Cubii Jr platform

thingiverse

I work from home a lot and thought Cubii Jr was a great way to get more exercise. It looked like it would work out, but I encountered too many issues with the chair pushing away. The wheel locks on the chair and the wheel stops that came with the Cubii did okay, but made getting in and out of position annoying. Ultimately, I stopped using it. Then I had an idea to put it on a wheeled platform that could attach to the chair so it would easily move with the chair when I needed to stand or sit and wouldn't move while using it. This requires having an office chair that raises high enough to accommodate the machine being raised off the floor and also having a desk that is high enough for the higher seating position. Preliminary tests show that it works as desired, but we'll have to see how well I live with it. Note that this design isn't entirely complete as there is nothing connecting it to the chair (using zip ties at the moment). I may not ever publish the final solution to that problem though as it will be specific to my chair's design. The idea, however, is to connect from the front wheel plates to the chair legs in a manner that is easy to latch and unlatch without looking with a foot. ### Non-printed parts: - 1/2" plywood for the platform - 5 castors with standard mounting pins (I used the original wheels for my chair that I had replaced with roller blade style wheels) - 22 35mm m5 flat head screws (https://www.mcmaster.com/91420a340) - 4 30mm m5 flat head screws (https://www.mcmaster.com/91420a332) - 26 m5 base weld nuts (https://www.mcmaster.com/90594a320) - I also tried some rubber trim, but got the wrong size. I've ordered this to try: https://www.mcmaster.com/8693k26 ### Printing: 1. I used standard PLA. 2. I used a 0.2mm layer height with a 0.4mm nozzle. 3. I set all perimeters to have 9 layers and used a 50% infill with the Gyroid pattern for strength. 4. I printed all parts with the surface that goes against the wood as the bottom layer. Except for the "front wheel plates" no supports are needed. 5. The "front wheel plates" will need support, how much depends on the orientation. I opted for the same orientation to have a consistent look which meant a LOT of support material 6. You need the following number of copies: - Pin = 2 - Under Plate = 3 - Wheel Plate = 3 - Front Hook = 1 - Front Wheel Plate = 2 - Rear Hook = 2 - Wheel Mount = 5 ### Assembly: 1. I refer to the end closest to you when using the machine as the front and the end with the bar for a leg as the rear. 2. I laid everything out on the wood, marked holes, and determined the size of the platform. 3. Rear hooks slide under the rear leg bar and up against the rubber feet. You will use the 4 30mm screws here and mate up with 2 of the Under Plates. 5. A Wheel Plate goes on either side of the rear leg bar right up against the leg. These mate up to Wheel Mounts using 8 35mm screws. 6. The 3rd Wheel Plate goes in the center of the platform and mates to a Wheel Mount with 4 35mm screws. 7. The Front Wheel Plates go up against the sides of the front of the machine and mate up to the final 2 Wheel Mounts. 8. This is a good time to install the wheels in the Wheel Mounts. They should just press in. 9. The Front Hook mounts in the center of the front with the overhang over the front of the Cubii's base. It mates up with the final Under Plate using 2 35mm screws. 10. Install rubber edging if desired.