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.
- 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.