Every physical LEGO builder has a parts system. Maybe it is a wall of labeled drawers. Maybe it is a set of sorted bins on a folding table. Maybe it is a massive unsorted pile that you dig through with both hands, hunting by feel for that one 1x2 plate with a rail. However you organize your physical bricks, you have a system, and the speed of your building depends entirely on how well that system works. The same is true in Stud.io.
The parts panel is Stud.io's equivalent of your parts drawers. It sits on the left side of the interface, and it contains every single LEGO element that BrickLink has catalogued — over 90,000 individual part designs across hundreds of categories. That number is both a miracle and a problem. A miracle because you will never be limited by what you own. A problem because finding the exact part you need in a library that large can feel like searching for a specific grain of sand on a beach. Unless you know the tools.
This guide covers every method Stud.io offers for finding parts: text search, part number lookup, category browsing, color filtering, the favorites system, recently used parts, custom palettes, and importing unofficial elements. By the end, you will be able to locate any part in the entire library in under five seconds. That is not an exaggeration. It is what happens when you learn to use the panel properly. If you are new to Stud.io entirely, start with the What is Stud.io overview first, then come back here once you have the software installed and open.
Open Stud.io and look at the left side of your screen. The parts panel occupies roughly one-fifth of the window by default, though you can resize it by dragging the divider. At the top is the search bar. Below that is the category tree. Below that is the parts grid, which displays thumbnails of every part matching your current search or category selection. At the bottom is the color selector. These four zones work together as a filtering pipeline: each one narrows the results until you are looking at exactly what you need.
The panel has two modes that most beginners never discover. The default mode shows the full BrickLink parts catalogue organized by category. The second mode — toggled by clicking the small icon near the search bar — shows only the parts used in your current model. This "model parts" view is invaluable when you are deep into a build and want to reuse an element you have already placed without remembering its name or number. Click on any part in the grid to select it, and it becomes your active placement tool. Right-click for additional options like adding to favorites or viewing the part on BrickLink directly.
The panel also responds to keyboard shortcuts. Pressing the forward slash key (/) jumps your cursor directly to the search bar from anywhere in the application. This single shortcut will save you hundreds of mouse movements per session. Learn it. Use it. Let it become reflex. The fastest builders in the Stud.io community rarely touch the search bar with a mouse — they slash, type, select, and place in one fluid motion.
The search bar at the top of the parts panel accepts plain-text queries and returns results in real time as you type. Type "plate" and you will see every part with "plate" in its name. Type "plate 1x2" and the results narrow to 1x2 plates specifically. Type "plate 1x2 with" and you get the modified variants — plates with rails, handles, clips, hinges, and every other attachment LEGO has ever put on a 1x2 plate. The search is fast. On a modern computer, results appear before you finish typing the second word.
Name searching works best when you know the BrickLink naming conventions. BrickLink part names follow a specific grammar: the base element type comes first (Plate, Brick, Tile, Slope), followed by dimensions (1x2, 2x4, 1x1), followed by modifiers (with Handle, with Clip, Modified, Inverted). Learning this grammar lets you construct precise queries. If you are searching for a bracket — the L-shaped piece that lets you build sideways — searching "bracket 1x2" returns all 1x2 bracket variants immediately. If you want a brick with a stud on the side for SNOT building, search "brick 1x1 with stud" and there it is.
The search also handles partial matches, so you do not need to type the complete part name. "Hinge" finds all hinge-related parts. "Arch" finds arches. "Wedge" finds wedge plates, wedge bricks, and wedge slopes. When a search returns too many results, add another word to narrow it down. When it returns too few, delete a word to broaden it. The search bar is forgiving — there is no wrong query, only queries that need refinement. Think of it as a conversation with the catalogue. You ask, it answers, you refine, it answers again. Within two or three exchanges, you always find what you need.
Every LEGO element has a unique part number, and Stud.io's search bar accepts these numbers directly. Type "3023" and you get the 1x2 plate. Type "3003" and you get the 2x2 brick. Type "54200" and you get the 1x1 cheese slope that landscape builders cannot live without. Part number search is the fastest possible lookup method because it returns exactly one result — no browsing, no filtering, no narrowing. You type the number, and the part appears.
The challenge, obviously, is knowing the part numbers. Nobody memorizes all 90,000. But experienced builders do memorize their most-used parts, and you will too. After a few months of regular building, numbers like 3024 (1x1 plate), 3070 (1x1 tile), 3069 (1x2 tile), 4073 (1x1 round plate), and 85984 (1x2 slope) will be as familiar as your phone number. The Parts Lab is a good place to start building that mental catalogue — it breaks down essential parts by function and includes the BrickLink numbers for each one.
Where do you find part numbers for pieces you do not know? Three places. First, BrickLink's catalogue — search by description or browse by category, and the part number is displayed prominently on every part page. Second, the physical LEGO elements themselves — most parts manufactured since the 2000s have tiny mold numbers embossed on them. Hold the piece up to a light and look for the number. Third, other people's builds. When you download a Stud.io file from the community, you can click on any part in the model to see its number in the properties panel. Over time, your part number vocabulary grows organically. Every number you learn is a future search you will complete in under one second.
Sometimes you do not know what you are looking for. You know you need "some kind of curved piece" or "a hinge that does this specific thing" but you do not have a name or a number. This is where category browsing saves you. The category tree in the parts panel organizes the entire library into a logical hierarchy: Bricks, Plates, Tiles, Slopes, Technic, Minifigure Parts, Windows, Doors, Wheels, and dozens more. Click a category to see every part it contains. Click a subcategory to narrow further.
The category system mirrors BrickLink's catalogue structure, which means anything you learn about navigating categories in Stud.io transfers directly to shopping on BrickLink. The "Plates, Modified" category, for instance, contains plates with clips, handles, teeth, bars, and hinges — every plate variant that is not a standard rectangular plate. Browsing this category for five minutes teaches you more about what is available than a dozen targeted searches. Similarly, the "Bricks, Modified" category reveals parts you did not know existed — bricks with grooves, bricks with log profiles, bricks with masonry texture, headlight bricks, and dozens of specialized connectors.
A browsing habit that pays enormous dividends: once a week, pick a category you have never explored and scroll through it. Look at every part. Click on the ones that intrigue you. Place a few in an empty model just to see how they behave. The builders who create the most innovative MOCs are almost always the ones with the broadest knowledge of what parts exist. You cannot use a part you do not know about. Category browsing is how you expand your vocabulary, and a larger vocabulary means more creative options for every build. When you find parts you want to source physically, the BrickLink Wanted Lists guide shows you how to turn your digital discoveries into real orders.
At the bottom of the parts panel sits the color selector — a grid of every color LEGO has ever produced. Clicking a color filters the parts display to show only parts that exist in that color. This is one of Stud.io's most powerful features, and it solves one of digital building's biggest problems: designing with parts and colors that do not actually exist together in the real world.
Every LEGO part is manufactured in a specific set of colors. A 2x4 brick exists in dozens of colors. A specialized Technic beam might only exist in black and light bluish gray. When you design in Stud.io without color filtering, you can place any part in any color — including combinations that were never produced. This matters if you ever want to build your digital creation with real bricks. A model full of parts in colors that do not exist is a model that cannot be built. Color filtering prevents that problem by showing you only the combinations that are real.
There is also a "Common Colors" toggle that reduces the color palette to the most widely available shades. Use this when you want to ensure maximum buildability. If you are designing something you plan to order through BrickLink, the color filter is essential — it tells you upfront which colors your design is achievable in. For purely digital renders where buildability does not matter, you can ignore color filtering entirely and paint your model in whatever colors look best. The choice between "build-realistic" and "render-beautiful" is yours, but knowing how to toggle between them is a core Stud.io skill. For builders who like to keep physical collections organized alongside their digital ones, the LEGO sorting guide covers strategies for color-based and category-based organization systems.
After a few weeks of building in Stud.io, you will notice that you reach for the same fifty or sixty parts over and over again. The 1x2 plate. The 2x4 brick. The 1x1 tile. The cheese slope. The jumper plate. These are your core vocabulary, and searching for them every time you need one is a waste of motion. The favorites system eliminates that waste entirely.
Right-click any part in the parts panel or in your model and select "Add to Favorites." That part now lives in your Favorites section, accessible with a single click on the star icon in the parts panel. You can add as many parts as you want. Organize them by dragging and dropping within the favorites list. Remove parts you no longer need by right-clicking and deselecting the favorite option. Your favorites persist across sessions and across projects — they belong to your Stud.io installation, not to any individual file.
The strategic approach to favorites is to build your list gradually based on actual usage rather than trying to populate it all at once. Every time you find yourself searching for the same part for the third time in a session, add it to favorites. After a month of building, your favorites list will be a perfectly curated toolkit that reflects your personal building style. A spaceship builder's favorites will look nothing like a castle builder's favorites, and that is exactly the point. The system adapts to you. If you are working on a project that requires a lot of BrickLink sourcing alongside your digital design, keep the Wanted Lists guide handy — your Stud.io favorites often map directly to your most-wanted physical parts.
Adjacent to favorites is the "Recently Used" section, which tracks the last parts you placed in your current session. This feature solves a specific and extremely common problem: you place a part, build something around it, then need another one of the same part five minutes later. Without recently used tracking, you would need to remember the part name or number and search for it again. With it, you click the clock icon and there it is, sitting at the top of the list exactly where you left it.
Recently used parts are sorted chronologically, with the most recently placed part at the top. The list typically holds the last twenty to thirty unique parts, depending on your Stud.io version. It resets when you close the application, which distinguishes it from favorites — recently used is for the current session's workflow, while favorites is for your permanent toolkit.
Power users combine recently used parts with a specific workflow pattern. They begin a building session by placing one of each part they expect to need, creating a "staging row" off to the side of their main build. This front-loads the search effort into the first minute of the session, and from that point forward, every part they need is available in the recently used list. When the build is finished, they delete the staging row. It sounds like extra work, but it eliminates dozens of mid-build searches and keeps you in creative flow instead of administrative mode. Flow state matters — every search that pulls you out of building is a small interruption that accumulates into significant lost time over a long session.
Favorites are personal and persistent. Recently used parts are session-based and automatic. Custom part palettes fill the gap between them — they are project-specific part collections that you create, name, save, and share. Think of a palette as a curated parts bin for a specific type of build. You might have a "Castle Walls" palette with all your masonry-textured bricks, arch elements, and gray tones. A "Spaceship Greebling" palette with grille tiles, vent pieces, and mechanical detail parts. A "Microscale City" palette with 1x1 elements in architectural colors.
To create a custom palette, use the palette manager accessible from the parts panel menu. Give it a name, then add parts by right-clicking and selecting "Add to Palette" with the target palette chosen. You can also create palettes by selecting multiple parts in your model and adding the selection as a group. Palettes save as part of your Stud.io user data and can be exported as files to share with other builders. This sharing capability is underused in the community — a well-built palette from an experienced castle builder, for instance, could save a newcomer hours of part discovery time.
The real power of palettes emerges when you combine them with color filtering. Load your "Castle Walls" palette and filter by dark bluish gray — now you are looking at exactly the parts and colors you need for a specific wall section, with zero noise from the rest of the 90,000-part library. This combination of palette plus color filter is the closest Stud.io gets to having a perfectly organized parts drawer sitting open in front of you with exactly the right pieces for your current task. For builders who work across multiple themes, maintaining three or four well-curated palettes is one of the highest-impact productivity investments you can make.
The standard Stud.io library covers every part that BrickLink has catalogued, which is nearly everything LEGO has ever produced. But "nearly everything" is not "everything," and there are cases where you need a part that is not in the default library. Perhaps it is a brand-new element that has not been catalogued yet. Perhaps it is a third-party part from a custom manufacturer. Perhaps it is a part you designed yourself. Stud.io supports all of these through its custom parts import system.
Custom parts for Stud.io are typically distributed as .dat files in the LDraw format — the open standard for LEGO part geometry that predates Stud.io by decades. The LDraw community maintains an unofficial parts library alongside the official one, containing thousands of parts in various stages of review. To import an LDraw part into Stud.io, place the .dat file in Stud.io's custom parts folder (found under Stud.io's application data directory) and restart the application. The part will appear in a "Custom Parts" category in the parts panel. Some community members also distribute parts as Stud.io-native custom elements, which import through the application's built-in import dialog.
A word of caution about custom parts: they are not guaranteed to be geometrically accurate, and they will not appear on BrickLink or in any bill of materials export. Use them for conceptual design, rendering, or models you do not intend to build physically. For builds you plan to construct with real bricks, stick to the official library. The official parts are verified against actual LEGO molds and their BrickLink entries link directly to purchasing options. If you are planning to take your digital designs and source the physical parts, the BrickLink beginner's guide covers the entire process from catalogue search through store checkout.
Even with all the tools described above, some parts are genuinely hard to find. The LEGO catalogue is vast and naming conventions are inconsistent. A piece you think of as a "bracket" might be listed as a "plate, modified" or an "angle plate." A piece you call a "grille" might be catalogued as a "tile, modified" with a "grille" modifier in the description. When your first search fails, do not assume the part does not exist. Assume you are using the wrong term and try alternatives.
The BrickLink cross-reference technique deserves special emphasis. BrickLink's website has a more flexible search engine than Stud.io's built-in one, including visual search tools that let you identify parts by shape. When you are truly stuck — you can picture the part but cannot name it — go to BrickLink, browse the relevant category visually, find the part, note its number, and type that number into Stud.io. This roundabout method is faster than scrolling through hundreds of parts in Stud.io's grid view. The BrickLink beginner's guide covers the site's navigation in detail.
Another technique for obscure parts: look at official LEGO sets that use the piece you need. If you know that a specific set contains a rare element, search for that set's inventory on BrickLink. Every part in every set is listed with its part number. Find the number, paste it into Stud.io, done. This set-inventory approach is particularly useful for printed and decorated elements, which are catalogued with separate numbers from their unprinted base parts and can be nearly impossible to find through text search alone.
Finally, remember that the Stud.io community is a resource. Forums, Discord servers, and Reddit communities dedicated to Stud.io and digital LEGO building are full of experienced builders who have already solved the "where is this part" problem hundreds of times. A quick question with a description of what you are looking for will usually get you an answer — with the part number included — within minutes. Building is a community activity, even when you are building alone at a screen. Visit the Builds hub for inspiration, check the Reviews for set-specific part discoveries, and explore the Parts Lab for deep dives into essential elements.
A library of 90,000 parts is not a burden. It is a superpower. You just need to know how to search it. Now you do.
Ready to source the real-world bricks for your designs? Shop all-new sets on LEGO.com and build your physical collection alongside your digital one.