n=1 Series 01 / First Term

The Metrolog Scale

A 3D-printed measuring instrument that thinks like a calliper. Slide jaws for inner and outer dimensions. A linear scale for length. Designed in CAD, printed in PLA, finished by hand.

0 20 40 60 80 100 mm 0 · · · · 0.1 mm · · · · 1 0.0 mm DETAIL A · 4:1 0.1 mm / DIVISION FIXED JAW SLIDING JAW · drag → GRIP VERNIER SCALE 3D-PRINTED · PLA · LAYER HEIGHT 0.2 mm REV. B — 2026.05 METROLOG SCALE · n=1 DWG-001 A4 E+1 ATELIER REV. B
Live measurement:0.00 mm

Specifications

DesignationMETROLOG / n=1
FunctionLinear scale + calliper
Range0 – 120 mm
Resolution0.1 mm (vernier)
MaterialPLA / matte black
Layer height0.2 mm
Mass~ 38 g
EditionSeries 01 / Open

Notes from the bench

  • Sliding jaw for outer-dimension grip.
  • Reverse jaw for inner-dimension reading.
  • Vernier scale rated for 0.1 mm — within tolerance for desk work.
  • Printed in one part. No fasteners. No glue.
  • Calibrated against a steel reference before shipping.
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Printed in one piece
/02 From the bench

Designed in Onshape

1,586 vertices, 3,160 faces. Modelled to actual millimetres — 165 × 28 × 9 mm — so the printed object lands at exactly the dimensions on the spec sheet.

Printed in PLA

Matte black, 0.2 mm layer height, single-part print with no support material on the working surfaces. The sliding action comes from the print, not from a fastener.

The vernier

Eight sub-ticks on the sliding jaw resolve to 0.1 mm. Generous for steel; honest for plastic. Within tolerance for the kind of work this is built for.

Calibration

Before each unit ships, the jaws are checked against a steel reference. If the reading drifts past 0.2 mm, the print is rejected.

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