• A community effort is underway to create an open-source, repeatable photolithography rig capable of 1–50 µm resolution for microfluidics and micro-electronics, with a parts list designed to avoid scavenging.  
• CaptHindsight has demonstrated ~45 nm line-width polymer traces and ~100 nm spacing using inkjet + SLA deposition of copper and organic semiconductors, arguing that materials science, not hardware, is the current bottleneck.  
• Daeken is prototyping laser-printed transparencies as ultra-low-cost photomasks to replace $500 commercial masks for small-run micro-fabrication.  
• Epson piezo inkjet heads (75 µm nozzles, 5 kHz, 4–40 pL drops, 180 V drive) were reverse-engineered; practical advice shared includes filtering fluids to 1 µm, keeping viscosity ≤4 cP, and navigating waveform patents.  
• Carbon3D’s “fast SLA” was critiqued as incremental; the key component appears to be a $1 k/g PTFE oxygen-permeable membrane that mitigates oxygen inhibition during photopolymer curing.  
• DNA synthesis trends discussed: laser-pulse catapulting printers, synthetic DNA anti-counterfeiting, and the continued drop in sequencing cost despite high gene-length synthesis prices.  
• Viral cancer-therapy concepts explored: engineering viruses to tag tumors for immune clearance, combining with ultrasound ablation, and developing custom retroviral “personal medicine” approaches.  
• Key open-source resources shared: openlunchbox.com forum for open hardware, diyhpl.us wiki for DNA projects and neuro-ultrasound papers, and the Limbitless Arm open-source pediatric prosthetic project.