About r/3Dprinting
In its own words:
/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.
Community guide
r/3Dprinting (#299, about 3.5 million) is for makers learning and discussing 3D printing and printed parts. Rules require 3D-printing relevance; purchase advice goes to the sticky megathread; <10% self-promo; ban dangerous/malicious devices/instructions; meme day is Monday; First-layer Fridays / Spaghetti Saturdays; no karma bots; no restricted-site links. Gallery/Text (~216.4 ppd).
Printing projects and troubleshooting
Prints, calibration, and maker talk fit; buy-advice belongs in the megathread.
Weekday meme/spaghetti gates
Memes only Monday; enjoy First-layer Friday / Spaghetti Saturday traditions; no dangerous device instructions.
Practical pointers
High gallery/text/image volume; Project/Question/Troubleshooting flairs.
SubMouse Editorial
The community was created on Mar 4, 2010, which makes it 16 years old. Since Oct 26, 2026, it has gained 3,949 subscribers (+0.12%). It sits just behind r/techsupport (#297) and ahead of r/writing (#300) in our ranking.
What sets r/3Dprinting apart
For its size it is unusually busy: about 62.7 new posts a day per million members, more than 96% of the Top 100. It is also one of the faster-growing big communities: its 0.67% gain since Sep 19, 2026 beats 91% of the Top 100. Its rhythm is strongly tied to time zones: the busiest hour (18:00 UTC) sees about 3.4× as many posts as the quietest (06:00 UTC).
Subscriber growth
Between Sep 19, 2026 and Nov 2, 2026, r/3Dprinting climbed from 3,428,817 to 3,451,698 subscribers (+22.9K, +0.67%). That is about 520 new members per day. The chart uses our weekly snapshots (9 so far), so it gets longer every week.
What r/3Dprinting talks about
We read the titles of 700 recent posts (Oct 29–Nov 5), the words that come up most are “print”, “printed”, “printing”, “help” and “printer”. Other frequent themes are filament, halloween, designed, prints, looking and model. Recurring phrases include “bye bye”, “bye prusa”, “print file” and “bambu lab”. By format, 34% are galleries, 25% are text posts and 22% are images.
Popular post flairs: Project (186), Question (157), Troubleshooting (143), Free Model (63), Discussion (57), Print (model not provided) (36).
Activity and best time to post
r/3Dprinting gets about 220 new posts a day. The public archive holds 1,008,840 posts and 9,351,214 comments in total, about 9.3 comments per post. Last week the busiest day was Tuesday (234 posts) and the quietest was Friday (211). Posting peaks around 18:00 UTC and is lowest around 06:00 UTC.
Rules of r/3Dprinting
The moderators of r/3Dprinting list 9 rules. In short:
- Posts must be 3D-printing-related
- Requests for purchase advice must go in the stickied megathread
- Less than 10% self-promotion
- No Dangerous or Malicious Devices or Instructions
- Community Behavior
- Monday is Meme Day. You can only post Memes on Monday
- First layer Fridays, Spaghetti Saturdays
- No Karma/Repost Bots
- No Linking to Restricted Websites
How to join
Open reddit.com/r/3Dprinting and press “Join”. Read the community rules in the sidebar before you post: every subreddit is run by its own volunteer moderators.
Frequently asked questions
How many members does r/3Dprinting have?
r/3Dprinting has 3,451,698 subscribers (Nov 2, 2026), which makes it the #299 safe-for-work subreddit in the SubMouse ranking. It added 22,881 members between Sep 19, 2026 and Nov 2, 2026.
How old is r/3Dprinting?
r/3Dprinting was created on Mar 4, 2010, so it has been around for 16 years. The oldest post in the public archive is from Jan 20, 2011.
How active is r/3Dprinting?
Very active: r/3Dprinting gets about 220 new posts a day (average of the last four weeks). Over its lifetime the archive counts 1,008,840 posts and 9,351,214 comments. In a sample of 700 recent posts we counted 633 different authors.
When is r/3Dprinting most active?
Based on post counts from Oct 29, 2026 to Nov 4, 2026, the busiest day was Tuesday and the quietest Friday, and most posts arrive around 18:00 UTC, with the fewest around 06:00 UTC. More posts also means more competition, so a quieter hour can help a post get noticed.
What is r/3Dprinting about?
The community describes itself as: “/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.” Recent post titles often mention print, printed, printing, help and printer. Most posts are galleries (34%).
Is r/3Dprinting safe for work?
Yes. Reddit does not mark r/3Dprinting as an 18+ (NSFW) community. SubMouse lists safe-for-work subreddits only.
How do I post on r/3Dprinting?
Join the community on Reddit first, then use “Create post”. r/3Dprinting accepts both text and link posts, with images, videos, galleries and polls enabled. It has 9 posted rules, starting with: “Posts must be 3D-printing-related”; “Requests for purchase advice must go in the stickied megathread”; “Less than 10% self-promotion”. Moderators remove posts that break the rules, so read them in the sidebar before posting.
Which communities are like r/3Dprinting?
Communities with similar topics include r/WeAreTheMusicMakers (3.8M), r/popculturechat (6.7M), r/learntodraw (3.2M), r/nextfuckinglevel (10.5M) and r/GetStudying (3.3M).
Stats from public data (data updated Nov 2, 2026; activity, rules and archive totals via the Arctic Shift archive, Nov 6, 2026). Point and comment counts are archive snapshots and can be lower than on Reddit today. SubMouse is an independent directory and is not affiliated with Reddit or the moderators of r/3Dprinting.