Ironing Test for PrusaSlicer – Flow and Speed Hexagon Grid | HexCalibr
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Fifteen hexagons, each ironed at its own flow and speed: feel the smoothest, its labels are your settings.
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Fifteen hexagons on one thin plate, each one ironed with its own flow and speed. Feel the tops, pick the smoothest: its column is your ironing flow, its row your ironing speed. No profile edits and no custom G-code: every hexagon is a PrusaSlicer modifier.
Step-by-step guide
Photos of too little, right and too much, and where the values go in PrusaSlicer: hexcalibr.ui4.eu/ironing.html
What it does
The columns are the ironing flow, 5, 10, 15, 20 and 25 %. The rows are the ironing speed, 15, 30 and 60 mm/s, front row slowest. The PrusaSlicer default, 15 % at 15 mm/s, is in the grid. Look at the middle of each hexagon under a low light, then run a fingernail over it: too little leaves the top lines visible, too much makes small bumps and ridges.
Why HexCalibr
No profile edits, no G-code. Each hexagon is a modifier with its own ironing flow and speed. It works on any firmware, and the labels and the plate are not ironed.
Flow and speed together. The speed does not change how much plastic goes down, but it changes how long the hot nozzle stays on each spot. A grid shows both at once.
Faster ironing. If two speeds feel the same, take the faster one: ironing is slow, and that saves time on every print.
Quick steps
Clean the nozzle.
Download
ironing_5-25.3mf(not "Download all" as a ZIP) and open it in PrusaSlicer 2.9 with File › Open project, never Import. Slice and print, with the speed factor left at 100 %.Read the middle of each hexagon under a low light and with a fingernail. Keep the smoothest.
Set Print Settings › Infill › Ironing (expert mode): Enable ironing, the Flow rate of your hexagon, and Spacing between ironing passes at 0.1 mm. Type the speed in Print Settings › Speed › Ironing. Save the print preset.
A real result
PETG on a RatRig V-Core 4 IDEX (RatOS, T0), 47 min. At 5 % the top lines still showed; at 25 % the tops were covered in small bumps and felt ridged. The smoothest under a fingernail was 15 % at 30 mm/s: the PrusaSlicer default flow, but at twice its speed, so ironing takes half the time.
Share your Make
Printed it? Post a Make with a photo of the hexagons under a low light, and say which one you picked. Makes help other people read their own grids.
Watch the trailer
License and credits
CC BY-SA 4.0. HexCalibr by Matteo Beretta. If you share or remix it, credit "HexCalibr by Matteo Beretta", link back to this page, and keep the same license. The HexCalibr name and logo are not covered by the license: please give modified versions a different name. The official, always-updated files are on this page. Original design (see License and credits).
Not affiliated with or endorsed by Prusa Research, Rat Rig, the Klipper or Marlin projects, or any other brand named here. All trademarks belong to their owners.
Version 0.3 · made for PrusaSlicer 2.9 (2.7 minimum).
🇮🇹 Italiano
Quindici esagoni su una piastra sottile, ognuno stirato con un flusso e una velocità diversi: scegli il più liscio al tatto, e le sue etichette sono il tuo flusso e la tua velocità di stiratura. Nessuna modifica ai profili. Apri il file con File › Apri progetto. Guida completa in italiano: hexcalibr.ui4.eu/it/ironing.html