Frequently Asked Questions

FailFixer is a lightweight Windows desktop application that generates safe recovery G-code for failed FDM 3D prints. You can either resume in-air at the failure point, or restart from the build plate to reprint only the missing section for a glue-later repair.

FailFixer parses your original .gcode file, identifies all layers, and builds a recovery file for your chosen mode. In Resume In-Air mode, it starts at your selected fail layer. In Restart from Build Plate mode, it reprints the missing upper section from the plate so you can glue it to the saved lower section. Both modes inject a safe header for temperatures, positioning, and extruder priming.

FailFixer V1 supports any FDM printer running Marlin-compatible firmware. This covers the vast majority of consumer and prosumer printers including Creality, Prusa, Anycubic, Artillery, and many more. Klipper and other firmware support is planned for future versions.

Yes. FailFixer works with G-code from any slicer — Cura, PrusaSlicer, SuperSlicer, OrcaSlicer, Simplify3D, and others. It reads standard G-code layer markers and falls back to Z-height detection when markers aren't present.

You have two options: (1) If your printer displays the current layer, note it down. (2) Measure the height of the printed part with calipers and enter the Z-height in millimeters. FailFixer will map it to the nearest layer. You can also apply a Z-offset adjustment if needed.

Use Resume In-Air when the failed print is still firmly attached and physically stable enough to continue directly at the fail point. Use Restart from Build Plate when continuing in-air is too risky (weak adhesion, messy fail zone, shifted part) and you'd rather print the missing top section cleanly, then glue it onto the saved lower section.

No. FailFixer is designed with safety as a priority. It never auto-homes the Z axis. It always lifts Z to a safe height before any XY travel, and only homes X and Y. The default safe lift is 10mm above the recovery start height, which you can adjust in the settings.

No. FailFixer V1 is file-based only. It generates a new .gcode file that you transfer to your printer via SD card, USB drive, or however you normally send files. There is no USB/serial, OctoPrint, or network connection in V1.

Internet is required for first-time Lemon license activation and occasional validation. After successful activation, FailFixer supports an offline grace window so temporary outages don't block normal use.

After purchase, Lemon Squeezy emails your license key instantly. Open FailFixer, paste the key into the activation dialog, and click Activate. That's it — no account creation inside the app.

Each license can be activated on up to 5 computers. The license does not expire (unlimited time), but activations are limited to five devices per purchase.

You can retrieve your key from your Lemon Squeezy receipt email and customer portal. If you still can't find it, contact support with your purchase email and we can help.

FailFixer V1 is a Windows desktop application packaged as a standalone .exe file. No Python installation is required. Mac and Linux support may come in future versions.

FailFixer can parse G-code files up to 50MB in under 3 seconds. Most consumer print files are well under this limit. Resume file generation takes under 1 second.

No. FailFixer is a one-time $4.99 purchase. You get lifetime access to all V1 updates. No recurring fees, no upsells, no premium tiers.

Since FailFixer is a digital product, refunds are handled on a case-by-case basis. If the software doesn't work as described, reach out and we'll make it right.

Not in V1. FailFixer V1 is designed for single-extruder FDM printers. Multi-extruder and multi-material support is a potential feature for future versions.

FailFixer starts from the beginning of the selected layer. If the failure happened partway through a layer, that layer will be reprinted in full in either mode. This gives you cleaner layer bonding and avoids gaps from partial layers.