Customizable Metric Feeler Gauges - Two Thickness Presets, Native Playground Recipes

Customizable feeler-gauge prototypes made with native TrueGeometry Playground commands. Seven rounded-tip, constant-thickness leaves per set, with real pivot bores and two metric presets.

IMPORTANT: Unprinted, unsliced and uncalibrated plastic gap comparators, NOT calibrated steel feeler gauges. The 0.20 mm leaf is experimental and may be fragile or inaccurate on your printer. No physical assembly, accuracy or durability testing has been done. Do not use these for engine valve adjustment, safety-critical inspection or certified tolerance acceptance. All gallery pictures are CAD renders, not photographs of printed parts.

TWO PRESETS

Fine A-G: 0.20 / 0.30 / 0.40 / 0.50 / 0.60 / 0.80 / 1.00 mm.

Workshop A-G: 0.50 / 0.75 / 1.00 / 1.25 / 1.50 / 1.75 / 2.00 mm.

Each leaf is 84 mm long, with a 10 mm measuring tongue, rounded plan-view R5 nose, 14 mm pivot root and 4.4 mm nominal bore. No thickness wedge or raised lettering crosses the measuring faces.

WHAT TO PRINT

The first STL is the upright full fine-set assembly reference, named REFERENCE_DO_NOT_PRINT, so the complete model appears first. Print the two FLAT_PRINT_LEAVES plates, not either reference assembly. Their broad faces lie in XY with thickness along Z; each plate footprint is 84 x 128 mm. The second reference assembly shows the workshop stack.

HARDWARE IS USER-SUPPLIED

The CAD head, 4 mm smooth shank, nut, washers and shims are schematic references, not functional printed threads. Supply real M4-style hardware, two outer washers and six measured 0.20 mm interleaf shims. Reference outer washers are 0.80 mm thick, 9 mm OD / 4.4 mm ID. Fine leaf-plus-shim stack is 5.00 mm; workshop is 9.95 mm. Reference under-head screw lengths are 12 / 16 mm with a 3.2 mm nut. Measure your actual hardware and confirm fit, retention and engagement before use. Do not overtighten or buckle thin leaves.

CUSTOMIZE IN TRUEGEOMETRY PLAYGROUND

Full TrueGeometry Playground commands are in the attached recipe files and the article:

https://blog.truegeometry.com/0_0_0_0/blogs/post-546dd3d6.html 

Open https://www.truegeometry.com/CoreWebGLTG/KBEAgentHTTP.html in a fresh empty scene. Open Script, paste one complete recipe and click Run. Use one recipe per fresh scene. The flat, open-fan and folded recipes are included for both presets. The attached guide shows how to edit the leaf thickness and run the recipe.

Each leaf's thickness is the first number on its /sm_params line, immediately before /sm_part. For example, /sm_params 0.3 1 0.44 makes a 0.3 mm nominal leaf. These supplied recipes use resolved values. If changing an assembly recipe, also recalculate every later leaf/shim Z position, the top washer/nut position and screw length. Do not scale the whole STL, which also changes its bore and width. The updated Playground supports variables and arithmetic, but these tested recipes do not require them.

PRINT, MEASURE AND IDENTIFY

Start with one test leaf. Choose a layer schedule that can reach the intended height and inspect the slicer preview for omitted thin parts or rounded heights. First-layer effects, shrinkage, burrs, warping and wear change the result. Measure several points on each tongue with a suitable reference. Mark the ACTUAL measured thickness on the root, away from the measuring faces. STL loses display colors: keep plate order, or remeasure if mixed. Do not add tape or raised labels to the measuring faces. Reject leaves that are not flat and repeatable.

HONEST NATIVE MESH DISCLOSURE

No Boolean union, Boolean cut, external CAD kernel or mesh repair was used. These are native Playground exports.

Each flat plate: 1,876 triangles; 28 zero-area seam facets; 21 raw non-manifold edges; zero boundary edges. Diagnostic exclusion of zero-area facets only leaves zero boundary/non-manifold edges, but NO such exclusion or repair was applied to the delivered STLs.

Each full reference assembly: 4,100 triangles; 64 zero-area facets; 219 raw non-manifold edges; zero boundary edges. Diagnostic zero-area exclusion leaves 168 non-manifold edges because separate contacting shells/interfaces remain. Reference assemblies are not single manifold print-ready tools. Inspect the slicer result before printing the flat leaves.

COMMUNITY TESTING

If you test-print these, please post a Make with printer/material, layer settings, measured tongue thicknesses and fit notes. Honest test results will help others judge whether a preset is useful. Do not report nominal CAD thickness as measured accuracy.

AI DISCLOSURE

Yes - AI-assisted design, native command recipe preparation, checking, writing and illustration capture.

Licensed under Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Commercial use requires TrueGeometry's consent.

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