Hangprinter

The Hangprinter v0, also called the Slideprinter, is a 2D plotter. It was designed solely to test if a 3D version could realistically be created.{{cite web|last1=Ludvigsen|first1=Torbjørn|title=The Slideprinter|url=http://vitana.se/opr3d/tbear/2015#Slideprinter_Update|website=Torbjørn's RepRap Blog|publisher=Torbjørn Ludvigsen|accessdate=21 May 2018}}

File:Hangprinter version 0.jpg|Hangprinter v0

The Hangprinter v1 uses counter weights to stay elevated.{{cite web|last1=Ludvigsen|first1=Torbjørn|title=First Finished Print|url=https://torbjornludvigsen.com/blog/2015/#hangprinter_project_14|website=Torbjørn's RepRap Blog|publisher=Torbjørn Ludvigsen|accessdate=22 Sep 2020}}

File:Hangprinter v1 first print.jpg|Hangprinter v1. Counterweights tied in at its center cylinder.

All parts of the Hangprinter Version 2 are contained within a single unit which uses cables to suspend the printer within a room, allowing it to create extremely large objects over 4 meters tall.{{Cite news|url=http://www.3ders.org/articles/20170308-frameless-hangprinter-reprap-turns-an-entire-room-into-a-3d-printer.html|title=Frameless 'Hangprinter' RepRap turns an entire room into a 3D printer|work=3ders.org|access-date=2017-03-19|language=en-US}}{{Cite news|url=http://www.fabbaloo.com/blog/2017/3/7/the-hangprinter-a-frameless-3d-printer|title=The Hangprinter: A Frameless 3D Printer|work=Fabbaloo|access-date=2017-03-19|language=en-US}}{{Cite news|url=https://3dprintingindustry.com/news/interview-inventor-frameless-hangprinter-3d-printer-building-tower-babel-107749/|title=Interview with the inventor of the frameless Hangprinter 3D printer building the Tower of Babel|work=3D Printing Industry|access-date=2017-03-19|language=en-US}}{{Cite web|url=http://hackaday.com/2017/03/20/hanging-3d-printer-uses-entire-room-as-print-bed/|title=Hanging 3D Printer Uses Entire Room As Print Bed|last=By|website=Hackaday|date=20 March 2017 |access-date=2017-03-20}}

File:Hangprinter 3D printer.jpg

Version 3 of the Hangprinter has the motors and gears attached to the ceiling, making the carriage lighter.{{Cite news|url=https://hackaday.com/2017/12/16/hangprinter-build-videos/|title=Hangprinter Build Videos|date=2017-12-16|work=Hackaday|access-date=2018-05-21|language=en-US}}

File:Torbjørn Ludvigsen's Hangprinter at the offices of E3D-Online.webm|Hangprinter printing at the offices of E3D Online

File:Adrian Bowyer with a Hangprinter RepRap 3D printer at a workshop at E3DOnline.jpg|Adrian Bowyer with a Hangprinter

File:Hangprinter v3.jpg|Hangprinter v3 suspended

File:Hangprinter v3 printing 01.jpg|Close up of Hangprinter v3 printing

File:Hangprinter v3 printing 03.jpg|View of entire carriage whilst printing

File:Hangprinter instruction images 02.jpg|Components of the Hangprinter V3. The red parts and the white parts in the blue box are 3D printed.

Version 4 includes upgrades from version 3 including flex compensation, better calibration and automatic homing.{{Cite web|url=https://torbjornludvigsen.com/blog/2018/#hangprinter_project_61|title=Torbjørn's Reprap blog|website=torbjornludvigsen.com|publisher=Torbjørn Ludvigsen|access-date=2020-09-22}}

File:Printing Benchys with Hangprinter v4.webm|Two 3DBenchys being printed on a Hangprinter

To enable 3D printers to economically use recycled plastic feedstocks to enable distributed recycling and additive manufacturing (DRAM){{Cite journal |last1=Cruz Sanchez |first1=Fabio A. |last2=Boudaoud |first2=Hakim |last3=Camargo |first3=Mauricio |last4=Pearce |first4=Joshua M. |date=2020-08-10 |title=Plastic recycling in additive manufacturing: A systematic literature review and opportunities for the circular economy |journal=Journal of Cleaner Production |language=en |volume=264 |pages=121602 |doi=10.1016/j.jclepro.2020.121602 |s2cid=218816964 |issn=0959-6526|doi-access=free |bibcode=2020JCPro.26421602C |url=https://digitalcommons.mtu.edu/cgi/viewcontent.cgi?article=3057&context=michigantech-p }}{{Cite journal |last1=Cruz Sanchez |first1=Fabio A. |last2=Boudaoud |first2=Hakim |last3=Hoppe |first3=Sandrine |last4=Camargo |first4=Mauricio |date=2017-10-01 |title=Polymer recycling in an open-source additive manufacturing context: Mechanical issues |url=https://www.sciencedirect.com/science/article/pii/S2214860416301695 |journal=Additive Manufacturing |language=en |volume=17 |pages=87–105 |doi=10.1016/j.addma.2017.05.013 |issn=2214-8604}} several types of fused granular fabrication (FGF)/fused particle fabrication (FPF){{Cite journal |last1=Woern |first1=Aubrey L. |last2=Byard |first2=Dennis J. |last3=Oakley |first3=Robert B. |last4=Fiedler |first4=Matthew J. |last5=Snabes |first5=Samantha L. |last6=Pearce |first6=Joshua M. |date=2018 |title=Fused Particle Fabrication 3-D Printing: Recycled Materials' Optimization and Mechanical Properties |journal=Materials |language=en |volume=11 |issue=8 |pages=1413 |doi=10.3390/ma11081413 |pmid=30103532 |pmc=6120030 |issn=1996-1944 |doi-access=free |bibcode=2018Mate...11.1413W }} -based 3D printers have been designed and released with open source licenses. First, a large-scale printer was demonstrated{{Cite journal |last1=Petsiuk |first1=Aliaksei |last2=Lavu |first2=Bharath |last3=Dick |first3=Rachel |last4=Pearce |first4=Joshua M. |date=2022 |title=Waste Plastic Direct Extrusion Hangprinter |journal=Inventions |language=en |volume=7 |issue=3 |pages=70 |doi=10.3390/inventions7030070 |issn=2411-5134 |doi-access=free }} with a GigabotX extruder{{Cite web |title=Gigabot X 2 |url=https://re3d.org/portfolio/gigabot-x/ |access-date=2023-02-27 |website=re:3D {{!}} Life-Sized Affordable 3D Printing |language=en-US}} based on the open source cable driven hangprinter concept. Then detailed plans using recyclebot auger techniques were released in HardwareX to build such a printer for under $1700.{{Cite journal |last1=Rattan |first1=Ravneet S. |last2=Nauta |first2=Nathan |last3=Romani |first3=Alessia |last4=Pearce |first4=Joshua M. |date=2023-03-01 |title=Hangprinter for large scale additive manufacturing using fused particle fabrication with recycled plastic and continuous feeding |url=https://www.hardware-x.com/article/S2468-0672(23)00008-1/fulltext |journal=HardwareX |language=English |volume=13 |pages=e00401 |doi=10.1016/j.ohx.2023.e00401 |issn=2468-0672 |pmc=9930197 |pmid=36818952}} This approach would further reduce the cost of using hangprinters to make large scale products as the cost of recycled shredded plastic is ~$1–5/kg while filament is generally around $20/kg. Makers that have built open source granulators{{Cite journal |last1=Ravindran |first1=Arvind |last2=Scsavnicki |first2=Sean |last3=Nelson |first3=Walker |last4=Gorecki |first4=Peter |last5=Franz |first5=Jacob |last6=Oberloier |first6=Shane |last7=Meyer |first7=Theresa K. |last8=Barnard |first8=Andrew R. |last9=Pearce |first9=Joshua M. |date=2019 |title=Open Source Waste Plastic Granulator |journal=Technologies |language=en |volume=7 |issue=4 |pages=74 |doi=10.3390/technologies7040074 |issn=2227-7080 |doi-access=free }} or have access to other types of waste plastic shredders (e.g. from Precious Plastic{{Cite web |title=Precious Plastic Pro Machines |url=https://preciousplastic.com//solutions/machines/pro |access-date=2023-02-27 |website=preciousplastic.com}}) can generate feedstock for hanging waste printers for under $1/kg, which makes large scale production with a hangprinter competitive with any conventional manufacturing process.

In 2022, a patent describing the “Sky Big Area Additive Manufacturing” (SkyBAAM) system was granted to UT-Battelle, LLC, a nonprofit corporation that operates the Oak Ridge National Laboratory (ORNL). The patent describes the core features already featured in HangPrinter, causing controversy in the open source community. The RepRap project established a GoFundMe campaign to cover the legal costs in their upcoming action to challenge the patent.{{Cite web|url=https://www.techdirt.com/2022/06/24/ridiculous-govt-contractor-copies-open-source-3d-printing-concept-and-patents-it/|title=Ridiculous: Gov't Contractor Copies Open Source 3D Printing Concept… And Patents It|date=25 June 2022 |publisher=TechDirt|access-date=2022-06-26}}{{Cite web|url=https://3dprintingindustry.com/news/ornl-gains-patent-for-skybaam-cable-hoisted-construction-3d-printing-technology-203113/|title=ORNL gains patent for 'SkyBAAM' cable-hoisted construction 3D printing technology|date=28 January 2022 |publisher=3D Printing Industry|access-date=2022-06-26}}{{Cite web|url=https://patents.google.com/patent/US11230032B2/en?oq=US11230032B2|title=US11230032B2|access-date=2022-06-26}}

In May 2023 it was announced that the US Patent Office rejected the wide claims of the SkyBAAM patent and would be settling on a much narrower patent instead. Per a post on Torbjørn Ludvigsen's blog "They largely agreed with our analysis. They rejected all the patent's original claims. They accepted a narrower version of them."{{Cite web |last=Ludvigsen |first=Torbjorn |title=Torbjorn Ludvigsen |url=https://torbjornludvigsen.com/blog |access-date=2023-08-08 |website=torbjornludvigsen.com |language=en}} Per the interpretation provided in that post the narrower patent would only cover cases where every detail provided is included in the design, instead of those designs with any of the described details.

• [https://hangprinter.org/ The Hangprinter Project's Webpage]
• [https://torbjornludvigsen.com/blog Torbjørn Ludvigsen's RepRap blog]
• [https://salt.bountysource.com/teams/hangprinter Hangprinter on Bountysource] {{Webarchive|url=https://web.archive.org/web/20180703220403/https://salt.bountysource.com/teams/hangprinter |date=3 July 2018 }}
• [https://www.facebook.com/groups/hangprinter/?fref=nf Hangprinter Facebook page]

• [https://github.com/tobbelobb/hangprinter Hangprinter files on GitHub]
• [http://reprap.org/wiki/Hangprinter Hangprinter on RepRap wiki]

• [https://www.youtube.com/watch?v=dZLtPFJEQi0 Hangprinter presentation, Torbjørn Ludvigsen]
• [https://www.youtube.com/watch?v=Jk4fhQvNoaM&t=1s The Hangprinter #3DMeetup], Thomas Sanladerer, YouTube
• [https://www.youtube.com/watch?v=5XRfW3YaQeE RepRap HangPrinter Workshop] at E3D with Torbjørn Ludvigsen, Richard Horne (RichRap), YouTube

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