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A 3D Printer Calibration & Tolerance Test You Can Bank On

Have you lost all cents of reality for 3d printing?!

Now you can spend as less time and money checking the accuracy of your prints.

Using this 3d printer test, you can quickly make a 3d print for testing IRL (in real world) accuracy using these four common coin sizes:

  • United States one cent penny
  • Euro five cent coin
  • UK 1 pence
  • Australian five cent coin

Things that can affect accuracy:

  • Actual filament diameter: I’ve had some inconsistent filament diameter — over 1.95mm — throwing off prints that needed higher precision to fit properly.
  • Speed: Too fast and corners can get rounded and filament thinned out.
  • Flow rate: Too high and over extrusion can happen.

Square corners tend to round slightly due to filament width, so I added corner pockets to the vertical slots to offset this, and get a better fit test.

If your printer has a bit of elephant foot — first layer or two spreads out — then you may have to adjust your slicer, and/or start slightly higher above the bed, but risk first layer not sticking as well.

Let me know if you find this useful and helps you get better prints.

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Ringing in the New Year

Block Ring Design for 3D Printing.

Print-in-place hinged calibration ring.

A 3d printed ring scrolled through my social media feed. Later on a run, a question entered my mind, “what would be the best orientation for printing it?” On its side for strength and the ring would sacrifice the shape of the nubs and need support.

So in my head, concepted a print-in-place design. Also figured it can be used a calibration test for a 3d printer, too. When I got home, modeled this.

The hinges have a 0.25mm clearance and should fold down with little, if any force. Also added a 2mm hole that 1.75mm filament should tightly fit. 

Too bad I gave away all Legos to my nephew years ago so don’t have any to test.

Want to download the ring to try yourself? Here’s the file. Printed above in GreenGate Green Recycled PETG, using a 0.6mm nozzle and 0.2mm layer height. 3 perimeters and 50% fill. If the hinges are fused, your printer may be overextruding or have blobs that are causing issues.