Knee rests and an amplifier for the O'Cello

thingiverse

Remixed from The O’Cello by cokane http://www.thingiverse.com/thing:1703629 and AddOns by Zarlor http://www.thingiverse.com/thing:1833270. I extensively reworked the knee rest pads created by ZARLOR, opting for 12mm carbon fiber tubing instead of aluminum profiles. I also added panels for an amplifier with tone control for headphones and line-out capabilities. The necessary electronics were sourced from https://www.aliexpress.com/item/Electric-Violin-Pickup-Adjustable-Pickup-Piezo-Pickups-EQ-Parts-Accessories-20-12/32849083156.html?spm=a2g0s.9042311.0.0.4WJWD8. To achieve the desired sound quality, I replaced the aluminum profiles with carbon fiber tubes similar to those found at https://www.aliexpress.com/item/2pcs-3K-Pure-Carbon-Fiber-12MM-OD-X-10MM-ID-Tube-500MM-Long-Roll-Wrapped-Tube/32750177570.html?ws_ab_test=searchweb0_0,searchweb201602_4_10152_10065_10151_10344_10068_5722815_10342_10547_10343_10340_10341_10548_5722915_10698_10697_5722615_10696_10084_10083_10618_10304_10307_10302_5722715_5711215_10059_5723015_10534_308_100031_10103_441_10624_10623_10622_5711315_5722515_10621_10620,searchweb201603_15,ppcSwitch_5&algo_expid=ea191c62-6732-408c-a59a-5e0a175b2fac-8&algo_pvid=ea191c62-6732-408c-a59a-5e0a175b2fac&priceBeautifyAB=0. For detailed instructions on assembling the parts and combining them with The O'Cello, refer to the accompanying PDF. Note that both knee rests are not symmetric, requiring a right and left version for proper installation. The total weight of the instrument is now 1720g. Including materials, tuners, strings, carbon bow, electronics, and battery, the total cost was approximately $150 in 2017.