Euro XY calibration

by luisonoff, published

Euro XY calibration by luisonoff Jul 8, 2015
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Based on the USA XY nickel test.

I did not find a XY test to use with euro coins that convinced me, so I made one myself.

This print is used to adjust/calibrate your 3D printer XY steps to get better dimensional accuracy. You can also use it to scale your CAD or SLICER program.

It has:

  • External dimensions XY 40mm
  • Internal cilinder hole to exactly fit 1€ coin 23.25mm
  • Internal dimensions XY to fit 1€ coin 23.25mm
  • Small cilinder diameter 4mm
  • Small cube side 4mm
  • Diagonal dimension from cilinder wall to cube wall 40mm
  • Small dimensions from XY slots to outer wall 4mm
  • Z dimension of main plate 4mm
  • Z dimension from bottom to top of cilinder or top of cube 8mm
  • Small letters to identify axis, printable with 0.4mm nozzle


First make sure you have calibrated your extruder motor steps. If not, search for it on google.

Print this with your desired Slicer, layer heigth and material.
I printed with Cura, 0.2mm and ABS.

Measure everything with a digital caliper, for example, try to put your euro coin inside and through the slots. Adjust your XY axis steps or your Slicer/Cad scale. Print again and iterate until you get it perfect.

Note1: this fine calibration is material depending, as it accounts for shrinking, so you may have to repeat it if you change your filament material, or even filament provider. There is many people who believe these tests are useless since every material is different and shrinking depends on many other factors. But if you use almost all the time same material and print on same conditions, you can find it useful.

Note2: if your extruder is calibrated you should not change flow, but some materials need a bit of adjustment to not leave empty spaces.

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I printed this with 0.2 in Cura (PLA), and it fits - almost. What's the recommended setting for the exterior hull - 0,8 as is default in Cura, or less?

After 1 print with slic3r and 1 print with cura, Never the coin goes into one Hole. I open the file with an editor and it isn't the right dimension. You put a diameter of 23 instead 23,30

I opened the file in SketchUp und mesured 23,3mm.

I have calibrated my Anet A8 printer with the calibration cube and got an result from 2 cm +/- 0,025 on all sides. I guess my printer is calibrated fine. Now i tried to print this Euro-Test. The outer sides are fine with 4cm but i cant fit any Euro-coin through any of the slots/hole. There are missing around 2 mm on each. How could this possible be? Is the STL-file maybe "faulty" on the inner holes?

Printing with Cura 14.07, 0,2mm layer and PLA from "DasFilament" on 195°C

Your/my problem may be the the shell width. It has something to do with the effective (printed) width of a single shell, the slicer's configuration and some other factors.

Beside the outer dimensions (12,0x mm) the thickness of the real inner and outer shells depends on the configured thicknesses.If you configured a shell width of 0.4mm (size of your nozzle) but the real printed width is 0.52mm you will have some overlapping, because your slicer calculated with 0,40mm. This allows the outer dimensions to be correct (you "calibrated" the deviation away) but now your inner dimension may be 2x 0.12mm to small.

I am having the same problem since weeks. I guess, the first thing to do is to calibrate the extrusion multiplier and the Z-Offset (via display => configuration...) in a way to get close to 0.4mm shell width and 0.2mm layer high. After that you must calibrate your X, Y and Z steps.

Calibrate shell width some kind of hollow box (40x40x20 in vase mode)
Calibrate X,Y,Z steps with: https://www.thingiverse.com/thing:195604

I am printing "DasFilament" PLA on 205°C (215°C +/- 15° is mentioned by the manufacturer - but I don't trust the measured values!) and my effective (printed) layer high is 0.19mm and the shell width is 0.42mm. Can't get it more precisely without under extrusion.

Nevertheless, the inner diameters are always about 0.2mm to 0.5mm too small. :/

STEP Calibration Piece (X, Y and Z axis)
by voltivo

My hole is not round... its a slight oval shape thus the coing doesnt fit.
it is biggest distance in the lengt from the small round to the small square.
how do i adjust my printer to get it good?
its a delta print tower

If your hole is distorted in diagonal I think you cannot fix it just changing X or Y steps. Check your printer geometry, and assembly, and wiring, or maybe (last chance) find some extra parameter to calibrate in firmware?

Usefull! i don't have a caliper so this is great!

No problem. Glad it helps others. :)