# Summary of #hplusroadmap IRC Log (June 25, 2011)

* Links to 3D photolithography tutorials were shared, including procedures from Wisconsin MRSEC (http://mrsec.wisc.edu/Edetc/nanolab/3D_print/index.html) and Illinois nano-CEMMS (https://nano-cemms.illinois.edu/materials/3d_printing_full).

* A solar-powered 3D printer that prints glass from sand was discussed, referencing Markus Kayser's project that uses solar energy to power both a 3D printer and laser cutter (http://thisiscolossal.com/2011/06/markus-kayser-builds-a-solar-powered-3d-printer-that-prints-glass-from-sand-and-a-sun-powered-laser-cutter/).

* Detailed technical discussion about PDF watermark removal techniques using tools like pdftk, with specific focus on removing institutional identifiers and publisher watermarks from scientific papers.

* A project was described to extract and analyze text from a large collection of scientific PDFs (4.5GB) from diyhpl.us/~bryan/papers2, with the goal of automatically tagging and grouping papers based on content.

* Methods for extracting DOI numbers from PDFs were discussed as a way to retrieve additional metadata from journal websites, noting that approximately 10% of documents in the collection contained unusually little extractable text.

* Ubigraph was mentioned as a tool for graph visualization (http://ubietylab.net/ubigraph/).