A mixing device for cylindrical jars, the device having two drive rollers and two guide rollers extending upward from a housing and through a top surface of the housing. The rear end of the top surface has a stop member. The drive rollers on one side of the jar and the guide rollers on an opposite side of the jar are mounted on axles positioned in the interior of the housing, wherein the axles slant downward 2 to 45 degrees from the front end to the rear end of the housing. A motor and transmission in the housing are connected operatively to the drive rollers. The drive rollers will rotate the jar at least 5 RPM with the jar tilted downward. Ajar of natural peanut butter rotated for 5 to 20 minutes will remain uniformly mixed for a week.

A cannabis preparation mixer includes a processor, electrically coupled with each of a weighing system, a heating system, a mixing system, and a user interface within a main housing. The processor receives input from the weighing system and the user interface and transmits instructions to the heating system and the mixing system to heat and mix a mixture according to a predetermined pattern selected based upon a weight of herbs sensed at the weighing system. A heating system includes a heat plate that sits on top of a heating element which sits on top of the insulation pad. A mixing system includes a magnetic motor with a magnetic stirrer and wireless temperature probe that rotates above the magnetic motor, the magnetic stirrer having a wireless temperature probe therein. The user interface receives input from a user to identify user preferences and settings.

A mixing device for cylindrical jars, the device having two drive rollers and two guide rollers extending upward from a housing and through a top surface of the housing. The rear end of the top surface has a stop member. The drive rollers on one side of the jar and the guide rollers on an opposite side of the jar are mounted on axles positioned in the interior of the housing, wherein the axles slant downward 2 to 45 degrees from the front end to the rear end of the housing. The drive rollers will spin the jar at least 5 RPM with the jar tilted downward. A motor and transmission in the housing are connected operatively to the drive rollers. Ajar of natural peanut butter with separated peanut oil and solids may be placed on the rollers, with the lid of the jar engaging the stop member and rotated for 5 to 20 minutes. The natural peanut butter will then remain uniformly mixed for a week.

A jar or other storage container with an integrated stirring device, where the contents of the jar or storage container can be stirred and mixed together without having to completely open the jar or storage container. The core components in one embodiment are a top portion that contains external threads, a lid portion which contains internal threads, a spindle with an etched self-reversing screw pattern, a hub, one or more stirring blades, and a nut. The stirring blades have one end attached at a hub that is free to rotate on the spindle, the other end is attached to a nut that can travel up and down the self-reversing screw pattern, and the spindle is fixed to the lid portion. The surface area of the stirring blade(s) can be changed to accommodate different thicknesses and viscosities of different fluids and semi-fluids placed in the storage container.