Commit progress on stage 1

docs/stages/stage-1.md

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+---
+layout: default
+title: Stage 1
+nav_order: 1
+parent: Stages
+permalink: docs/stages/stage-1
+---
+
+![Endorphin stage 1](/assets/images/docs/stages/stage-1/stage-1-render-lg.png)
+{: .w-1_2 .float-right }
+
+# Stage 1: Hybrid CoreXY
+{: .no_toc }
+
+> The goal of this stage is to drop the heaviest single part on the X carriage: **The stepper motor**. This stage alone will remove almost half a pound of moving weight but only takes a few hours to print and assemble.
+{: .fs-5 .fw-300 .text-grey-dk-100 .text-justify }
+
+## Table of contents
+{: .no_toc .text-delta .mt-8 }
+
+- TOC
+{:toc}
+
+---
+{: .clear-both }
+
+![Endorphin stage 1 plating](/assets/images/docs/stages/stage-1/plating.png)
+{: .w-3_5 .h-80 .float-left }
+
+## Printing
+
+It should be easy to guess the print orientation for most of these parts. The only difficult one is the oddly-shaped front corner assembly. There's one particularly flat face on the part that has no fillets on the corners; this is the face that was designed to be on the print bed.
+{: .text-justify }
+
+You should use **100% infill** for these parts and at least **4 perimeters/walls** (for screw hole durability). Parts printed with 0.2mm layer height look fantastic but 0.24mm is several hours faster.
+{: .text-justify }
+
+## Front Corner Assembly
+{: .clear-both }
+
+#### Remove Original Y Tensioner Plate And Install New Assembly
+{: .mb-4 }
+
+<video muted autoplay controls loop class="w-7_12 float-right">
+  <source src="/assets/vids/docs/assembly-front-corner.mp4" type="video/mp4">
+</video>
+
+1. Remove screws from front-right Y tensioner plate and set them aside for step 3
+1. Remove the screw from the tensioner keeping the Y belt captured
+1. Attach the new assembly to the frame, reusing the screws from the original plate
+
+## Move The X Stepper
+{: .clear-both }
+
+### Swap Motors
+{: .d-inline-block }
+
+Optional
+{: .label .label-blue }
+
+If you're using a direct drive extruder, you can make use of your old extruder stepper to drive the X belt. Because it's a stronger motor than the original X stepper, you'll be able to run the printer at higher speeds without skipping.
+
+In fact, even if you *are* running the original extruder, you can still swap the extruder and X motors without issue. As long as your hotend is able to keep up with the filament feed rate, your extruder stepper doesn't need an enormous amount of torque.
+
+## Tune Stepper Current

docs/stages/stages.md

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+---
+layout: default
+title: Stages
+nav_order: 2
+has_children: true
+permalink: docs/stages
+has_toc: false
+---
+
+# Stages
+
+{: .fs-5 .fw-300 }
+Endorphin was designed to be progressively upgraded--so you can get started with minimal cost and time, then upgrade at your own pace. Each stage will drop more moving weight, but will also require more materials and printed parts.
+
+> Note: Weight reduction and cost of each stage are listed individually from the stage before it. Grand totals of all the stages are added up in the final row.
+{: .fs-4 .fw-300 }
+
+| Stage     | Moving Weight Reduction | Cost             | Print Time |
+| :-------- | :---------------------- | :--------------- | :--------- |
+| 1         | 215g                    | $21              | ~12 hours  |
+| 2         | 270g                    |                  |            |
+| 3         | 90g[^1]                 |                  |            |
+| **Total** | **575g**                |                  |            |
+
+---
+
+[^1]: Because stage 3 adds a linear rail to the X axis, the weight of the new rail does negate the weight saved by dropping the v-slot printhead carriage. This stage isn't as much about dropping weight as the other two stages were. The benefits of this stage are mainly more print consistency on the X axis, access to the awesome Ratrig and Vz printheads, and complete liberation from those v-slot wheels.