US 12,257,783 B2
Method and system for three-dimensional fabrication
Eliahu M. Kritchman, Tel-Aviv (IL); and Eduardo Napadensky, Natania (IL)
Assigned to Stratasys Ltd., Rehovot (IL)
Filed by Stratasys Ltd., Rehovot (IL)
Filed on Oct. 12, 2023, as Appl. No. 18/379,193.
Application 14/329,953 is a division of application No. 12/593,970, granted, now 8,784,723, issued on Jul. 22, 2014, previously published as PCT/IL2007/000429, filed on Apr. 1, 2007.
Application 18/379,193 is a continuation of application No. 16/871,077, filed on May 11, 2020, granted, now 11,801,644.
Application 16/871,077 is a continuation of application No. 15/227,049, filed on Aug. 3, 2016, granted, now 10,649,438, issued on May 12, 2020.
Application 15/227,049 is a continuation of application No. 14/329,953, filed on Jul. 13, 2014, granted, now 9,417,627, issued on Aug. 16, 2016.
Prior Publication US 2024/0043106 A1, Feb. 8, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. B29C 64/393 (2017.01); B29C 64/00 (2017.01); B29C 64/112 (2017.01); B29C 64/386 (2017.01); B33Y 10/00 (2015.01); B33Y 30/00 (2015.01); B33Y 50/02 (2015.01); B63H 16/04 (2006.01); G05B 19/4099 (2006.01); G05B 19/418 (2006.01); G06F 30/20 (2020.01); G06T 19/20 (2011.01)
CPC B29C 64/393 (2017.08) [B29C 64/00 (2017.08); B29C 64/112 (2017.08); B29C 64/386 (2017.08); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B33Y 50/02 (2014.12); B63H 16/04 (2013.01); G05B 19/4099 (2013.01); G05B 19/41885 (2013.01); G06F 30/20 (2020.01); G06T 19/20 (2013.01); B63H 2016/043 (2013.01); G05B 2219/32359 (2013.01); G05B 2219/35134 (2013.01); G05B 2219/49007 (2013.01); G06T 2219/2016 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method of fabricating a three-dimensional object, comprising spreading powder material on a tray to form a plurality of layers, each powder layer comprising a configured pattern corresponding to the shape of the three-dimensional object, wherein for each layer the tray is lowered to form said layer at a predetermined thickness; and
wherein a post-formation shrinkage of said powder layers along a vertical direction is compensated for by:
i) lowering said tray by a different step size for different layers, wherein determination of the compensated slice data assumes layers of same thickness; or
ii forming each layer from compensated slice data, wherein determination of the compensated slice data assumes layers of different thickness; and wherein said tray is lowered by a constant step size for different layers.