East Coast RepRap Festival

If you’ve ever looked at a 3D printer and thought, “I could totally build one of those,” the East Coast RepRap Festival
(ERRF) is basically your Super Bowlexcept the halftime show is a table full of tool-changers, and the nachos are
probably made of PLA. It’s a maker-forward 3D printing gathering that grew from the RepRap ethos: open ideas,
shared improvements, and a community that loves turning “Wouldn’t it be cool if…” into “Here’s the GitHub.”

In recent years, the event has also been branded as 3DPrintopiasame heart, bigger footprint, and a clearer
message that it’s not only about RepRap-style machines anymore. It’s about the whole ecosystem: hobbyists, educators,
small businesses, big manufacturers, and the people who can explain input shaping without making your eyes glaze over.

What ERRF is (and why the name still matters)

“RepRap” is short for “replicating rapid prototyper,” a long-running movement in 3D printing that helped normalize
the idea that you should be able to understand, repair, and improve your own machine. ERRF started in 2018 and quickly
became a destination event for people who like their technology hands-on, community-driven, and a little bit daring.
The festival’s modern identity (3DPrintopia) reflects how wide the hobby has becomewhile keeping that RepRap spirit
alive: learn in public, share what works, and don’t gatekeep the fun.

Why this festival punches above its weight

It’s not just a trade showit’s a living lab

Traditional expos can feel like a lineup of polished product booths. ERRF-style events tend to feel more like a giant
working garage where everything is in beta (in a good way). You’ll see prototypes on tables, experimental motion
systems, custom firmware setups, and clever mechanical mods that people proudly show off because they solved a real
problem. It’s a place where “I designed this part at 2 a.m.” is not a confessionit’s a conversation starter.

The crowd is the feature

A big reason people travel for this event is the density of knowledge. You can watch a maker explain why they chose a
specific hotend for high-flow printing, then turn around and ask someone else how they tuned filament profiles for
PETG without stringing. In past years, coverage has described ERRF as a mix of B2B dealmaking, hobbyist showcasing,
and plenty of curious familiesmeaning you’re just as likely to meet a small startup founder as you are a teen showing
off a perfectly printed dragon.

What you’ll actually see on the show floor

Printers in every geometry (yes, even the ones that look illegal)

Expect variety: Cartesian rigs, deltas, belt printers, CoreXY machines, tool-changers, and the kind of custom builds
that make you whisper, “Wait… that’s allowed?” You’ll also see machines at wildly different scalesfrom compact
desktop printers to huge builds that exist specifically to make you question your life choices about available
workshop space.

Materials, motion, and the “parts buffet”

Filament brands and hardware vendors often show up with the newest spools, nozzles, extruders, hotends, build plates,
and motion components. The best part: you can talk to the people who build (or obsess over) the products. You can ask
practical questions like, “What’s the real-world difference between these two materials for outdoor parts?” and get an
answer that includes both science and scars.

Finished prints that stretch your imagination

ERRF isn’t only for people who want to tinker with machines. You’ll see 3D printed props, replicas, helmets, fashion,
cosplay, art pieces, instruments, toys, and functional problem-solverslike jigs, brackets, organizers, and repair
parts that quietly make everyday life less annoying. The show floor is proof that 3D printing isn’t one hobby; it’s a
hundred hobbies wearing the same nozzle.

Signature activities that make ERRF feel like ERRF

The 3D Printed Derby (Pinewood Derby energy, but with layers)

One of the most beloved recurring events is the 3D Printed Derby, which borrows the spirit of a Pinewood Derby
and replaces the wooden block with a design file and a slicer. Rules have emphasized a “show your layers” vibekeeping
things focused on what’s possible with additive manufacturing. It’s engineering, aesthetics, and trash talk, all in one
small vehicle.

If you’re thinking of competing, treat it like a miniature product development cycle: prototype early, test often,
and remember that weight placement, rolling resistance, and straight tracking can matter as much as a cool body shape.
(Yes, your gorgeous aerodynamic design can still lose to a brick if the brick rolls straighter.)

Death Racers and other chaotic-good spectacles

ERRF has featured crowd-pleasers like Death Racersradio-controlled, 3D-printed battle cars that lean into
dramatic, medieval-joust-meets-maker-lab energy. It’s the kind of event that reminds you why 3D printing is fun: because
people will absolutely use advanced manufacturing to build tiny combat vehicles, and nobody should stop them.

The Build Platform talks (where you level up fast)

Many attendees carve out time for the speaking stageoften referred to as The Build Platform. Talks tend to
span practical topics (design, slicing, materials, motion control, calibration) and community topics (open-source
development, education, inclusive maker spaces). Even if you think you “already know” something, you’ll usually leave
with at least one new trickand a list of things to try when you get home.

Community builds and meaningful moments

One of the most underrated parts of the festival is how it turns the community into a collaborative project. Past
coverage has highlighted emotional, large-scale community buildslike assembling hundreds of printed pieces into a
memorial project on-site. These moments feel very “RepRap” in the best way: a community showing what it can do when
it coordinates its skills and its printers.

How to get the most out of attending

Go in with a mission (but leave room for surprise)

If you arrive with zero plan, you’ll still have funbut you might miss your chance to ask the questions that would
save you three months of trial-and-error. A simple mission helps:

• Builder mission: Identify a reliable motion system + hotend/extruder combo for the speeds you want.
• Creator mission: Learn two new finishing techniques and pick one material to master this season.
• Practical mission: Find solutions for a specific pain point (warping, supports, PETG stringing, resin odor, etc.).

Questions that unlock great answers

Makers and vendors hear “What settings do you use?” all day. Instead, ask questions that reveal decisions:

• “What problem did this upgrade solve for you?”
• “What did you try first that didn’t work?”
• “If you rebuilt this printer today, what would you do differently?”
• “What material surprised youin a good or bad way?”

What to pack (so you’re not the person googling ‘blister prevention’)

• Comfortable shoes: This is not a “new boots” event.
• Phone battery plan: Charger, cable, power bankpick two.
• Notebook or notes app: You’ll collect ideas faster than you can remember them.
• A small tote or backpack: Swag, sample prints, and “I didn’t plan to buy this but here we are.”
• Earplugs (optional): Helpful if you’re sensitive to noise and crowds.

Show-floor etiquette that keeps the vibe excellent

The culture is friendly and curious. Still, a few basics go a long way: ask before handling someone’s print, don’t block
a booth while filming a ten-minute close-up of a nozzle, and give makers space to answer questions without turning it
into an interrogation. Also: compliment someone’s print genuinely and you may accidentally make a new friend for life.
This is how the hobby works.

If you can’t attend in person

The community tends to share a lot: recaps, photos, videos, and post-event writeups. Even from afar, you can learn what
products and printer designs are trending, what problems people are solving this year, and what techniques are becoming
standard practice. If you treat the event like a “state of the hobby” snapshot, you can still benefitespecially if
you’re deciding what to build, buy, or learn next.

Growth, rebranding, and what it signals for the future

ERRF’s evolution into 3DPrintopia isn’t just a name changeit’s a sign that the maker world is expanding. Reporting in
2025 noted that the event had outgrown its long-time community college arena footprint and planned a move in 2026 to the
Pennsylvania Convention Center in Philadelphia, with dramatically more space. Bigger venue usually means more
exhibitors, wider programming, and better traffic flowso you can spend less time shoulder-to-shoulder and more time
actually seeing the cool stuff.

The tradeoff of growth is always the same: you want to scale without losing the intimate, community feel. The good news
is that the “RepRap festival” model is resilient. As long as makers keep bringing their weird, brilliant buildsand the
event keeps making room for hobbyists alongside companiesthe magic tends to survive the square footage upgrade.

Quick FAQ

Who is this event for?

Anyone curious about 3D printing can enjoy it, but it especially shines for hobbyists, printer builders, educators,
designers, engineers, and small businesses. If you like learning by talking to real people who actually use the tools,
you’ll feel at home.

Is it beginner-friendly?

Yesif you’re willing to ask questions. You don’t need to know every printer acronym. You just need curiosity and a
willingness to say, “Explain that like I’m new,” because the best makers can do exactly that.

What makes it different from other 3D printing events?

The community emphasis. You’ll see a strong blend of personal builds and commercial products, plus hands-on activities
like derby races and maker challenges. It’s less “corporate keynote, please silence your phone,” and more “come look at
this ridiculous mechanism I made, it’s beautiful.”

Experiences: what a weekend at the East Coast RepRap Festival feels like (about )

The first thing you notice walking into an ERRF-style festival is the sound: a low, constant hum of fans, stepper
motors, and excited conversations layered on top of each other like a perfect three-wall print. It’s not loud in a
“concert” wayit’s loud in a “hundreds of people are enthusiastically comparing notes” way. You’ll hear someone say
“input shaping” and “pressure advance” in the same sentence, and nobody flinches. This is normal here.

You start off thinking you’ll do a quick lapjust to get oriented. Ten minutes later, you’re stuck (happily) at a table
where a maker is showing you a custom part that solved an annoying problem you didn’t know you could solve. They’ll
tell you the story: the failed prototype, the “okay, that was dumb” redesign, the slicer setting that finally made the
bridges behave. And you realize the best souvenirs from this event aren’t trinketsthey’re mental downloads.

Somewhere nearby, a crowd gathers. Not for a celebritythough in 3D printing, a well-known designer can absolutely draw
a linebut for something delightfully competitive: a 3D Printed Derby car that looks like it shouldn’t roll straight,
rolling straight anyway. People cheer for designs that are clever, not just pretty. Someone mutters, “That wheelbase is
cheating,” and everyone laughs because it’s half joke, half respect. You can practically feel the engineering instincts
switching on across the room.

The show floor is a mood board for your future self. You see printers that are impossibly clean, with cable management
so neat it deserves an award. You see printers that are obviously still in progress, wearing temporary zip ties like
battle medals. You see filament samples that make you want to print everything in your house in neon, and then you
remember you have bills and a limited number of shelves. Still, you take photos of the labels because maybejust
maybeyou’ll try that material next.

The best moments are often small. A stranger hands you a tiny printed part and says, “Here, this fixed my problemtry
it.” A vendor rep explains a feature without pushing a sale. A kid points at a cosplay helmet and asks how it was made,
and the maker answers with the kind of patience that builds future engineers. By the end of the day, your feet are tired,
your phone is full, and your brain is buzzing with ideas. You leave with that rare, satisfying feeling that you didn’t
just attend an eventyou joined a living community for a weekend.