1
Hobby & gaming
Gunpla HG action base adapter with 3 mm peg
A small saddle that lets High Grade Gunpla kits without a dedicated stand hole sit on a Bandai Action Base 4 or 5 arm. The arm ends in a 3 mm peg, so the adapter has a 3.1 mm socket 8 mm deep underneath and a curved 28 mm wide cradle on top that hugs the kit's crotch block between the hip joints, with 1 mm soft lips that grip the skirt armour rather than scratching it. A 5 mm hole through the side takes an optional M3 grub screw for heavier kits. Print it upright with 2 mm walls at 0.12 mm layers so the peg socket is round. Open the ready-made model free, resize it on your phone or computer, then download a print-ready STL, 3MF or G-code sliced for your printer, free.Opening the ready-made model and downloading it as STL or 3MF are free, no card; AI changes use credits, from Maker at $7.99 a month.No printer? We print this part and ship it to your door. See its priceUpdated
2
Adjust
Change its numbers in the viewer for free, or ask the AI in the chat: wall thickness, hole size, the thing it clips onto. AI changes use 2 credits per request (1 for a quick edit, 3 for a redesign), paid with a plan from Maker at $7.99 a month.3Print
Download a watertight STL or 3MF free, with your numbers and hand edits, or G-code sliced for your printer at the same price. After an AI change the download is included in every plan (4 credits without one).
Dimensions of the ready-made model (editable)
| Parameter | Value |
|---|---|
| curved width, wraps over the top along X | 28 mm |
| radius of curvature | 10 mm |
| retaining lip height | 1 mm |
| how far lips poke inward | 1.2 mm |
Example prompt
Model a Gunpla action base adapter 30 x 20 x 18 mm with a 3.1 mm socket 8 mm deep underneath for a Bandai Action Base 5 peg, a curved 28 mm wide cradle on top with 1 mm retaining lips for an HG crotch block, a 2.5 mm side hole for an M3 grub screw and 2 mm walls.
Fit notes
Every kit's waist is a slightly different width, which is why one adapter never fits all. Describe the crotch block of your Gundam in SpeakCAD, preview the adapter in the browser without charge, ask for a wider cradle for a Zaku or a 5 mm peg for MG kits in the chat, and download the STL.
Questions people ask about a Gunpla HG action base adapter with 3 mm peg
A small saddle that lets High Grade Gunpla kits without a dedicated stand hole sit on a Bandai Action Base 4 or 5 arm. The arm ends in a 3 mm peg, so the adapter has a 3.1 mm socket 8 mm deep underneath and a curved 28 mm wide cradle on top that hugs the kit's crotch block between the hip joints, with 1 mm soft lips that grip the skirt armour rather than scratching it. A 5 mm hole through the side takes an optional M3 grub screw for heavier kits. Print it upright with 2 mm walls at 0.12 mm layers so the peg socket is round.
Click Open it free on this page and create a free account (no card): the ready-made model opens in your browser, on your phone or computer, nothing to install. Change its numbers in the viewer for free and download a watertight STL or 3MF free, or G-code sliced for your printer at the same price. An AI change in the chat uses 2 credits per request (3 for a redesign), and the download after it is included in every plan (4 credits without one). Start with Maker: 50 credits a month for $7.99, cancel anytime.
On this page: open the ready-made model free in a SpeakCAD account (no card), change any dimension in the viewer, then download the STL or 3MF free, or G-code sliced for your printer at the same price.
A shared STL is modelled for someone else's measurements. Here you open the ready-made model free, change it to your measurements in the viewer, then download a file sized for the part you actually own, free as STL or 3MF.
Yes. SpeakCAD slices the part on its servers with OrcaSlicer and your printer's official profile (380+ printers, including Bambu Lab, Prusa, Creality and Elegoo), and you download the G-code (a sliced .gcode.3mf for Bambu Lab printers). G-code sliced for your printer costs the same as the STL: included in every plan, free for a part you shaped by hand, 4 credits without a plan for a part with AI work in it. Pick your printer on the printers page to see its profile.
No. SpeakCAD runs in the browser on your phone or computer: the chat, the 3D engine and the live viewer load in the tab. The only file you download is the finished STL, 3MF or sliced G-code.
Print it your way
More hobby & gaming
Apple Vision Pro travel battery pocketReady-made, opens free. A pocket that straps the Vision Pro battery pack (about 70 × 40 × 20 mm) to the official travel case so the cable does not yank the headset in a bag.RC car body post extensionReady-made, opens free. Body post extensions raise an RC car shell to clear larger tyres or a taller chassis, and the stock posts are rarely long enough.Steam Deck OLED clip-on kickstand for tabletop playReady-made, opens free. A removable kickstand that clips over the bottom edge of a Steam Deck LCD or OLED (298 x 117 x 49 mm) and props it at 60 degrees for docked-style play with a…MTG Commander deck box for 100 sleeved cardsReady-made, opens free. A hinged deck box sized for a full 100-card Magic: The Gathering Commander deck in double sleeves.Yoto Player Mini wall dockReady-made, opens free. A wall dock that holds a Yoto Mini and four cards in 2 mm slots, 80 × 40 × 60 mm.Nintendo Switch 2 game-card display rail 24Ready-made, opens free. A 280 mm rail that displays 24 Switch / Switch 2 game cards in 22 × 4 mm slots at 15 degrees.