Ballerina is a turntable that rotates the printing bed ad infinite left and right as needed by the printer allowing the machine to print at any angle in any given position always against gravity, hence witout supports, powered by a closed loop stepper motor.  The main purpose is to make Bollero work as intended, but trust me, it has  an ace up the sleeve for Rumba too. Powered by 1 closed loop stepper motor.

You buy here the 3D ready printed on demand objects:  the bearing balls the platform and the bearing balls counter holder (external sleeve) and internal balls holder lower part.

 All 3D printed parts will be delivered as printed and pried off the printing bed, no supports removal included, no parts cleaning, no holes drilling, nothing except the printing itself.  You need to prepare the parts maually and fit them together with apropriate nuts and bolts, test fit them to be snug, no play and still freely rotating.

the procedure is to put the platter upside down on a table, insert the outer ring upside down, place the balls in the housing, insert the lower inner bearing and lock them together with nuts and bolts tight.

If this is preventing rotation, than open the system partially, put in a fistfull of fine sand, close gradually and rotate left and right for 30 seconds at the time the assembly for half an hour, than re open everything and carefully wash all sand out from each ball and housing.

Re insert everything clean back and test again, untill all fits shug, zero play and rotates smooth.

When all is done, open once more the housing, generously apply a thick grease that is not dissolving your polymer of choice, close back again, and you are ready to rock.

This rotating platform can be fitted either on Rumba or on Bollero motion axis systems, is powered via timing 2T belt wide 6 mm closed loop of 400 to 610 mm depending on jow you provide teh motor fitting position.

Indipendently you can use the same Ballerina platform with an Arduino board as rotating support for objects to be showcasted, photographed or filmed, as camera automated support for show casting and filming and even to place a platter of food on it and make your guests go bizark each time they try to take any food by starting to spin the platter by surprise.