SpeedDrive Ender 3 - light & no supports (+ dual gear)

thingiverse

Based on great design https://www.thingiverse.com/thing:3816051\r\n\r\nVery light and simple design that doesn't need support\r\nCompared to original, solid print, difference is 11 grams (32 vs 21) which is an obvious plus for direct drive extruder\r\n\r\nThere are two versions and both are to be printed without supports.\r\nFirst version is for stock Ender 3 extruder, while second is for dual gear extruder (https://www.aliexpress.com/item/33042360504.html?spm=a2g0o.productlist.0.0.5fb426cbTxWDI)\r\nNote that second one requires endstop spacer due to taller extruder which I also added 0.5mm longer as original was tad too short in my setup\r\n\r\nIf you want to use existing extruder motor, you need to print endstop spacer even for stock version, otherwise you can use a smaller motor like all of the other motors that are on Ender 3\r\nif you don't have spare thinner one or don't want to order one, simplest is replace extruder motor with the x-axis motor\r\nif you take it from the y, you will need to offset the axis endstop as otherwise motor will hit the bed - https://www.thingiverse.com/thing:3398302\r\nif you take it from the z, then you will need to use t-nuts or drill new holes to mount taller extruder motor or use a holder like https://www.thingiverse.com/thing:3370669\r\n\r\nBest to print with PETG or ABS with 4+ shells but ~20% infill to keep it lighter\r\nhttps://youtu.be/AmEaNAwFSfI?t=496\r\n\r\nUsing lower layers like 0.12 - 0.16 should be better https://youtu.be/fbSQvJJjw2Q?t=666\r\n\r\nPLA is fine but make sure to run as low vrefs as you can to keep the motor cool, otherwise PLA will deform with time since motor will also run hotter due to not touching any metal frame to cool it\r\n\r\nYou can also try annealing PLA but that will change dimensions\r\n\r\nHoles for mounting on the wheels will be very tight so best to insert it by heating like with solder iron for inserts\r\nhttps://www.lulzbot.com/learn/tutorials/heat-set-inserts-tips-and-tricks\r\n\r\nThis requires custom size PTFE tube which can be cut as wanted during mounting