What is print-design-rules?

A reference guide for designing 3D-printable parts in Blender, a 3D modelling program. It covers geometry details that affect whether parts print and fit correctly.

Check overhangs, wall thickness, hole sizes, clearances, rounded edges, print-in-place joints, and part orientation before printing with FDM printers.

It helps prevent failed prints caused by weak walls, unsupported angles, incorrect holes, or parts that do not fit together.

How seehiong/blender-mcp-bridge configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to seehiong/blender-mcp-bridge. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/seehiong/blender-mcp-bridge/main/.claude/skills/print-design-rules/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/seehiong/blender-mcp-bridge

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/seehiong/blender-mcp-bridge/print-design-rules/github.svg)](https://agentmods.dev/skills/seehiong/blender-mcp-bridge/print-design-rules)

Your own site

<a href="https://agentmods.dev/skills/seehiong/blender-mcp-bridge/print-design-rules"><img src="https://agentmods.dev/badge/skills/seehiong/blender-mcp-bridge/print-design-rules/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/seehiong/blender-mcp-bridge/print-design-rules"><img src="https://agentmods.dev/badge/skills/seehiong/blender-mcp-bridge/print-design-rules.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 120 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,422 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00120	$0.01422
Opus 5.5	$0.00048	$0.00569
Sonnet 5.5	$0.00024	$0.00284
Haiku 4.5	$0.00012	$0.00142

Measured 1mo ago against content hash fd4f59a2435e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

print-design-rules scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/print-design-rules/SKILL.md · 120 lines

How it starts

The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Design rules for printable geometry

Rules extracted from 11 video sources, each citing the video and second it came from. Live in data/design-rules.json — 111 rules, of which 17 carry a number a source actually stated and 36 more take a conventional default.

Consult these while modelling, not after. Every constraint below is cheap to honour in CAD and expensive to discover from a failed print.

The attested numbers

These are the values a source stated on camera. Prefer them over anything else.

constraint	value	note
Unsupported overhang	45–50°	five sources agree; steeper needs support
Minimum wall	1 mm, or 2× nozzle width	below this the slicer drops it
Vertical minimum thickness	1 mm	for reliability and strength
Hole oversize (pin fit)	0.25 mm larger than the pin	FDM holes print undersized
Hole tolerance (fasteners)	0.2 mm	standard hardware
Mating faces	0.1 mm	two printed parts, tight
Tight print-in-place joint	0.125 mm gap
Looser / less precise printer	0.2–0.25 mm
Shrink-prone materials	up to 0.5 mm	ABS, ASA, nylon
Clearance offset on inner face	0.5 mm
Pin tip	45° chamfer, not a fillet	a chamfer holds constant overhang; a fillet goes from vertical to horizontal
Micro-feature slots	0.2 mm
Taper from build plate	5–10 mm	instead of a sudden transition

Querying the full set

The table above is the measured core. For anything else, read the file:

import json
from pathlib import Path

RULES = json.loads(Path("data/design-rules.json").read_text(encoding="utf-8"))["rules"]

def design_rules(keyword="", topic="", allow_defaults=False, limit=20):
    hits = [
        r for r in RULES
        if (not topic or r["topic"] == topic)
        and (not keyword or keyword.lower() in r["rule"].lower())
        # Strict unless asked: most of the file is conventional practice,
        # not a number any source stated.
        and (allow_defaults or r["value_source"] == "source")
    ]
    hits.sort(key=lambda r: {"source": 0, "default": 1, "none": 2}[r["value_source"]])
    return hits[:limit]

Read the full file on GitHub · 120 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago Changed · +2 lines fd4f59a2435e
2mo ago First seen · 118 lines · 120 tokens per session scan A d8b1bcc9a2a0

Subscribe to this mod's changes

print-design-rules is a skill published in the GitHub repository seehiong/blender-mcp-bridge (84 stars, last pushed 1mo ago), licensed MIT. It adds 120 tokens to every session and 1,422 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

3d-modeling Design and UX Hardware and IoT api architectural-visualization automation blender blender-addon

print-design-rules next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
print-design-rulesseehiong/blender-mcp-bridge	Skill	84	1mo ago	MIT	A	120	Claude Code
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fit-repair-optimizerRobLe3/cc-blender-skill	Skill	144	25d ago	MIT	A	69	Claude Code
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kernelcad-kinematicw1ne/kernelCAD-web	Skill	35	today	MIT	A	94	Claude Code, Codex
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blender-mcp-bridge: Skill for Claude Code