The model file is downloaded on MyMiniFactory with your account — that's how their catalog works. Download it and attach it to your order: the studio will print it and quote a price.
The creator allows printing this model for personal use only: prints can't be sold. The studio will print it for you personally.
Creator's license: MyMiniFactory Digital File Store License
Creator's description
NOTE: All known bugs have been fixed in this release. If you downloaded a previous version, please download this new copy and refer to the updated assembly guide. SP17: Rolling Ball Clock is my largest and most exciting clock. It is powered entirely using 3/4" (19mm) steel balls. Runtime is 1.6 to 2.4 days with an accuracy of 1-2 minutes per week. A manual winding mechanism lifts the balls back to the top. The overall size is 9.15x10.75x33.5" (23x27x85cm). It prints in around 120 hours on a SnapMaker U1 using 5kg of PLA. The minimum required print bed size is 250x210mm (Prusa MK4) or 220x220mm (Ender 3). YouTube description: https://youtu.be/o2_N6vdyZAQ Design details: https://youtu.be/UnK1xYAEllw Assembly: https://youtu.be/e2nFBiJyjFQ Reliability update: https://youtu.be/PmUDAcCnl1s The 68 page assembly guide can be downloaded before purchase at https://www.stevesclocks.com/sp17 The clock is engineered for reliability and ease of assembly. Despite its size, it is relatively easy to assemble. The non-printed bill of materials is quite small. You will need some 3/4" (19mm) chrome steel balls, 28" of 1/2" EMT conduit (or other metal tubing with an OD of 15-20mm), two sizes of screws, two sizes of metal rods, and two sizes of ball bearings. A complete description is in the assembly guide. Parts kits for everything except the balls and EMT conduit are available at https://www.etsy.com/listing/4537820134 The clock requires 100 to 125 chrome steel balls. Currently, the cheapest known source in the US is https://www.amazon.com/100-Pieces-PGN-Precision-Bearing/dp/B0CPQQY9C3 or https://www.ebay.com/itm/303039751637 International builders may be able to purchase balls at https://www.ebay.com/itm/273527876974 This clock is loud. The metal balls make noise as they roll along the tracks and bump into each other. The steel balls are a unique power source, but they make more noise than a weight on a string. The 10-Sep-2026 update fixes the last known reliability risk of balls getting jammed as they enter the ball drop from the upper ball ramp. This is an easy retrofit for early builders or a better overall design for new builders. Update 13-Jul-2026: Added multiple sized spiral lifting components to support tubing sizes between 15mm and 20mm. 1/2" ETM should use spiral_lift_*_18mm.Update 16-Jul-2026: Updated the Z-height of ball_drop9.stl. Please download a new copy of this file. No other stl files appear to be affected.Update 21-Jul-2026: Updated toggle_lever to the proper size. Also updated frame_h1, frame_h2_dial_roman, gear1_24_15_esc to match the diagrams in the assembly guide.Update 25-Jul-2026: Added more clearance to frame_g posts and gear 8. All known bugs have been fixed. A 2.4 day runtime option was added.Update 30-Jul-2026: Added a frame_405x405 subdirectory at the request of a builder with a large printer. Most builders can ignore this update.Update 10-Sep-2026: Added ball drop limiter to feed balls one by one to the ball drop. This is a huge re