How do I get access?
A physical-book code gives Pro access for 90 days; the PDF edition - for 30 days.
Test Print Designer
Custom test model - your parameters, your printer
Standard test prints (3DBenchy, Calibration Cube) don't cover every scenario. This designer lets you build a custom test object - define overhang angles, bridging distances, retract tests, tolerance gauges - exactly for your use case.
Available with the Pro plan (15 EUR per month). The printed book includes 3 months of Pro.
Key features
20+ test modules
Overhang angles (15°-80°), bridging distances (5-50mm), retraction tests, dimensional accuracy, fit tolerance, thin walls, fine detail, support test.
Stack-able
Combine 2-5 modules in one test print - save material and time.
Parametrized
Each module with adjustable parameters - e.g. "overhang test" from 20° to 70° in 5° steps.
Size-aware
Adapts to your build volume - Voron 300 vs Anycubic Photon, different test setup.
Export
STL + .ini settings + measurement guide PDF.
Measurement guide
After printing - step-by-step on how to measure each module.
How it works
- 1Pick modules (overhang, bridging, retract, etc.).
- 2Configure parameters for each.
- 3Preview - see the stacked test object.
- 4Export STL + measurement guide.
- 5Print and measure per the guide.
Who it's for
Post-upgrade calibrator
Replaced hot end or extruder - specific test for those changes.
Material tester
New filament - what's the overhang capacity? Bridging up to what mm?
Print service
Standardized test print for every new filament or printer upgrade.
Educational
Course modules - what each test means.
Frequently asked
How many modules?
20+ as of 2026-05. Growing with 1-2 new monthly.
Which slicer?
Universal STL - works with all. .ini export is for PrusaSlicer.
Supports resin printers?
No, focused on FDM. For resin tests see specialized resin test prints.
Custom test?
Not yet - but you can suggest in the community forum; we'll build it.
Want full access to all 148 instruments?
The Big Book of 3D Printing includes 90 days of Pro access to every instrument with the physical book's code - 30 days with the ebook. Calculators, wizards, comparisons, generators, and more.
Get the book