Setup and included attachments
When a juicer uses a separate homogenizing screen
Some juicers include an attachment that changes their work beyond extracting juice. The Tribest SoloStar 4's manual describes a separate homogenizing screen and spaghetti and fettuccini nozzles. That can be useful if pasta is already on your home-prep list, but it adds a second configuration rather than making the juicing screen do everything.
Read the parts list as a setup plan
First identify which screen and nozzle the job requires. For juice, the SoloStar 4 manual specifies the juicing screen and juicing nozzle, with the juice container under the juice outlet and pulp container under the nozzle. For pasta, rice cake, breadsticks, tofu and selected fresh-food processing, it describes the homogenizing screen plus the nozzle suited to the task. The current and exact refurbished SoloStar 4 pages both list the screens and spaghetti/fettuccini nozzles in the box. If buying elsewhere, still confirm the selected SKU's contents rather than treating a page photo as an accessory list.
Changing the configuration is a stopped, unplugged task. The manual illustrates removing the screen-locking cap, taking out one screen and seating the other before fitting the selected nozzle. That is a different workflow from swapping a pulp-filter setting while the juicing assembly stays intact. It also means several pieces must be stored and cleaned, so the extra function is most useful when it will be used often enough to justify that work.
Keep the operation within the instructions
The SoloStar 4 manual asks for produce cut into smaller lengthwise pieces and fed in small amounts through the funnel. Use the included plastic plunger if needed; do not push food with fingers or a kitchen utensil. If a hard or foreign object stops the motor, the directions say to stop first, then use Reverse briefly as instructed. Reverse is a clearing control, not a selectable operating speed.
Do not assume that the accessory set turns the machine into an unrestricted grinder. The same manual cautions against using its homogenizing nozzle for dried pepper or coffee beans, and accessory rules are task-specific. Follow the exact instructions for the item you intend to process. Tribest's product page advertises “40% more juice,” but the reviewed documents do not establish independent output or prove that a second screen changes juice yield.
Compare different kinds of added capability
Greenstar 5 also has a documented food-processing attachment set, but it is a horizontal twin-gear machine with separate gear alignment, screens and a safety hood. Its exact refurbished offer lists a breadstick/sorbet set; its manual states a 40-minute continuous session followed by a 10-minute rest. The Greenstar Gold refurb box includes a pasta-making set. That is a different package and mechanism, even though both families can make food other than juice. Check the exact contents list before treating a named optional attachment as included.
The SoloStar 4 is a horizontal single-auger machine. Its separate second screen and noodle nozzles offer a more specific pasta path, but it has a different manual and setup than the Greenstar twin gears. The vertical Shine Easy instead centers the workflow on a batch hopper and Quick Fill flip top, with a documented 20-minute session followed by a 10-minute rest; its reviewed refurb offer does not list the SoloStar's pasta nozzles. The Slowstar AI adds named presets and sensor-led adjustment, but those are control features, not food-processing attachments.
Do not overlook unknowns while comparing features
On SoloStar 4, Tribest's page lists 57 RPM while its manual says “as slow as 47 RPM.” The page's 17 × 6.5 × 12.4-inch, 12-pound specifications conflict with the manual's 19-inch-wide × 10-inch-high × 8-inch-deep size and 15.5-pound weight. Leave a hard speed, height, depth or lifting requirement unmatched until the exact source conflict is resolved. The manual does not give the supplied juice-container capacity, a routine continuous-use limit or dishwasher-safe parts. Its warning that more than 30 minutes of straight use may cause overheating is not a confirmed 30-minute rated session; the approximately 30-minute cooling advice applies after automatic shutdown.
The practical question is whether the extra screen/nozzles earn their place in your routine. If you mainly make fresh juice, a simpler single-configuration setup may need less storage and cleanup. If you actually want the documented noodle function, the SoloStar 4 may be a more relevant option—provided the conflicting fit details and exact sale terms work for you. Read the SoloStar 4 assessment, and compare the separate Greenstar Gold, Greenstar 5, Shine Easy and Slowstar AI assessments. These sources document setup and offer differences, not comparative performance tests.
The earlier SoloStar 3C has a separate suffix and manual bridge
Tribest's selector identifies a SoloStar 3C as SS-9113C. Its grouped support FAQ names SS-9113C alongside SS-4200, SS-4250 and SS-9113 and points to the SoloStar 3 manual; that manual's cover/specifications instead say SS-9113. Keep the C suffix visible: the grouping is maker support evidence for applying the manual, not a model-specific C revision sheet. The old manual describes the same broad pattern of a juicing screen/nozzle and a separate homogenizing screen with pasta nozzles, but a used unit's actual screens and accessories must be checked with its seller.
The U.S. current juicer collection lists the SoloStar 4 but not the 3C, while the separate 3C parts collection is paginated across 25 parts/accessory items. A parts page is not an active complete-machine offer. The SoloStar 3C review therefore treats the model as an earlier used/old-stock possibility, not a current new product. For any secondhand configuration, verify the exact label, all pieces in the intended setup and the seller's condition and terms. The older 3 manual warns that more than 30 minutes of straight use may overheat the motor; it does not promise a 30-minute routine session, and its approximately 30-minute cooling instruction follows automatic shutdown. Unlike an abstract “multi-function” claim, the food-processing attachments only matter if you want that screen-change workflow.