Steam app 3667150 · updated 12 Sep 2026, 23:50 UTC
Become a master modeler in Mech Builder 3D. Experience the relaxing process of assembling, customizing, posing and displaying all the 61 model kits with complete freedom without ever losing a piece.
151 hourly samples, with the daily peak drawn over them. Weekends are shaded.
9 months, January 2026 to September 2026. The highest number of people in the game at once, each month, on a time axis -- a gap in the record stays a gap.
The highest number of people in the game at once, each month. Four, because four is as far back as the source keeps anything finer than one figure a month.
24 days, each one the highest figure that day. The source keeps no hourly detail this far back. Weekends are shaded.
25 days, each one the highest figure that day. The source keeps no hourly detail this far back. Weekends are shaded.
12 days as the curve, each the highest figure that day. Behind it, 115 hourly samples. Each dip is a night. Weekends are shaded.
Mech Builder 3D was released on 13 Jan, 2026.
| Language | Full audio |
|---|---|
| English | ● |
| French | |
| Italian | |
| German | |
| Japanese | |
| Simplified Chinese | |
| Spanish - Latin America | |
| Spanish - Spain | |
| Indonesian | |
| Portuguese - Brazil | |
| Portuguese - Portugal | |
| Vietnamese |
A blank audio cell means full audio was not marked in the returned language list.
17 achievements in total.
42 developer announcements, May 2025 to Aug 2026 · times in UTC
Now is your chance to get Mech Builder 3D and the DLC with 40% off.
Don PachiClick Build Repeat is an incremental game about building and collecting model kits. Get it with 20% off right now:
Don PachiClick Build Repeat is an incremental game about building and collecting model kits. It's a game I've been developing and it will be released in July, you can try the demo and add it to your wishlist:
Don PachiHere are the pictures of the winners, whose images will appear on the loading screens in today's patch along with their usernames (One will randomly appear on the loading screens).…
Don PachiFixed:Sometimes, in the main menu, the models are displayed with weapons of multiple save slots.
Patch notesPatch 1.4.6h:Fixed sometimes when you clicked next model it would open the save panel.Fixed the weapons becoming transparent and in a style they shouldn't have been.Fixed an issue where the model rotation in the main menu was sometimes…
Don PachiThis DLC contains 15 new models:5 Lagann modelsBelieve in the you that believes in yourself.5 Principality modelsMostly red colors and 3 times faster.5 Waifu modelsThick and slim. Obviously mechs, what were you thinking?
Don PachiThis DLC contains 15 new models:5 Lagann modelsBelieve in the you that believes in yourself.5 Principality modelsMostly red colors and 3 times faster.5 Waifu modelsThick and slim. Obviously mechs, what were you thinking?
Don PachiNow is your chance to get Mech Builder 3D with 30% off.
Don PachiPatch 1.3.1:The issue where some achievements (Half way, Model Meister) sometimes were not unlocking was fixed.
Patch notesPatch 1.3.0:In the main menu, after completing the tutorial, finished models can now be zoomed in and rotated when selected.Minor fixes
Patch notesPatch 1.2.0:It took some time, but what many were asking for has been added to the game:Undo buttonRedo button
Don PachiPatch 1.1.1:Fixed that some parts in kitbash could not be painted in parts mode.Fixed that some parts in kitbash could not be rotated.Fixed that some parts in kitbash were not affected by the paint styles.
Patch notesIt's simple: upload a photo of your Kitbash model to the Discord server here:https://discord.com/channels/1212580514977026161/1249535294168895598or the Steam page to participate:https://steamcommunity.com/app/3667150/screenshots/The…
Don PachiPatch 1.1.0:You can now use the eyedropper tool on the manual and on objects on the table to get the colors you want.The resolution of the texts in Japanese and Chinese was improved.
Patch notesPatch 1.0.9d:Problems with the color when you increase the brightness bar have been fixed.In kitbash mode, a problem that cancels the painting mode when rotating the model using a right click has been fixed.
Patch notesPatch 1.0.9b:Paint option buttons now working correctly in kitbash mode.Fixed the problem with the glow effect when painting while the all option was selection.Now when selection "all" you will also see the preview area.
Patch notesPatch 1.0.9:Paint option buttons added:PiecePartAllThis will make painting easier.*It still needs to be implemented in kitbash.
Patch notesPatch 1.0.8:More language added:PortugueseVietnameseIndonesian
Patch notesPatch 1.0.7:Heights are now displayed in the main menu.Axis and Lightarms weapons are now visible for equipping.Two rotation buttons have been added (x and y) have been added for easier manipulation.One button has been added to reset only…
Patch notesPatch 1.0.6:Fixed some kitbash pieces of Astro-M couldn't be rotated or painted.Mega-T kisbash pieces and more of that line now can be properly selected.
Patch notesPatch 1.0.5:When clicking the reset position, reset rotation and next models buttons now there will be a warning panel before proceeding.
Patch notesPatch 1.0.4e:Fixed some pieces appearing white in kitbash mode.Fixed issues with using decals.Fixed an issue where some pieces in kitbash weren't saving their color.
Patch notesPatch 1.0.4A new function has been added to the camera button:-Besides taking photos, you can now also record your model rotating in video format (.mp4).-Fixed some kitbash pieces with wrong rotations.
Patch notesPatch 1.0.3f:Fixed some Model 48 parts that couldn't be cut.Fixed Model 26 Kitbash parts that were being reversed.Fixed some Kitbash parts that were rotating incorrectly upon restarting.Resetting the position no longer destroys the…
Patch notesPatch 1.0.3eFixed missing parts on the wolf's hind legs and metal garurumon when painting.Fixed an issue where the left hand in a model's kitbash caused errors.Fixed an issue where some kitbash pieces were being placed in incorrect…
Patch notesPatch 1.0.2 Fixed:Correct tutorial panel was not showing up.Correct lore card when completing the model was not showing.Main room camera after completing the tutorial was in the wrong position.
Patch notesThanks for your patience, the main menu "bug" is solved now, please update your game.
Don Pachi🥳Happy to announce that Mech Builder 3D is now officially released.📢Get it with 20% off the first 1 week.
Don PachiPatch 0.5.1:You will gain access to the decal mechanic upon completing the 6th model. This will unlock the use of decals on all previous models.Minor fixes.Previously completed models have been reset.
Patch notesPatch 0.5.0:There have been reports that models 7 and 8 sometimes cause the game to freeze, so they have been removed until the issues are resolved. But its parts can still be used in kitbash mode.
Patch notesPatch 0.4.9:Fixed: In some cases, pose rotation points could not be activated in kitbash mode.
Patch notesPatch 0.4.0:Main mechanics reworked so know you now have more freedom to assemble the model.New models for you to try.You can now move all the cut pieces on the mat to arrange them the way you want.3D physics applied to all objects for more…
Don PachiPatch 0.3.0:New 3D nippers when cutting the runners.Pieces go directly to the mat to build the model, no more 2d buttons.The manual advances automatically when you complete the page.Now you can drag the manual window.New tutorials.Now you…
Don PachiPatch 0.2.4:Color buttons were replaced with a color wheel so you can choose the colors you like.New 4th style button for more realistic color builds.
Patch notesPatch 0.2.3:New buttons to control the height position of you modelNew favorite save slot button to display the one you want
Patch notesPatch 0.2.2:You can now drag and cut with just the left click.3D models and painting optimized to consume much less resources.Had to reset saves slots, sorry.
Don PachiPatch 0.2.1:For some people the style change buttons were not working, with this patch I hope it will be fixed for everyone.
Don PachiPatch 0.2.0:3 graphic style options when customizing your build.minor fixes
Don PachiPatch 0.1.3:Glow sliderColor picker buttonRotation type toggle buttonPreviously saved poses and colors have been reset to test steam cloud saveminor fixes
Patch notesNew demo is out:2 New modelsRework manuals and mechanicsSave and load statesBetter rotationsPreview of the painting areaPhoto modeNew animationsand more
Don PachiAdjust the snap distance between pieces. Auto rotate models in the main menu. Darken the background wall so it's not so white. Make the mouse scroll wheel only work on the game screen. Flash the parts that can be painted with the bucket.…
Don PachiEverything Steam lists as add-on content for this game, newest first. Prices are left out on purpose: the store answers this page in one currency and it is not the reader's.
| Name | Platforms | Released |
|---|---|---|
| Mech Builder 3D - DLC 1 | Windows | 31 Mar 2026 |
What Steam runs, and with what. Straight from the app configuration.
| Description | Executable | Arguments | Platform | |
|---|---|---|---|---|
| Launch | Mech_builder_3D_F1.exe | any |
It runs on public data and somebody's spare time.
https://paypal.me/KintaroPalPay[email protected]0x4d559C765AA8BFe336E36d5b76024926767eD38dTJtctWU9uetJaTBoSybd1RErW7n9duTKVG