SKU: 71582799728
lego gear rack

lego gear rack GBC

Sale price$19.53 Regular price$21.70
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Ships within 48 hours · Estimated delivery Aug 26 - Aug 31

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Description

lego gear rack GBCGear Rack Elevator is a very smart Great Ball Contraption module from the GBC builder mickthebricker. This ball machine works like a three steps stepper, but where each stage is relying on a distinct mechanism. The first stepper from this cool ball machine is a non motorized one: it carries GBC balls from the entry bin to the main ramp of the module and is only actioned by the main ramp. The second and the third steppers are constituting the main



Gear Rack Elevator is a very smart Great Ball Contraption module from the GBC builder mickthebricker. 

This ball machine works like a three steps stepper, but where each stage is relying on a distinct mechanism. 

The first stepper from this cool ball machine is a non-motorized one: it carries GBC balls from the entry bin to the main ramp of the module and is only actioned by the main ramp. 

The second and the third steppers are constituting the main mechanism of the GBC module. A central block underneath the exit ramp is moving up and down these two steppers, keeping a perfect synchronization thanks to the Technic racks located on each side of the GBC build. 

This marble machine is capable to cope with a very large number of balls.

Reproduce it thanks to ready to build kits available on BuildaMOC.

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SKU: 71582799728

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4.1 ★★★★★
Based on 23 reviews
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S
Verified Purchase
Stephen love
Massapequa, US
★★★★★ 5
Comfort
Love! Excellent quality and sooooo comfy! Love
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 17, 2026
K
Verified Purchase
KaDi
Charlottesville, US
★★★★★ 4
Cute and comfortable!
Size: 6.5, Color: Chestnut
These are cute and surprisingly comfortable! My arches feel supported and the soles don’t feel as block-like as other platform style sandals! Things to note: The footbed liner is not made of suede and is a little slippery. It’s like a neoprene liner which was unexpected for an Ugg shoe. Also, I only intend to wear these sandals as slides (a la Birkenstocks) so the “adjustable” Velcro strap over the top part of the foot seems useless. It doesn’t snug the top down at all, functionally speaking it is only to wear around the back of the ankle. Maybe this matters to someone thinking they could tighten the top down a bit. The ankle strap is comfortable but could be a bit longer. Overall they are a cute option to the platform Birks that are very uncomfortable imo. Love the options to order half sizes. I’m usually a 6 in Ugg boots but ordered my regular shoe size 6.5 and they fit well. My heel would be at the very end of my sandal if I sized down. True to size. Keeping and will order in another color!
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Reviewed in the United States on May 28, 2025
J
Verified Purchase
Jess
Bozeman, US
★★★★★ 5
Comfy
The most comfortable Sandals I own!
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Reviewed in the United States on April 7, 2026
A
Verified Purchase
Avid Reader
Los Angeles, US
★★★★★ 5
More comfortable than flats!
Size: 8.5, Color: Bay Fog
I love these sandals! They run true to size, and they’re sooo comfortable. I was worried about getting fakes, but these were the real deal. The color is lovely (light purple). The foot bed can get dirty, but I find them to wash up nicely (by hand, not machine). I have purchased two more colors since! So much better than flats!
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Reviewed in the United States on November 9, 2025
S
Verified Purchase
Siyu
Bozeman, US
★★★★★ 5
Comfy dual-mode sandals
Cute, quite comfy to walk in and love the support of the heel strap! It is not as comfy if using in slipper mode because the straps don’t keep your foot tight enough. I am usually a 8.5 but it runs slightly small so I switched up to a 9.
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Reviewed in the United States on June 25, 2025

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