r/3Dprinting
Welcome to R/3D Printing! Come for the Benchy, stay for the Calibration!
Founded March 2010 · Public — anyone can post
/r/3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
Members
3,423,425
3.4M
Online now
—
not captured in the last snapshot
Posts per day
—
no sample yet
Comments per post
—
no sample yet
Growth · 7d
—
not enough history yet
Growth · 30d
+0.5%
+19K members · ≈33d
Published rules
9
1 mention promotion — quoted below
Last post
—
no sample yet
Distinct posters
—
no sample yet
Tracking since Aug 7 · growth spans are the real distance between snapshots, not rounded windows. Posts/day is measured from the community’s own newest posts on Reddit, not from what Prowlo happens to crawl.
Member growth
What works in r/3Dprinting
Every post in a recent sample, labelled by format. Share is how much of the sample used that format; average score is how it performed.
| Format | Share of posts | Avg score |
|---|---|---|
| Show & tell | 57% | 10,008 |
| Discussion | 15% | 3,692 |
| Question | 11% | 1,105 |
| Rant | 7% | 9,054 |
| How-to | 7% | 1,197 |
| Promo | 4% | 27 |
Based on 74 posts sampled in September 2026. A sample, not the full history.
- Median score
- 3,576
- Top 10% score
- 18,524
- Text posts
- 12%
- Got no replies
- 7%
- Busiest windows
- Tue 22:00 UTC, Tue 19:00 UTC
Posting rules, in plain words
Self-promotion is allowed at a ratio — contribute before you post about yourself. Promotion goes in Monthly Purchase Advice Thread (Monthly, stickied to the top of the subreddit). Post flair is required.
- Self-Promotion: Self-Promotion content can only be posted 14 days for free models and 30 days for paid models after your last self-promotion post. Specific other restrictions also apply, that you can read about in the full rules below.
Quoted from the community’s own published rules. Always re-read them before posting.
What a good comment looks like here
- — Directly answers the original post's question or addresses its premise.
- — Provides specific technical details or explanations (e.g., material, settings, design choices).
- — Uses humor or relatable anecdotes.
- — Offers constructive criticism or alternative solutions.
- — Engages in playful banter or community in-jokes.
What r/3Dprinting's rules say about promotion
1 of 9 published rules mentions promotion, advertising or spam. Quoted from the community's own rules page, not summarised.
Self-Promotion
rule 3 of 9
Self-Promotion content can only be posted 14 days for free models and 30 days for paid models after your last self-promotion post. Specific other restrictions also apply, that you can read about in the full rules below. This is an overview. Full rules: https://www.reddit.com/r/3Dprinting/wiki/communityrules/
Removal reason shown to posters: self-promotion rule violation
The other 8
- Posts must be 3D-printing-related
- Requests for purchase advice must go in the stickied megathread
- No Dangerous or Malicious Devices or Instructions
- Community Behavior
- Specific Day-Limited content
- Other content restrictions
- No Karma/Repost Bots
- No Linking to Restricted Websites
Read from r/3Dprinting’s published rules on Sep 2. Communities change their rules without notice and enforce requirements (karma, account age, flair) that may live in the sidebar or automod rather than here — the source page is the authority.
Similar by content
Communities that discuss what r/3Dprinting discusses.
A place to discuss all things 3D Printing related! This sub is community driven and aims to be a place to express ideas and grow together in this amazing hobby. Happy printing!
/r/3DPrintFarms is a community for anyone interested 3D printing for business and mass-production. Share photos of your print farm, ask for advice, share your print farm tips and tricks, show off your prints and share your knowledge with others!
A community for discovering, reviewing, and discussing tools that make 3D printing easier.... apps, slicers, calculators, diagnostics, and everything in between. Share what's working for you.
A community dedicated to share and discuss 3D prints that have a specific, practical function or use in everyday life.
See the full lists on similar subreddits.
r/3Dprinting — frequently asked
How many members does r/3Dprinting have?
r/3Dprinting has 3,423,425 members as of our most recent crawl on Sep 9. Prowlo re-checks tracked communities on a rolling schedule, so this figure moves rather than sitting frozen at whatever it was when a scraper last ran.
Is r/3Dprinting growing?
Over the last ≈33 days r/3Dprinting changed by +0.5% — a gain of 19K members. We compare against the nearest snapshot we actually hold and state the real span rather than rounding it to a clean "30 days".
How active is r/3Dprinting?
We don't have a reliable posting-rate sample for r/3Dprinting yet. Subscriber count alone is a poor guide to whether a community is active, so treat this one as unverified until the next sample lands.
When was r/3Dprinting created?
r/3Dprinting was founded in March 2010 and is a public — anyone can post community. Age matters: an older community with steady growth has survived Reddit's moderation churn; a young one with a spike may not.
Can I promote my product in r/3Dprinting?
r/3Dprinting publishes 9 rules and 1 of them addresses promotion. The first, “Self-Promotion”, says: Self-Promotion content can only be posted 14 days for free models and 30 days for paid models after your last self-promotion post. Specific other restrictions also apply, that you can read about in the full rules below.… Read the full rule text on this page and the community's rules page before posting — moderator enforcement is the thing that actually decides.
How do I monitor r/3Dprinting for mentions?
Hit Watch on this page. Prowlo starts crawling r/3Dprinting into your Dataset — every new post indexed and embedded, searchable semantically, queryable by your AI agent over MCP, and able to trigger keyword alerts in Slack. Prowlo is read-only; it never posts on your behalf.
Can my AI agent read r/3Dprinting's stats?
Yes. Everything on this page is one MCP tool call away: catalog_get_subreddit returns r/3Dprinting's members, growth, promo tolerance and similar communities as typed JSON — free, no credits. Connect your agent to api.prowlo.com/mcp and it can vet the community and start watching it in the same conversation.
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