01 Self-Service Rental Stand CASE STUDY
IXTArent
IXTAbox sells premium, weatherproof boxes that mount to the back of a car. IXTArent is the self-service rental concept built around them - an unmanned stand that lets one person collect and mount a ~30 kg box without help, unlocked by a code sent to their phone.
My role - Hardware & stand design lead · KTH MF2088 · A team project; this page focuses on my contribution

01Brief
Rent a 30 kg box, unmanned.
IXTAbox wanted to add a rental offer without diluting its premium positioning or stationing staff at every site. The stand had to hold 4-8 boxes, run fully self-service, stay secure, and install as modular ground- or wall-mounted units.
The hard constraint was the box itself - large, ~30 kg, awkward to lift, valuable enough to lock down, and dirty from sitting near the rear tyres. Talking through the requirements reframed two of them: unmanned became fully self-service daily use with light maintenance once or twice a month, and since the box is already weatherproof, an open stand could showcase it and cut cost.
02Research
Break the stand into sub-functions.
Following the Double Diamond, I split the stand into independent functions - lifting, locking, storage layout - and drew on self-service and everyday mechanisms: Kayakomat kayak stations, ski-rental lockers, overhead garage storage, ELFA shelving, and Igloohome smart locks. A Crazy 8 round generated directions; the strongest three moved on to 3D models.
03Concepts
Three concepts, one matrix.
Concept 1 - Open shelf, side access: ELFA-style adjustable sheet-metal arms with a rotating hook lock (needs a slot machined into every box) and an external hydraulic trolley to move the box. Concept 2 - Wardrobe / Murphy-bed: fully enclosed; the shelf-door itself lowers to car height on gas springs and the box mounts directly - no trolley, weather-protected. Concept 3 - Open shelf, front access: like Concept 1 but a hinged front door instead of the hook; still trolley-dependent.
A weighted decision matrix put Concept 2 first, Concept 3 a close second, and Concept 1 last. Two were strong enough to justify building - so both Concept 3 and Concept 2 went to full prototypes.
04Prototype 01
Open shelf, in stainless.
Concept 3, built in 3 mm stainless steel - laser-cut and bent. ELFA-style tab-and-slot arms lock onto the frame with riveted plates to resist tampering, and joints are kept minimal. It stacks two boxes vertically, with two stands sitting back-to-back; a welded stainless-tube front door is secured by an Igloohome smart lock and a slot that wraps the box handle.
Building it exposed tolerances that were too tight - friction hurt the experience - so it became the validated back-up, while its lessons (looser tolerances, a flipped base for better fitment) fed the next build.

05Prototype 02 - Production
The wardrobe, with gas-spring lift.
Concept 2 - the design selected to go to production. A tubular spaceframe is bolted to sheet-metal panels rather than welded, keeping cost down with laser-cut tubes held to tight tolerances. A pair of pull-type gas springs between the base and the wardrobe door carry the weight; the door holds the box on a buckle strap and swings on bearings.
Multiple gas-spring mounting holes let us tune spring force without redesigning the frame. A support leg doubles as the pull-down handle, adjustable feet level the stand on the forecourt's slope, and concrete ballast in the base keeps it planted.

Fabricated and assembled by hand in the workshop - spaceframe, panels, and lifting hardware.




06Deployed & Access
In the field, unlocked by phone.
The production wardrobe unit installed on a fuel-station forecourt in Stockholm. Access is keyless: Igloohome smart locks issue a time-limited PIN to the renter's phone the moment they book - no Wi-Fi at the stand, no staff on site. (The booking portal - a Google Maps stand finder, payment, and lock integration - ran as a parallel software workstream; my focus was the stand.)








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