added 3D printing manuals in resources, upd. read me & class overview

Readme.md

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+# Practical Printing
+
+Repository for all updated 3D printing resources (circa Spring 2026)
+
+A six week course for learning to use 3D Printing in practical & efficient ways.
+
+## Week 1 : Intro to 3D Printing
+Introduction to 3D Printing through a blend of hands-on & theoretical work. Set up our first print to discuss next week!
+
+* What is 3D Printing (technical terminology, hardware, use cases)
+* Different kinds of 3D printing machines, tools, and techniques
+* What is a slicer, why do we need it, and how to use it 
+
+## Week 2 : 5 Things to Know/Old Skool Modelling
+Our first dive into CAD for 3D printing through FreeCAD. Learn to translate real-world use cases & dimensions into the digital environment. Discover the most common 3D printing problems and how to accommodate for them.
+
+* 5 most common 3D printing issues
+* Parametric Design
+* Meshing a model
+
+## Week 3 : Scanner-Assisted Modelling (Part 1: 2D Scans)
+Explore how familiar tools can be used to streamline 3D modelling through the use of a 2D document scanner. 
+
+* 2D Scanning to 3D modelling workflow
+* 3D Printing tolerances & fit tests
+* Slicer tips & tricks
+
+## Week 4 : Scanner-Assisted Modelling (Part 2: 3D Scans)
+Experiment with using a Creality Otter 3D Scanner to model a replacement part for a broken item. Learn to design 3D models based on existing 3D models.
+
+* 3D Scanning - how-to + tips & tricks
+* Point clouds, meshes, and tessellation
+* Manipulation of existing 3D models
+
+## Week 5 : Scanner-Assisted Modelling (Part 3: 3D Scans)
+TBA
+
+## Week 6 : Resin Printing
+Personalize your own custom keycaps printed on the Elegoo Saturn 4 Ultra resin printer. Discover the difference between the classic, FDM printing and resin printing.
+
+* SLA vs. FDM Printing - why & use cases
+* Design & slicing differences
+* Post-processing requirements & additional techniques
+