Printer calibration tools for the Lua plugin system introduced in PrusaSlicer 3.0.
The build.erik.calibration bundle contains:
- PA Pattern — the Ellis pressure-advance calibration pattern: V-chevrons printed at stepped PA values with printed value labels. Pick the chevron with the crispest corner; its label is your PA value — enter it under Filament → Extrusion & Calibration → Pressure advance. Supports Marlin, Marlin 2, Prusa Buddy, Klipper, RepRapFirmware, and Repetier dialects, detected automatically from the printer profile with a manual override.
- Flow Ratio — OrcaSlicer's YOLO flow calibration: a plate of
Orca-standard coupons, each printed at a stepped flow multiplier and
labeled with the resulting absolute value. Pick the coupon with the
smoothest top surface; its label is your new extrusion multiplier —
enter it under Filament → Filament → Extrusion multiplier. Pure
G1output, so it works on every firmware. - Retraction — OrcaSlicer's retraction tower: two slender posts whose
connecting travel retracts 0.1 mm more per 1 mm of height (0 to 2 mm by
default). Find the height where strings between the posts stop, measure
the clean millimeters above the 0.4 mm base, and divide by 10 — enter
the result under Printer → Extruder → Retraction → Length. Pure
G1output; the retraction values are baked into the G-code, so it works on every firmware. - Firmware Probe — diagnostic that reports what the plugin API can read from your printer profile and which G-code dialect it resolves to. Run PrusaSlicer from a terminal to see its output; useful when reporting issues.
Copy (or symlink) the build.erik.calibration directory into PrusaSlicer's
user plugin folder, then Menu ▸ Plugins ▸ Rescan Plugins:
| OS | Plugin folder |
|---|---|
| macOS | ~/Library/Application Support/PrusaSlicer3-dev/lua/ |
| Windows | %APPDATA%\PrusaSlicer3-dev\lua\ |
| Linux | ~/.var/app/com.prusa3d.PrusaSlicer/config/PrusaSlicer3-dev/lua/ |
(The -dev suffix applies to alpha/beta builds.)
Requires PrusaSlicer 3.0.0-alpha11 or newer.
- Defaults suit a direct-drive 0.4 mm nozzle (PA 0–0.08, step 0.005). For Bowden extruders try 0–1.0 with step 0.05. Both ranges come from OrcaSlicer's PA calibration dialog defaults; the Bowden range matches Klipper's pressure-advance tuning guidance but hasn't been tested with this plugin (developed on direct-drive printers).
- PA Start/End/Step are text fields on purpose — the dialog's numeric float fields round to whole numbers in current alphas.
- Bed Width/Depth default to the CORE One (250×220); set them for your printer, they anchor the pattern's placement.
- The printer profile must use relative extruder distances (Prusa profiles do). Failures are shown as an embossed text object on the plate.
- The extra number after the PA scale is the volumetric flow rate (mm³/s) the chevrons printed at — the same label OrcaSlicer's pattern prints (print speed × bead cross-section × flow multiplier; both slicers model the bead identically).
- Coarse prints 11 coupons at 0, ±0.01 … ±0.05 around your current extrusion multiplier; fine prints 15 at ±0.005 … ±0.035 — OrcaSlicer's YOLO delta sets. Labels are absolute values, so the winning coupon reads as the exact number to type into the filament profile.
- Judge the top surface: pinholes and gaps mean under-extrusion, ridges and a rough nap mean over. With the default archimedean top pattern the corner chords collide with the center spiral and raise a tactile lip (Orca's trick) — run a fingernail across each coupon and pick the smoothest. monotonic gives a plain 45° top instead.
- Coupons are Orca's standard size (30×20 mm plus label tab); a coarse plate is ~13 g and ~35 minutes at 0.4 mm.
- Bed Width/Depth default to the CORE One (250×220); set them for your printer.
- The printer profile must use relative extruder distances (Prusa profiles do). Failures are shown as an embossed text object on the plate.
- The tower prints ~21 mm tall by default: 21 bands, one retraction step per millimeter, starting just above the 0.4 mm base. A different start/end/step changes the height to match.
- Retraction fires at the posts' interior closest points (like OrcaSlicer), so strings form across the gap you read; the outer flanks stay clean.
- The small cylinder at bed center is the plugin's required handle object — the slicer needs a real object on every layer to carry the custom G-code. Run on an empty plate so it lands at bed center.
- The printer profile must use relative extruder distances (Prusa profiles do). Failures are shown as an embossed text object on the plate.
OCL v1.1 + SWAtt v1 — Prusa's Open Community License with the Software Attribution add-on. Free to use, modify, and hack; derivatives must stay under OCL and credit the creator ("built on …") in their UI and source. See LICENSE.