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PCB THT Holder

Turns a photo of your circuit board into a printable jig that holds through-hole parts while you solder

PCB THT Holder is a free browser tool for hand-soldering through-hole parts on small batches of boards. Free and open source (MIT license); no account and no paid plan. Exports STL. Last checked 26 September 2026.

Open PCB THT Holder See alternatives

Opens segmentcontroller.github.io

At a glance

Price: Free and open source (MIT license); no account and no paid plan
Runs on: Browser
Exports: STL
Multicolor: No, single color
Account: Not needed
Open source: Yes
Skill level: Easy: a few settings to tune
Best for: Hand-soldering through-hole parts on small batches of boards
Selling prints: Allowed The app is MIT licensed with no separate terms, and the jig is built from your own board layout
How we checked: Opened the generator Opens without an account; a board image leads to panel, thickness and tolerance settings, 13 preset parts and a 3D view with a Download STL button
Last checked: 26 September 2026

Open generator

Sources: GitHub repository and README, MIT license, Changelog (checked 26 September 2026)

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What is PCB THT Holder?

PCB THT Holder is a free, open source browser tool that turns a photo of your circuit board into a printable jig for soldering through-hole parts. You add a top-view photo, which the app flips and fades so you can trace over it, then mark each tall part with a circle or a rectangle and enter its size and its height above the board. The tool cuts a matching pocket for every part into a flat panel, so the board can lie face down on the print with its parts held straight while you solder the leads.

A set of 13 preset parts, loaded with one click, covers DIP sockets, electrolytic capacitors, buzzers, terminal blocks and relays, and you can save your own parts and import or export the library as a JSON file. Project settings cover the panel size, board thickness, the height of any surface-mount parts, a print tolerance of up to 2 mm and a text label on the side. Support legs can go at the corners automatically, a hollow mode prints only the top layer to save time, and a project file lets you reopen a layout later.

It runs in the browser without an account and does not upload the photo. It suits hobbyists and small makers who hand-solder the through-hole parts on a batch of boards.

What you can make

Soldering jigs for through-hole parts
PCB holders laid out from a board photo
Hollow quick-print holders
Labeled jigs for repeat board batches

How to use PCB THT Holder

Open the app and drop in a straight-on top-view photo of your PCB
Set the panel size, board thickness and print tolerance in the project settings
Place circles, rectangles or preset parts over each through-hole part and enter their heights
Open the 3D view, check the mesh and download the STL
Print the jig, fit the parts into the board, lay it face down on the jig and solder

What you'll need to print it

Filament and parts that suit what you make with PCB THT Holder.

PETG

M3 heat-set inserts

M3 screws

Bambu Lab Fastener Kit Bambu Lab
Hilitchi M3 socket head cap screw assortment kit (affiliate link) Amazon

Also handy

Digital calipers

Filament dryers and dry boxes

SUNLU FilaDryer S4 (affiliate link) Amazon
Polymaker PolyDryer (affiliate link) Amazon

Some of these are affiliate links: we may earn a small commission, at no extra cost to you. More about that

PCB THT Holder pros

Works from a photo of your own board, so the pockets line up with the real part positions
Preset parts, print tolerance and automatic corner legs save a lot of fiddling
Free, open source, no account, and the board photo stays on your device

PCB THT Holder cons

Only round and rectangular pockets, so odd-shaped parts need a close approximation
You measure part sizes and heights yourself; the photo is a guide, not an automatic part detector
Small one-developer project with very little community feedback