How to Resume a Failed Print Mid-Layer on the Kobra 3

How to Resume a Failed Print Mid-Layer on the Kobra 3 Power outage, filament runout without a sensor, spaghetti — prints fail. Sometimes you can save them. Here's how to resume a print from a specific layer. When It's Worth Trying Part broke free from bed (adhesion issue) → not worth it, restart Power cut or stopped mid-layer → worth trying Filament ran out mid-print → worth trying if you catch it quickly Clog mid-print → fix clog, then try resume Method 1 — Orca Slicer "Cancel Object" and Re-Slice from Layer 1. Open your original .3mf or sliced project in Orca Slicer 2. Right-click object → Change Layer Height — note the failed layer number 3. Edit → Cut → Lower part — delete the lower portion 4. Re-slice the upper half 5. Modify start G-code to lift Z to failure height before starting Modified start G-code: G28 X Y ; home X and Y only — NOT Z G1 Z[failedheight + 0.2] F3000 ; move to resume height G92 E0 Method 2 — Edit G-code Directly 1. Open the original G-code in a text editor 2. Find the layer number (search ; layernum = X) 3. Delete everything before that layer 4. Add home and position commands at the top Tips for Success Clean nozzle before resuming — any ooze will blob at resume point Use same filament from same spool if possible (color match) Print slowly for the first few resumed layers (60% speed) Expect a visible seam line at the resume point — unavoidable Prevention Enable filament runout sensor in settings if your Kobra 3 has one Enable power loss recovery in the LCD menu Use UPS or power strip with surge protection

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