About this 3D model

WDT is an art. Its chaotic nature takes skill to master consistently. Umikot is a Tagalog word which means: to spin; to turn around; to revolve; to rotate; to circle; to go around; to swirl; to gyrate. In that spirit, this 3D printable tool utilizes a print-in-place planetary gear mechanism to create spirographic needle motion. This is the 58mm version. Looking for the 54mm version? See here. Like what I'm doing and want to share the love? Buy me a coffee – any donation is much appreciated (paypal.me/vjapolitzer) ? This design is provided to you for free under a Creative Commons CC-BY-NC-SA license. Make and enjoy, but do not sell. Check out the latest and greatest version featured by Brian Quan: OnShape Sources Make it your own! Custom needle depth, tweak tolerances, or remix! Easily export STLs and STEPs. Check out the open source design on OnShape. (Note: when exporting STLs, make sure you select Units→Millimeter and Resolution→Fine.) 58mm workspace 58mm S (Short) workspace Changelog UPDATE February 3 2024: V2.1: Thicken the stationary needle post for easier printing UPDATE September 2 2023: V2 release! New for V2: Maximum coverage for needle pattern (due to this change, V2 is all new and not backwards compatible with previous release candidates, nor V1.7) Stationary edge-needle - one needle has been repurposed to a perimeter sweeping role. This reduces hotspotting in the center and improves distribution at the edges Needles insert from below - easier replacement with less disassembly LongTab version - better needle protection and easy to use. Also, ShortTab and NoTab versions to support tamping stands. Magnets only available for NoTab version, but if you really want magnets, that can be easily generated on OnShape. Improved basket lip interface Shorter threaded portion on the base - faster to print and faster to swap Optional 58mm~S ~ (short) upper parts for needles with shorter, 20mm handles. More compact design! STLs only on Printables - fewer files for me to manage for updates. Export STEPs from OnShape if you want them! All prior files and instructions placed into zip archive. The previous OnShape workspace can be found here UPDATE July 15 2023: Added tip for random z-seam for Upper Mech to improve smoothness and reduce snagging UPDATE July 5 2023: V2rc1 Upper Mech and Spin Ring - reduce lateral play and integrate spin grip Release candidate - needs more testing! Mine works great, but let's improve this together! Reduced radial forces on the gears help with binding issues The V2rc1 Spin Ring is bushing style. Lubricate with some paraffin wax for smooth action V2rc1 Spin Ring is NOT backwards compatible with previous versions of the Upper Mech UPDATE May 29, 2023: V1.7 Upper Mech and Spin Ring - Improved mechanism smoothness. Reduced helix angle for more forgiving print. Outer lip on Spin Ring to better stabilize and hold the gears at their ideal vertical position. V1.7 Spin Ring is backwards compatible with V1.6 Upper Mech. See updated assembly instructions for achieving good alignment ("Attach the spin ring and handle" step) UPDATE May 20, 2023: Compensate for material shrinkage, more forgiving basket fit (58mm) UPDATE May 18, 2023: Initial release of 54mm version for Breville machines! The magnet versions have not been tested for fit of the magnets - please let me know if you can test this. The hole tolerances may need to be tweaked. V1.6 Upper Mech: Improved tolerance for both 58mm and 54mm. Calibration to achieve ~0.2mm XY tolerance is advised. A common problem with many commercially available WDT tools is that they utilize concentric motion, which creates trenches in the coffee. The spirographic pattern avoids needles crossing the same path, with the goal of a more homogeneous particle distribution. I have optimized the needle pattern for even coverage, and no more than 8 rotations of the handle should be necessary. Two different needle lengths provide deep and top of the bed distribution. The needles are inserted from the top and are replaceable, and the base is swappable, allowing for configurable needle depth for different baskets, without needing to change out the needles. Optionally, you can print versions of the base that can house eight magnets and/or include a flange to interface with the portafilter lugs. A little de-bossed label to indicate a given base's depth is included for easier identification. Instructions Gather your parts and materials. For the non-printed things, you will need: 5x M3 x 12mm flathead/countersunk screws (if you have non-flathead/countersunk screws you would like to use, try the noCountersunk files) 10x 0.35mm acupuncture needles with a 30mm handle (Compatible with the same as the popular 9-prong tool, 0.35x75mm from aliexpress ) OR! 10x acupuncture needles with a 20mm handle for the 58 s (short) upper . 30mm handled needles can work with the 58s upper, but the handles will reach the basket lip with the 25mm depth base. [OPTIONAL] 8x 5x3mm magnets for the each b