Delta DLP 3D Printing with Large Size

Chenming Wu, Ran Yi, Yong-Jin Liu, Ying He, Charlie Wang

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

15 Citations (Scopus)


We present a delta DLP 3D printer with large size in this paper. Compared with traditional DLP 3D printers that use a low-cost off-the-shelf consumer projector and a single vertical carriage, the platform of our delta DLP 3D printer can also move horizontally in the plane. We show that this structure allows the printer to have a larger printing area than the projection area of a projector. Our system can print 3D models much larger than traditional DLP 3D printers. The
major challenge to realize delta 3D printing with large size comes from how to partition an arbitrary planar polygonal shape (possibly with holes or multiple disjoint polygons) into a minimum number of rectangles with xed size, which is
NP-hard. We propose a simple yet efcient approximation algorithm to solve this problem. The time complexity of our algorithm is O(n3 log n), where n is the number of edges in the polygonal shape. A physical prototype system is built and
several large 3D models with complex geometric structures have been printed as examples to demonstrate the effectiveness of our approach.
Original languageEnglish
Title of host publication2016 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)
Number of pages6
ISBN (Print)978-1-5090-3762-9
Publication statusPublished - 2016
Event2016 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 2016 - Daejeon, Korea, Republic of
Duration: 9 Oct 201614 Oct 2016


Conference2016 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 2016
Abbreviated titleIROS 2016
Country/TerritoryKorea, Republic of
Internet address


  • Printers
  • Solid modeling
  • Shape
  • Approximation algorithms
  • Liquids


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