About this 3D model

Boost Me If you found this model useful, consider boosting me to help support future projects! This is a massager for your muscles/back. It's official product name is “lunar rover massager” that used to be quite popular in China. We had one in the family for 20+ years. Recently my mom broke my grandma's, and asked me to fix it. Instead of just fixing the broken handle, I just recreated the entire design in Fusion 360, and optimized it slightly for FDM printing. Printer Settings: 0.4mm nozzle 0.12mm layers 4 perimeters Gyroid infill, 15% Tree support for the handle Normal support for everything else Print Parts: 1x handle 16x wheels 8x short leg 4x long leg 4x long peg/pin (used for attaching long leg to the handle) 16x short peg/pin (used for wheels) 8x peg/pin with protrusion (rotation limiter for short leg attachment to long leg) Assembly Notes: Make sure the parts fit losely/turns - trim/sand slightly if not (designed with 0.5mm gap) gently hammer/tap the pin/peg into place Use some lubricant (silicone or whatever you use to lubricate your printer screws) would make the wheels spin more freely if your printer's tolerance isn't as good Wheels have an inside and outside - the side with shorter “bearing” faces outside so the pins sit flush Updates Feb 22, 2024: new version with significant updates to how the pins/pegs work, now stronger and more “round” for better tolerances and wheel spin.