Frequently Asked Questions

FailFixer is a lightweight Windows desktop application that generates safe resume G-code for failed FDM 3D prints. Instead of reprinting from scratch, you tell FailFixer which layer the print failed on, and it creates a new G-code file that picks up exactly where the failure occurred.

FailFixer parses your original .gcode file, identifies all layers, and strips everything below your selected resume layer. It then injects a safe resume header that handles temperatures, positioning, and extruder priming — so your printer picks up cleanly without crashing into the existing part.

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.

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 resume 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.

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 resumes from the beginning of the selected layer. If the failure happened partway through a layer, that layer will be reprinted in full. This ensures consistent bonding and avoids gaps from partial layers.