Snap-on CTC Dual bed levelling jig

Designed from scratch using the layout and coarse dimensions from https://www.thingiverse.com/thing:2460482
OnShape link where you can edit to your custom specifications: https://cad.onshape.com/documents/28e0bcaa853c187d0624b81f/w/fd7acef5713bafce038c5cfe/e/7e7969d14473af0ccc5dd0ed

**Improvements:**
- snaps on instead of using magnets or other means
- wider base for improved stability
- longer support for the indicator shaft
- offset on top to allow clearance for the indicator dial

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