A housing hinge has snapped and nobody sells that part on its own. A small pinion in a mechanism no longer catches. Your product prototype works perfectly on screen, but you have no idea how it behaves once the parts are assembled in your hand. Those three projects share one thing: they aren't decorative objects, they are parts that have to fit exactly. That is precisely what resin printing is for.
What counts as a precision part
We talk about a precision part when the function depends on the fineness of the geometry rather than on the volume of the object. A small shim with a well defined recess is a precision part. A large flower pot is not.
A micro-mechanism is something else again: an assembly of small parts that move relative to each other, such as gears, cams, slides, clips and hinges. Everything there plays out in gaps invisible to the naked eye. If the relief on a pinion's teeth isn't rendered cleanly, the mechanism doesn't turn. There is no partial success.
Two processes, two playing fields
3D printing splits into two main families, and choosing the right family matters more than anything else.
FDM (fused filament deposition, a process where the object is built layer by layer from a melted plastic thread) is our tool for everyday objects, spare parts and projects that need volume. It works with materials whose behaviour is well understood: PLA for décor and figurines, PETG when mechanical strength is needed, TPU for flexible parts, Nylon for technical uses.
Resin printing works differently: it cures a liquid resin with great precision. It's the high-definition process, the one we choose for prototypes, precision technical parts and micro-mechanisms. If you want the full comparison of the two processes, we've devoted a dedicated article to it: resin or filament printing, how to choose.
The projects that call for resin
Four families of requests come up regularly at the workshop.
The prototype you need to validate
You've modeled a product and you want to hold it before committing to anything. A resin printed part lets you check what no 3D render can show: does the clip actually snap in, does your hand sit right on the handle, do the two halves close without play.
The precision technical part
Guides, drilling jigs, instrument mounts, adapters between two things that were never designed to go together. These parts often have no aesthetic value at all, but they have to respect an exact geometry to be of any use.
The micro-mechanism
Gears, toothed wheels, locking systems, small articulations. It's the most demanding category, and the one where high definition changes everything.
Models and scale work
An architectural detail, a model railway component, a diorama element. Here the level of detail matters more than ruggedness. If your project leans more towards a bust or a character, our article on resin printed figurines covers that case specifically.
Resin or FDM: the question gets settled at quoting time
This is the most important point in this article, and the most widely misunderstood. The right process isn't deduced from the size of the part, but from what you'll actually do with it.
A part meant to take repeated loads, to be handled every day or to live outdoors doesn't follow the same reasoning as a validation prototype or a demonstration mechanism. Rather than deciding for you, we look at your file and your real use case, then tell you what seems most sensible to us. Quite often the answer turns out to be FDM with a technical material, and we say so. Our article on TPU and Nylon goes into those cases.
What you send us
A print always starts from a 3D file. We accept STL, OBJ and 3MF, either as a direct file or as a link to your model. If you're unsure which format to send, our guide to STL, OBJ and 3MF sorts it out in a few minutes, and the one on preparing an STL file saves you the most common mistakes.
Two points are worth stating plainly. Your files are never shared or reused without your agreement, which on a product prototype is no small thing. And you remain responsible for the rights on the files you send us, whether they come from a purchase, a download or your own modeling.
What if the part already exists
A frequent case: you have no file, you have a broken part in your hand. A small mechanism from a household appliance, a furniture hinge, a lug from a toy nobody makes any more. That's the territory of our plastic part repair service, and we recount several of those rescues in our article on 3D printed spare parts.
Get your part quoted
The price of a precision part depends on its size, its complexity, the number of copies and the finish you want. Two parts with identical dimensions can represent two very different jobs, so rather than throwing out a figure that wouldn't help you, the simplest route is to show us your project.
Send your file from our resin printing page and get a free quote, with no obligation. You can also go through the workshop form if you're still hesitating between processes: we'll point you in the right direction, including towards our on-demand 3D printing service if FDM suits your need better. And if you're in the Moselle area, collection in person at Vatimont is possible, coffee included.
Frequently asked questions
What's the concrete difference between resin and FDM on a small part?
Resin printing cures a liquid resin with great precision: it's the high-definition process, the one for prototypes, precision technical parts and micro-mechanisms. FDM builds the part from melted filament and covers everyday objects and spare parts. On a small part, the choice comes down to intended use, not to size.
Can I have several versions of the same prototype printed?
Yes. Send each version as a separate quote request, mentioning that it's an iteration: we'll know what we've already printed for you and what the change is about.
Do my prototype files stay confidential?
Yes. Your files are never shared or reused without your agreement.
Which file format should you receive?
STL, OBJ or 3MF, as a direct file or as a link to your model. If you have any doubt about whether your file is valid, send it with your request: we check it before replying.