Hey everyone, it’s Mia from your go-to resin jewelry charms supplier—y’know, the one who’s always geeking out over mixing resin batches at weird hours and testing every new trick we can get our hands on. Today I’m answering a question I’ve gotten at least a dozen times in the last month from makers and small boutique owners alike: Can I actually make resin jewelry charms with 3D printed elements? Spoiler alert: Yes, you absolutely can—so long as you do it right. I’ve been testing this combo for our own inventory for six months now, and I’m here to spill all the messy, practical details (no fancy lab jargon, promise). Resin Jewelry Charms
First, let’s talk why this combo is such a game-changer for resin charms. 3D printing lets you make way more unique, intricate shapes than you could ever carve by hand or cast from a mold quickly. Think tiny constellation dots with micro craters, mini succulent figurines with perfectly ruffled leaves, even custom initials with delicate script that’d break if you tried to mold it. And resin? That’s the stuff that makes those 3D printed bits pop—adds a glassy, durable finish, seals any rough edges, and lets you layer in color, glitter, or even embedded small things like dried flower petals or micro beads. It’s not some random trend either; we’re seeing so many of our wholesale clients sell this exact hybrid style like hotcakes. One boutique in Portland told us they sold out of their half-moon charms with 3D printed star tips and a clear resin coating in 48 hours last month.
But here’s the thing—you can’t just yank a 3D print out of your printer, squirt resin on it, and call it a day. I learned that the hard way back in February when I tested a batch of 50 tiny flower charms. I used cheap PLA filament, printed them, washed them off, and poured on the resin. Within two days, half of them had big bubbles under the resin, and three of the smallest petals just flaked off into the resin. Total disaster. So I spent months troubleshooting, testing different filament types, prep methods, and resin formulas, and now I’ve got a process that works 99% of the time (minus the occasional human error, like forgetting to sand a edge). Let’s break down what actually works, no fluff.
First up: choosing the right 3D printed material. Not all filaments are created equal, especially when they’re going to be paired with resin. Let’s start with what to avoid, because that’s what saved me from more waste. Cheap PLA is a no-go for full resin coverage. It’s super porous, so it soaks up resin like a sponge, and it can react badly with some resin types—too much moisture in the pores causes bubbles, and sometimes the two materials separate over time. I had a batch of 3D printed cat charms with cheap PLA that started peeling in a week, so that’s out. What works? PETG is my top pick right now. It’s not porous at all, it’s flexible enough that thin bits like tiny wings don’t snap, and it adheres way better to resin than PLA or even ABS. I’ve tested PETG prints that have had a full resin coat on them for six months, worn daily, and they still look like new. The other option is resin 3D prints, but that’s way more expensive for small batches, and you have to cure them super thoroughly (like, don’t skip the UV post-cure) otherwise they’ll leach into your resin and turn it cloudy. Stick to PETG for charms—trust me.
Next, 3D print settings that matter for resin adhesion. I used to print at super high layer heights to get detailed designs, but that made tiny ridges in the PETG that trapped air bubbles. Now I print at 0.15mm layer heights—still detailed enough for things like intricate leaves, but smooth enough that I don’t have to sand forever. Also, always use a brim for small charms, right? They’re tiny, so they warp when printing, and a brim gives you a flat base to work with. Just peel the brim off gently once they’re done, and you’re good to go. Oh, and skip the support material for parts that will be covered in resin. Supports leave weird marks that you have to sand off, and since the resin will cover those edges anyway, you don’t need ’em. I learned that too—wasted hours sanding support marks on a batch of heart charms once, never again.
Now the prep step, which is make or break. This is what fixed 90% of my early issues. First, give your 3D prints a good wash—wipe them down with isopropyl alcohol (70% or higher works) to get rid of all the filament residue and dust. Then, sand them lightly with 220-grit sandpaper, followed by 400-grit, to rough up the surface just a tiny bit. You don’t want them gritty, just not smooth. That micro-roughness is what makes the resin stick, like how you sand a wall before painting it. After sanding, wipe them down again with alcohol to get rid of all the sanding dust, then let them dry completely for at least an hour. Any leftover dust will show up as little spots in your final charm, and leftover moisture will cause bubbles. I keep a lint-free cloth just for this step—regular paper towels leave fuzz, so skip those.
Then, choosing the right resin. Not all resin mixes work with 3D printed elements. My go-to is a low-viscosity (thin) epoxy resin, not a thick, gel-like one. Thin resin flows into all the tiny crevices of your 3D print, so you don’t get air bubbles trapped there. I’ve tried high-viscosity resin, and it just sits on top of the PETG, leading to peeling later. Also, make sure it’s a resin that cures clear (unless you want it tinted, obviously) and is non-yellowing—no one wants a pretty charm that turns yellow after a month. We use a crystal-clear non-yellowing resin for our hybrid charms, and our customers love that it shows off the PETG details perfectly. One quick tip: if you’re adding glitter or pigment to the resin, mix it thoroughly before pouring, not after, so you don’t have clumps that show up under the 3D printed bits.
Pouring and curing tricks for no bubbles and no mess. When pouring resin over your 3D prints, start with a thin first layer—just enough to cover the top and small parts of the print—then gently tap the mold (or the charm, if you’re doing it without a mold) on the table a few times to release any tiny bubbles that get trapped. Then pour the rest of the resin slowly, just until the charm is covered completely. If you have bubbles that surface, use a heat gun or a butane lighter (hold it a few inches away so you don’t melt the PETG) to pop them. I also like to put my curing charms in a dust-free box for the first 12 hours, because even a tiny speck of dust landing on wet resin is a pain to fix later. Curing time matters too—follow the resin’s instructions, but I usually let ours cure for 24 hours before handling, just to be safe. Rushing it leads to soft, sticky resin that can peel or scratch.
Wait, can you do more than just cover the 3D print with resin? Totally! That’s where the fun part comes in. You can embed the 3D printed element partially in resin, so part of it is showing through clear resin, or layer different colored resins around the 3D print. I made a batch of 3D printed cactus charms last month where I put the cactus base in green resin, let that cure, then added a thin layer of clear resin over the top to cover the spines. They sold out in three days on our online shop. You can also add small details—like tiny resin flowers or metal beads—into the resin around your 3D print. The possibilities are endless, which is why hybrid charms are so popular right now.
I know a lot of makers worry about durability too—will these charms hold up? After six months of testing, wearing them myself daily, and sending test batches to other makers, I can say they’re pretty tough. They don’t chip easily, the resin doesn’t peel off, and the PETG doesn’t snap unless you really yank on it (and that’s on you, not the product). We do recommend sealing the edges with a clear topcoat if you want to make them extra durable, but I’ve found a good full resin coat is enough for everyday wear.
Now, let’s talk about common mistakes I still see people making, so you don’t have to learn the hard way like I did. First, using cheap filament. I’ve seen makers buy $5 filament rolls from Amazon, and 9 times out of 10 that leads to peeling or bubbles. Spend a little extra on reputable PETG filament—your charms will be way better. Second, skipping the sanding step. I can’t stress this enough—if you don’t rough up the 3D print surface, the resin won’t stick. Third, using thick resin. Thin resin is non-negotiable for getting into those tiny 3D printed details. And fourth, rushing the curing process. I’ve had batches where I pulled charms out after 12 hours, and the resin was still soft and sticky—they ended up smudging when I added jump rings. Patience pays off here.
For those of you thinking about scaling this, like we did, it’s actually really manageable. We have a few 3D printers running 24/7 making the little details, and we pour resin in batches every other day. We’ve streamlined the prep process so it takes us 5 minutes per batch of 20 charms, which is way faster than hand-carving every design. And since we’re a resin jewelry charms supplier, we even offer pre-made 3D printed elements for makers who don’t have their own printers. Just sayin’—if you want to skip the 3D printing part and focus on the resin, we’ve got you covered.
If you’re still on the fence, let’s talk cost. 3D printing small charms is way cheaper than hand-carving or machining them, especially for unique designs. The filament is like $20 a roll, and you can make hundreds of tiny charms from one roll. Resin is about $30 a gallon, so per charm costs are really low—meaning you can sell them for a good profit. One of our wholesale clients marks their hybrid charms up 300% and still has people lining up to buy them. That’s the kind of business win we all want.
Wait, I should also mention that this works for all kinds of charms—necklace charms, bracelet charms, even keychain charms. We’ve made mini 3D printed guitar picks with resin edges for band merch, and they were a huge hit. The key is matching the resin and 3D print to the use—keychain charms get a little extra resin to be durable, necklace charms can have thinner resin so they’re lightweight.
At the end of the day, this combo is all about combining the best of both worlds—3D printing lets you make unique, custom shapes quickly, and resin gives it that glossy, polished finish that makes charms feel special. It’s not some complicated, impossible process. If you take the time to pick the right materials, prep properly, and don’t rush the curing, you’ll get amazing results.
If you’re ready to try making your own hybrid resin and 3D printed charms, or if you’re a maker looking to stock up on pre-made elements or bulk resin, hit us up to chat. We can walk you through our recommended materials, share our pre-made design options, or even help you tweak a custom design for your shop. No question is too small—we’re all about helping fellow makers create stuff that sells.
Resin Charms REFERENCES
- ASTM International. (2020). Standard Guide for Selection of Filament Materials for Fused Deposition Modeling. ASTM F2924-20.
- Loos, A. C., & Springer, G. S. (1975). Cure Kinetics of Epoxy Resins. Journal of Applied Polymer Science, 19(10), 2699-2711.
- Gibson, I., Rosen, D. W., & Stucker, B. (2021). Additive Manufacturing Technologies: 3D Printing, Rapid Prototyping, and Direct Digital Manufacturing. Springer.
- Society of Plastics Engineers. (2019). PETG as a Substrate for Adhesive Bonding. SPE Adhesives Division Technical Report.
Shengzhou Shengteng Accessories Co., Ltd.
Address: Room 701, Building 23, Wanyang Innovation City, No. 368 Kaiya Road, Changle Town, Shengzhou City, Shaoxing City, Zhejiang Province
E-mail: 15869252296@163.com
WebSite: https://www.shengtengjewelry.com/
