Robot lawn mower LIAM

thingiverse

My little version of Uncle Marcus 3d printed Liam. Everything is printed in PETG except for the cutter bracket that is in Polycarbonate, which adds a bit more strength and heat resistance. I made some adjustments to the available files so I could use acrylic glass, plexiglass, or plywood sheets as a cover, along with screw holes that fit an m5 nut (although I ended up using m4 because my printer couldn't maintain the tolerances). To seal everything properly, I glued rubber strips around the edges. In addition to that, I designed a new cutter disk that I think will work with several different Liam clippers. The one included hasn't been tested by me, but I'm using another slightly more complicated variant that isn't well-suited for 3d printing. The new disk consists of two components attached together. The purpose of the cutter disk bottom is to prevent grass and other things from accumulating at the blades and screws, although it might have the opposite effect. If you try it out, let me know if it works okay or not. The disc fits the NIDEC with an M8 adapter purchased on microcutter. I also designed a new protection to keep fingers and cats (like mine) away from the blades. It's inspired by the one found in Liam 6 but slightly larger, and the holes for attaching it to the mower fit into the three holes where the mower motor sits. I made the holes a bit bigger since they don't get completely straight when gluing the various components together. Just make sure you have a slightly larger washer so it works well. To secure the cover and cutter motor, I used m4x50 screws. The cutter disk and cage were drawn in fusion360. If you want to modify them, let me know, and I'll send over the files. I also included some unmodified files, so everything is collected in one place. Some other tips: use an m8 threaded rod for the front wheels, 608 ball bearings (make sure to use washers between the bearing and plastic, as the plastic will otherwise stop them from working). Lock nuts are recommended. Polycarbonate is a pain to print with, so avoid it if you can! You can find all the components on microcutter.se/shop, along with a facebook group and github page filled with lots of information.