Mountain Bike

thingiverse

I've made this little bicycle to be relatively strong, with movable parts. I've printed all the parts with success. Supports only needed for rear frame. You can see the video here: http://youtu.be/AnqlYZzgOo0 Update: assembling finished! Well, I only have natural color PLA, but I think it's nice anyway... :) Added a new set of cranks and pedals - new fit. Not tested. Now, you can print the rear wheel with the sprocket in one piece. I've added a modified version of the rear frame, too. If you want to modify it, the original Sketchup file was added. Instructions 1 - Fit the chain ring into the cranks and then snap the pedals. 2 - Mount the 2 parts of the frame with the cranks set in place. Use 2 screws for that (2mm screw - 5mm length). 3 - Mount the front wheel in fork with a screw (2mm - 15mm length) 4 - Fit the sprocket in rear wheel and insert them in the rear frame. You will need to open it a little (be careful to not brake it). After that, fix the wheel with a screw (2mm - 20mm length) 5 -Place the saddle in place (glue it if you want) 6 - Insert the fork in the front frame and fix the handle bar with glue. 7 - For the chain you can use a rubber band or a piece of thin rope. Don't use a too stretchy rubber, or it will stretch a bit, even if your wheel is loose. You will need to cut the rubber and slide it thru the clearance between the rear wheel and the frame (hollow part). It will lay right on the sprocket. Pass the upper end thru the upper frame connection and somehow glue the ends together. I achieved an almost perfect junction gluing the ends with cyanoacrylate based glue. Just a touch will do it. The two indentations on the holow part will allow the 'chain' to pass through the frame. I've made this to shrink the frame sideways. Notes: I have printed the big parts with .2 layer, 15% infill, 2 shells. The small ones I printed with .15 layer. You can see the different hole sizes. So, insert the screws in the bigger ones. Some sanding may be required to free the parts, specially the rear wheel.