- This tool shapes new and old Box stems to 1.28mm in the right dimension (kind of works with Cherry Clears and other oversized stems as well)
- Precision CNC’d from tool steel or Type III Anodized 7000 Series Aluminum
- Tool and accompanying jig should work with loose and mounted switches
- Anticipated $35-$25 MSRP (depending on MOQ of 100-250) the tool offers cost-recovery for 40 pretool switches or costs savings if you have a 60% or larger board and get switches at below their launch price What the tool does This tool and optional jig (Price TBA) that cuts Box/MX-type stems into appropriate dimensions whether soldered in a board or loose switches.
- Interest Check is for buyers and for vendors (buy more than 10 units and you can get vendor pricing).
- Link to google form here!
Why you need a tool
The difference between the bad box stems and Cherry MX cruciform is is ±0.025mm more on either side, or about one-third the thickness of a human hair from each side. Hand trimming stems is laborious, time intensive, and riskily imprecise – I know from experience. Both new and old stock Box switches have tolerance issues and even some of my Gateron stems and Cherry MX clear stems benefit from clean up. As someone in the Discord said: “You have been struck by the curse of the box switch, take 4 damage for every $100 value in keycaps in your inventory.” Read a little more about stemgate/boxgate here
This tool is the right tool
I have been working on this since about when stemgate/boxgate broke. Other approaches introduce as many problems as they solve with consistency in stems and raise durability concerns with the tools. Some home-brew trimmers get stuck or bind on either the cut or remaining walls. This tool’s internal geometry relieves friction on most faces and the jig also helps you grip the tool to pull it out. This tool cuts to 1.28mm on the critical dimension based on the averages of ≈2k measured cruciform sizes from common commercial switches (I also used the community spreadsheet of sizes and this thread for validation). The tool is somewhat self-centering, and the optional jig will take all the guessing out of trimming the stems whether you have them soldered on a board or loose. This tool will be good for hundreds to thousand(s) of cycles of plastic stems without sharpening. Based on my background in knife design/making, brass and non-treated stainless steel are poor choices for a cutting tool, even of softer plastics; this tool will be CNC’d from either tool steel or 7000 Series Aluminum with hard coat anodization (equal to mild steel raw) based on results of tolerance and durability testing – either material is ideal, we’re just working out which is the better one. The tool should leave stems looking pretty squared-off, but there should also be some distinct forensic marks so if you buy or sell switches, you’ll know they were fixed properly. The round-over on the cutting edge helps smoothly transition the cut edge to the existing stem and matches keycap grip on the stem without leaving a shelf or square corner that still stresses a keycap shape.When this tool trims a stem, it will cut all the over-dimensioned surfaces without making keycaps more likely to fall off - the nubs on a BOX stem reduce parallel surface area in a keycap stem for friction to grip, buy correcting the stem to parallel walls keycaps should hold more secure (more surface area for grip without the nub stretching).
Buying the tool is economic
The price point is pretty healthy if you want to safely use Box switches, even if you just want to fix the Box switches you already have. Take the price per switch, and add the price of the tool divided by number of switches to find out if you are saving money or rescuing sunk cost – e.g. I love my Box Royals and want to use them with my favorite keycaps, I got 100 of them at a price of about $0.30 each, bringing the per-switch price to if at the 250 unit cost of $25. Even adding in the cost of the tool, I am saving money over getting new stock. If I tried to buy an alternative and make 100 Cherry RGB Jailhouse Blues ($0.50/ea+ $20 JSpacers + lube), then I would spend more per switch.
Back it and I’ll release Free and Open Source parts
While I will not be open sourcing the cutting tool itself because it won’t do users any good, I will also be entirely open sourcing a 3D printable design for a switch grinder (jig for jeweler, needle, or ceramic file for grinding stem into shape or cleaning up the stem) and one that uses X-Acto blades if the project hits MOQ. Even if you don’t want to purchase a tool to fix the stems, I want to help provide options. If we hit the 100 MOQ, I’ll open source one of the versions, the other at 150 units, and the jig at 250. I have a number of future projects (cases, keyboards, tools, etc.) and I’m trying to support the keyboard open source community. A couple projects in, I’ll release the laser scans of various keycap profiles. If you want support open source and community projects, support this!
Timeline for release
The CNC shop is available to make the production run in early February.
CNC shop let me know that they’re going to machine the prototype run next week and I’ll get some video of it in action for the GB.