Tej’s Lab · Calgary

An engineer’s approach to making things.

I take things apart to see what is inside, and I have never really stopped. Some of it ends up on Instagram. The parts worth making twice end up here as kits.


Tej Grewal
Tej Grewal · Calgary

About

Prototyping in public.

Taking things apart

As a kid, no toy or discarded item in my house stayed whole for long. If something came my way, I’d take it apart piece by piece, not to break it, but to see what was inside and keep whatever still had value: motors, electronics, anything that worked or could be made to. I had a whole drawer of salvaged parts, which eventually became the raw material for building custom Beyblades.

That habit never really left. It just found new outlets. Every year there’s something new to learn: gardening, woodworking, photography, whatever pulls my attention next. Manual, hands-on work, the kind most people try to avoid, is where I do my best thinking. It clears space in my head for whatever I want to build next.

Two panels of geometric wood wall art hanging on a wall
Wood wall art, finished
Framed panels of the geometric wood art stacked on a table part way through the build
The same art, mid-build
A mid-century dresser shown before and after refinishing
Dresser, before and after

One project at a time, whatever the material

Tall pink gladiolus spikes flowering in the garden
Gladiolus
An orange dahlia in full bloom, photographed close up
Dahlia
Homegrown tomatoes, peppers and beans laid out after picking
What it grew
A raised garden bed he built from scratch, lined and filled
The bed it grew in

The garden is my other lab

From a detour to a company

I moved to Canada in 2017 for a Master’s in Electrical and Computer Engineering. I ended up in petroleum engineering instead, not the plan, but the industry gave me something I didn’t expect: a front-row seat to a real, expensive problem. Methane monitoring was, and still is, costly, and the tools available weren’t built for the scale the industry actually needed.

That problem stuck with me. I built the first prototype while I was still in school, nights and weekends, the same instinct from the toy drawer, just aimed at something bigger. In 2018, I founded Qube Technologies Inc. to take it further: lower-cost methane monitoring hardware, built to work in the field, not just on a bench.

An early copper coil sensor prototype on a clear substrate
Coil sensor, early build
A green sensor circuit board with its copper coil, wired up on the bench
The board it ran on
A solar-powered methane monitoring unit installed outdoors
Installed on-site
The monitoring hardware caked in snow after a storm
Field-tested, in the snow

From bench prototype to field-deployed hardware

That work has since been recognized in Forbes and with SAIT’s Outstanding Young Alumni Award in 2023.

Forbes

30 Under 30, Energy

2023

SAIT

Outstanding Young Alumni

2023

Company

Qube Technologies Inc.

Founded 2018

A reserved place card for Tej Grewal at the SAIT 2023 Alumni Awards
SAIT 2023 Alumni Awards

Sharing the process, not just the result

I’m social, but I’ve never been a camera-facing person. The idea of putting myself in a video used to be an easy reason to not do it. What changed my mind was realizing how much of what I’ve learned, how to take a rough prototype and actually finish it, how to make something work outside the lab, in the field, in the snow, isn’t written down anywhere. It’s just sitting in my head, or in old project photos.

So I started posting short, bite-sized clips on Instagram anyway, camera-shyness aside. They’re built around a hybrid workflow: unusual project settings, new ways of solving old problems, builds that start with a handful of off-the-shelf parts, or nothing at all, and end with something that actually works.

I want the next generation to get curious, get their hands dirty, and see real value in building things, including the messy, unglamorous parts most people skip. That’s the whole reason the drawer of parts never really closed. It just got bigger.

Where the clips live

Layeraser’s own

One that travelled


Kits

Tested and approved by Tej.

One at a time, properly. Every kit here is one I have tested and validated myself before it goes on sale.

Kit No. 001 · Layeraser

One file, two finishes.

Three ultra-fine glass files at #12000. They take the layer lines off, and on most parts that is the whole job. The same print, before and after. Nothing else changed.

A 3D printed gem straight off the printer, layer lines still visible
Off the printer
The same gem after the kit, polished to a mirror
After the files

Three glass files

$49CAD

Free shipping to 38 countries · about a week · 30-day returns

373 sold and 4.9/5 from 175 reviews of these files.

Grit

#12000

In the box

3 files

Workshop

Calgary, AB

Status

On sale

See the files · from $49 CAD Wheels, compound and a rotary tool are optional add-ons at checkout.

Kit No. 002 · Winterwatt

An AA that charges
at thirty below.

Alkalines quit in the cold and lithium ion will not take a charge below freezing. This one is built on lithium titanate, holds over 5,000 cycles, and Tej ran it frozen into a block of ice.

See Winterwatt

More from the lab

The next one, when it is ready.

Tej builds and tests far more than reaches a shop. Leave an address and you will hear when the next kit is ready. Nothing else, ever.