are different for Form 2, 3, 3L…)
2. The tolerance on the hardware parts and assembly of the printer / vat
3. The composition of the resin: (I guess some are more compressible than others)
4. The total surface area of the first layers: (The bigger the area, the less compression can happen given the same spring force)
5. Layer height: (may be curing parameters alter the amount of compression of the resin)
6. (what else?)

hat else?)

Except for 2, I guess this value could be calculated by Preform at some extent.  
Now it just a field left for the user, but the amount of experimentation needed is not only a lot and expensive, but also needlessly duplicated by every user.

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