Another Berry Tripper

thingiverse

This is a remix from Berry Tripper. Basically parts I used from http://www.thingiverse.com/thing:86631 to make what I have shown. I am using "MW_LargeHerringBoneFinal_Plugged.stl" to print the large Herringbone gear with the correct M5 nut size as shown in the photo gallery. A SKP file is also provided which is an STL import of the original file but with modifications. Obsolete files will not be removed but don't use them unless you want to.OBSOLETE I had trouble printing the large herringbone gear to fit a M5 screw. It looks OK but when printed, it would fit a M8 bolt instead. So to work around this, a 8MM OD 5MM ID spacer was inserted into the center and a nut retainer sized for M5 hex nut was created to make it all work together. OBSOLETE This is just one possibility out of the many options out there. This happened to be my take on it though I hope this can be of some use to someone else... See instructions for details. Special Thanks goes out to berryd for posting Berry Tripper and Airtripper for the original design and inspiration.http://www.thingiverse.com/berryd/designshttp://www.thingiverse.com/Airtripper/designs Instructions Updated 8/17/14 Added MW_LargeHerringBoneFinal_Plugged.stl and SKP file. No longer do you need to print the nut retainer to work with the large gear. Use MW_LargeHerringBoneFinal_Plugged.stl instead. Updated 8/8/14 Added bowden_threaded_adapter_modified.stl and SKP file. Updated first image to reflect adapter installation. Keeping previous images as reference to alternative but less desirable method of installing the "Push-to-Connect Tube Fitting". Made a comment about using the value 195 instead of 170.99 as the Steps per MM for extrusion. Updated 8/6/14 Removed part "M5 Precision Washer x 1". Part already posted under the name 5x8x1 Shim. Tips So that you don't need to count like I did when I see gears; big gear has 39 teeth and small gear has 11 teeth. If you notice there isn't a lot of filament being extruded, check to see drive gear teeth are clean and if the drive gear is spinning freely. These are the main causes when I get poor extruding performance. Use "MW_LargeHerringBoneFinal_Plugged.stl" to print the large gear.OBSOLETE Print the LargeHerringBoneFinal_Plugged.stl and see if it fits a M8 bolt or a M5 hex nut. M5 hex nut fitting is what you want but most likely it will be for M8, so print "Nut_Retainer.stl" and use the 8mm OD spacer. The Sketchup SKP file is also included if you need to adjust the size. OBSOLETE For both gears and nut retainer, I used PLA and these slicing values: .2 layer height 80% infill 1 shell/perimeter 3 top and 3 bottom shell The body, idler and strut uses similar values but with 20% infill instead. Tools I used: Cordless Drill 3/32 bit to clear filament holes 7/64 bit for M3 hole 13/64 bit for small Herringbone gear motor hole. 5/32 bit to prep tap hole for Bowden adapter M5 tap for Push-to-Connect Tube Fitting Xacto knife & Utility knife to clear those PLA bumps and whiskers. Hand file to remove PLA from inner walls of the idler so the 608 bearing would slide in easier. Bearings, Spacers, Shims and other Parts used: Inner Diameter (ID) Outer Diameter (OD) Bearing Width (BW) IDxODxBW 5x10x4 Miniature Ball Bearings x 2 8x22x7 608 Bearing x 1 5x8x1 Shim 5x8x6.35 Aluminum Spacer x 3 MK7 Drive or similar (10.56 Diameter value) M5 55mm bolt x 1 M5 hex nut x 2 M5 lock nut x 1 M3 12mm screw x 3 (NOT SHOWN in group pic) M3 40mm screw x 2 M3 50mm screw x 2 M3 washer x 6 M3 hex nut x 4 SMC KQ2S04-M5A Brass Push-to-Connect Tube Fitting, Hex Socket Head Adapter, 4 mm Tube OD x M5x0.8 Male Some kind of small screw and nut that fits inside the nut slot of the small gear. The springs are something you can pinch squeeze so not to be fighting it during installation. Determining my e_steps_per_mm: Source: http://reprap.org/wiki/Triffid_Hunter%27s_Calibration_Guide e_steps_per_mm = (motor_steps_per_rev driver_microstep) (big_gear_teeth / small_gear_teeth) / (hob_effective_diameter * pi) 170.99 ? (200 8) (39 / 11) / (10.56 * 3.14159) I am currently using the value 195.00 and getting good results with E3D V6 at 208C. Not an exhaustive list of notes: -- The small gear on the motor (when facing you) should rotate clock-wise while extruding. I HIGHLY RECOMMEND that M5 screw is FILED where the MK7 Drive set screw locks in place so it has less of a chance to spin freely when encountering a jam. There are printed Bowden parts from the source of this remix, I just chose to use an already available part and some drilling/tapping. I plan to connect this to an E3D V6 hotend "1.75mm Universal" not the one with the "Bowden extras" purchased from http://filastruder.com Some of the parts (5x10x4 bearing, 5x8x1 shim, etc) can be located at http://openbuildspartstore.com I am just a happy customer from the two websites listed above and I am not associated with them. The Bowden adapter hole is not centered. Please be mindful of this during installation so the holes align. May need to file sides of part or modify the SKP file to work with your prints tolerances. I will work on posting the pics with descriptions off site but for now hopefully the pictures help instead of hinder. Thanks for reading all the way down here...