r/3Dprinting: rules, audience and how brands can post there
3,458,576 members. Self-promotion allowed? Yes, limited. Every 14 days (free) or 30 days (paid).
r/3Dprinting has about 3.5 million members, from beginners to people developing 3D printed parts. Self-promotion is allowed, but only every 14 days for free models and every 30 days for paid ones. Sharing 3D printing software for feedback or beta testers is banned.
Paste your draft on the next page. We flag likely self-promotion and rule problems before you post.
- Members
- 3,458,576
- Self-promotion
- Yes, limited. Every 14 days (free) or 30 days (paid)
- Created
- 2010
- Checked
- November 13, 2026
What r/3Dprinting is
/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.
Model designers, and hardware or filament brands whose staff take part as makers. Software makers can't promote here.
Can a brand post in r/3Dprinting?
Under the self-promotion rule, you can post your own content again 14 days after your last self-promotion post for free models, or 30 days for paid models. The rule points to the full rules on the wiki for other limits, and the submit text sums it up as less than 10% self-promotion. A separate software rule bans asking for beta testers or feedback on 3D printing software, including inventory systems, cost calculators, print management and CAD tools. Purchase advice goes in the stickied monthly thread. Links to restricted websites get removed, and AI-generated content or models, crypto and NFTs aren't allowed. Memes are for Mondays only.
What works
- Sharing a model you designed, spaced out by the 14 or 30 day limit
- Keeping self-promotion under 10% of what you post, as the submit text asks
- Answering printing questions from real experience
- Buyer questions in the stickied monthly purchase advice thread
What gets removed
- Self-promotion posted before the 14 or 30 day gap is up
- Requests for beta testers or feedback on 3D printing software
- Links to restricted websites, including disguised references to them
- AI-generated content or models, and crypto or NFT posts
The rules, summarised
- 1. Posts must be 3D-printing-related
All posts must be about a 3D printer, something that is 3D printed, or the 3D Printing industry. This is an overview. Read the full rules here: https://www.reddit.com/r/3Dprinting/wiki/communityrules/
- 2. Requests for purchase advice must go in the stickied megathread
- Don't make new threads when asking what printer to buy, they will be removed. Instead use the Monthly Purchase Advice Thread that is stickied to the top of the subreddit This is an overview. Read the full rules here: https://www.reddit.com/r/3Dprinting/wiki/communityrules/
- 3. 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. This is an overview. Full rules: https://www.reddit.com/r/3Dprinting/wiki/communityrules/
- 4. No Dangerous or Malicious Devices or Instructions
No Dangerous or Malicious Devices or Instructions: No posting, sharing, or linking to files or designs for dangerous devices (e.g., firearms, explosives). Non-functional cosplay or toy weapons are allowed if not resembling real firearms. Do not provide instructions to create dangerous devices. Ethical discussions are allowed, but no specific instructions. This is an overview.
- 5. Community Behavior
People have off days. Jerks will be ignored and down-voted. But if someone is continually being disruptive to the community in multiple threads (aka trolling), they will be banned at the mods' discretion. This includes bypassing blocked links or services via for example link shorteners, which is against Reddits Terms of Service to begin with. This is an overview.
- 6. Specific Day-Limited content
We only allow memes to be posted here on mondays, as we end up with too many and they drown out all other discussions. Showing off first layers is only permitted on First Layer Friday, Spaghetti only on Spaghetti Saturday. Both of these topics get spammed way too often otherwise and are too repetitive in nature. This is an overview. Read the full rules here: https://www.reddit.com/r/3Dprinting/wiki/communityrules/
- 7. Other content restrictions
Specific other content is also restricted, for example (but not limited to): Anything regarding cryptocurrency / NFT AI generated content or models Reddit ToS restricted content This is an overview. Read the full rules here: https://www.reddit.com/r/3Dprinting/wiki/communityrules/
- 8. No Karma/Repost Bots
This one is pretty obvious but we have to add it as a rule to get the applicable report reason for users so they can report Karma Bots reposting other people's content better and we can discern these posts faster.
- 9. No Linking to Restricted Websites
Do not post links to restricted websites or attempt to circumvent this restriction with partial URL strings, the use of subtle hints, etc., to reference models from these sites. For transparency, a list of restricted sites is available, explaining why these sites are restricted.
- 10. Software
Due to a recent influx of low-effort posts, asking for "beta testers", feedback or similar sharing of 3D printing related software is not allowed. This includes but is not limited to: inventory management systems, cost calculators, print management software, modelling/CAD software, etc... This is an overview. Read the full rules here: https://www.reddit.com/r/3Dprinting/wiki/communityrules/
Source: the community's own rules page, read on November 13, 2026. Rules change, so check the page before you post. See also the 9:1 rule.
Frequently asked questions
Can I promote my 3D models on r/3Dprinting?
Yes, within limits. You can self-promote again 14 days after your last self-promotion post for free models, or 30 days for paid ones.
Can I share 3D printing software on r/3Dprinting?
No. Asking for beta testers or feedback, or sharing 3D printing software in similar ways, is not allowed, whether it's an inventory system or a CAD tool.
Want help earning a place in r/3Dprinting?
30-minute intro call with a partner. If we're not the fit, we'll tell you in the first five minutes.
We take on 3 new engagements per quarter. Serious teams only.