E14S Fast Electric Unicycle - new version!

thingiverse

UPDATE 14.11.2016: See article with detailed instructions in MAKE magazine:http://makezine.com/projects/3d-print-electric-unicycle/ This is an updated version of the E14D Electric Unicycle which I published earlier. My goal was to make a more compact version with better ergonomics but with the same impressive range and performance as its predecessor. This unicycle is also designed for the high-performance 14" 500W Unicycle motor from Microworks, but it can be used with others as well. The old version was designed to be used with up to four individual 16-cell battery packs, which were connected in parallel. Instead of four packs of 16 cells (16S1P), this new version uses two packs of 32 cells (16S2P), which makes it possible to make the battery housings significantly smaller but still with the same total capacity. Also, this version uses a horizontal controller which is located just underneath the handle, so the housings on both sides are now available for batteries. The essential structure is the same as on the earlier version, the housings on both sides are identical and printed in two sections, which are then stacked and secured with M8 threaded rods which go through the whole structure from top to bottom. The housings on both sides are bolted to each other through the top handle part, also using two M8 threaded rods. A horizontally programmed mainboard can be placed in the space underneath the handle. You can also use a regular vertical controller, but you will then need to use one of the battery housings to accommodate the controller so you will only be able to use half of the potential battery capacity. The pedals and assembly parts are designed to fit perfectly with the unicycle shell. Power switch, charging socket, LED-battery indicators, HAL-cables, and piezo buzzers are also included in the design. Batteries: Two 60-volt 16S2P unicycle batteries with 32 cells for maximum range and capacity (you can use regular 16-cell batteries which are easier to find, but they will have only half the capacity). Check the dimensions of the batteries (maximum thickness 43mm, max width 142mm. max height 160mm) and make sure they will fit before you buy them. One 67-volt generic unicycle battery charger is also required. Other parts: 1-2 piezo buzzers can be used to add sound effects to the unicycle. UPDATE 13.10.2016: Following updates have been made to the files: Screw locations on the pedal brackets have been adjusted to match the latest version of the pedal holder from Microworks. Upper covers have been changed to fit the latest version of the LED battery indicators from MIcroworks (LEDs directly on PCB). Battery housings have been slightly widened on the inside to easier fit 32-cell packs on both sides (43.5mm width). The space for the controller board underneath the handle has been made slightly higher. Both halves of the battery housings have been made slightly higher, adding just enough clearance to also use a wider 14x2.5" tire instead of the regular 14x2.125". The outer diameter of the 14x2.5" tire will in fact make this a 15" unicycle. This unicycle shell can now also be used with 16" motors if you use the following spacer, which can be added between upper and lower section of the battery housing to increase overall height:http://www.thingiverse.com/thing:1834059 9.11.2016: Now you can also add some fenders with or without integrated headlight:http://www.thingiverse.com/thing:1879793 PLEASE SHARE YOUR MAKE IF YOU DECIDE TO PRINT THIS ITEM! CREATING AND FINALIZING THIS ELECTRIC UNICYCLE HAS TAKEN SEVERAL WEEKS OF DESIGNING, TESTING, MODIFICATIONS AND MORE THAN A DOZEN TEST VERSIONS TO GET ALL THE PARTS RIGHT AND TO MAKE THEM FIT PERFECTLY. PLEASE CONSIDER LEAVING A TIP VIA THINGIVERSE IF YOU FIND THIS ITEM USEFUL.