I Broke My Smart Motor Hacking Tracks for Vertical Blinds 66 x 84

I woke up at 6:15 AM with a laser beam of sunlight hitting my face because my office blinds didn't close all the way. I have an awkward 66-inch sliding door, and instead of doing the right thing, I tried to be clever. I thought I could save a few bucks by hacking a standard 72-inch track into vertical blinds 66 x 84. Spoiler: I ended up with a pile of aluminum shavings and a dead motor.

Quick Takeaways

• Never cut motorized tracks; the internal timing belts are precision-tensioned at the factory.
• A 66-inch opening is narrower than standard 72-inch sliders, making the 'vane stack' a bigger issue for light blockage.
• Custom-ordered tracks ensure the Zigbee motor limit switches work without grinding gears.
• Outside mounting can 'fake' a larger door and keep your glass clear of the stacked vanes.

The 6-Inch Difference That Destroyed My First Motor

Most patio doors are six feet wide. My office door, for some reason known only to the 1980s architect who designed this condo, is exactly 66 inches. Last year, I swapped my drafty 72 x 84 vertical blinds in the living room and it was a breeze because that is a stock size. When I tried to apply that same logic to the office, I hit a wall.

I naively thought I could just buy a standard big-box size and hack off a few inches. I figured the motor wouldn't care if the track was slightly shorter. I was wrong. That 6-inch difference is the gap between a system that glides and one that burns out its circuit board before the first week is over.

Why You Can't Just 'Saw Off' a Smart Track

I took a hacksaw to a 72-inch smart track, thinking it was just metal. These tracks use a continuous loop tension belt. When you shorten the track, you have to cut and re-splice that belt. Re-splicing a high-torque belt so it doesn't slip under the weight of 20+ PVC vanes is nearly impossible for a DIYer.

I realized why choose smart blinds in the first place—it is about precision and reducing friction. My hack caused the internal Zigbee motor to pull too much current as it struggled with the uneven belt tension. The motor noise jumped from a whisper to a grinding 55dB before it finally gave up the ghost. If you want quiet automation, the track length must be factory-set.

Getting the Stack Right on a Narrower Door

On a 66-inch door, your glass real estate is precious. A standard 'stack' of vanes takes up about 7 to 9 inches when open. If you have a center-split, you are losing significant light. On a narrow frame, I often suggest motorized light filtering sheer shades because they roll up and out of the way entirely.

If you stick with verticals, choose a one-way stack toward the fixed pane of glass. This keeps the 'bunch' of vanes from blocking the part of the door you actually walk through. When you order exactly to 66 inches, the carrier spacing is mathematically balanced so the vanes don't overlap awkwardly or leave gaps at the edges.

Should You Outside Mount to Fake a 72-Inch Door?

If you have the wall space, this is the pro move. Buy a 72-inch track and mount it on the wall above the frame. This allows the vanes to stack completely clear of the 66-inch opening. You 'fake' a larger door and get 100% of your sunlight back.

The downside? You lose that clean, recessed look of an inside mount. But for a 66x84 opening, the extra light is usually worth the trade-off. Just make sure you use heavy-duty anchors. A motorized rail with 84-inch vanes carries some serious weight, and you don't want it pulling out of the drywall during a calibration run.

My Current Setup: Quiet, Smooth, and Finally Sized Right

I finally swallowed my pride and ordered a custom 66x84 setup. The motor is whisper-quiet—under 35dB, which is quieter than my refrigerator. It pairs perfectly with Home Assistant. I have a routine where 'Alexa, goodbye' closes the blinds to 100% and locks the back door.

The comfort and convenience of motorized vertical blinds only happens when the hardware is right. No more grinding, no more stuck carriers, and no more aluminum shavings on my carpet. If you have a non-standard door, do yourself a favor: put the hacksaw away and order the right size.

FAQ

Can I use my old vanes on a new smart track?

Usually, yes. Most vertical tracks use a standard peg-and-hole clip. Just ensure your existing vanes are 3.5 inches wide, as that is the standard spacing for most motorized carriers.

What happens if the power goes out?

Most modern smart motors have a manual override or a battery backup. If it's a battery-powered unit, it will keep working for months. If it's plug-in, you'll have to wait for the power to come back to move them via the app, though some allow you to gently pull them by hand.

Is Zigbee better than WiFi for blinds?

In my experience, yes. Zigbee doesn't clog up your router and the battery life on Zigbee motors is significantly better because they use less energy to stay connected to the network.