How to Fix Bed Adhesion Problems on the Kobra 3 PEI Sheet

How to Fix Bed Adhesion Problems on the Kobra 3 PEI Sheet PEI is excellent — but it needs care to work consistently. Here's the full troubleshooting and maintenance guide. Troubleshooting by Symptom The IPA Clean (Do This Before Every Print) 1. Wet a lint-free cloth or paper towel with 90%+ IPA 2. Wipe the entire bed surface firmly 3. Let dry completely (30 seconds) 4. Don't touch the surface after cleaning Never use: dish soap (leaves residue), window cleaner (ammonia damages PEI), acetone (destroys PEI surface) Deep Clean (Weekly or When Adhesion Degrades) 1. Remove PEI sheet if it's magnetic 2. Wash with dish soap and warm water — just this once 3. Rinse thoroughly 4. Dry with a lint-free cloth 5. Final wipe with IPA Z Offset Z offset is the most common cause of adhesion failures: Too high = filament doesn't press into bed = pops off The first layer should be visibly squished — lines just touching each other Adjust in 0.025 mm increments When to Replace the PEI Sheet Deep scratches that prints catch on Spots that no longer adhere even after cleaning Bubbles or delamination After ~500 prints as a rough guide Material-Specific Notes

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