... print your plane | www.3DLabPrint.com User Guide rev. 2019/12 Fully 3d printable North American B-25J Mitchell 12:1 ~ wingspan 1.
... print your plane | www.3DLabPrint.com North American B-25J Mitchell– fully printable R/C plane for your desktop 3Dprinter Future of flying - Print your own plane. flight video The really first 3d printable bomber plane. This even bigger evolution including some revolutionary features. For the second time this model uses new method of joining parts, really, now on most of parts - stronger, easier to assemble and more precise. This plane can be recommended to medium skilled pilots.
... print your plane | www.3DLabPrint.com General specifications: Wingspan: Length: Height: Wing area: Wing loading: Center of gravity: Airfoil: Weight of printed parts (w/o wheels): Takeoff weight (4s 5000mAh Li-Pol): Max takeoff weight: Never exceed speed, Vne: Design max maneuvering speed, Va: Stall speed Vs: 1720 mm / 68 inch 1360 mm / 53,6 inch 400 mm / 15,7 inch 43 dm2 / 4.7 sq ft 83.2 g/dm2 / 27.3 oz at sq ft 83mm / 3.27 in from LE 3DLabPrint semi 04 1980 g / 72.
... print your plane | www.3DLabPrint.com North American B-25J Mitchell, History The North American B-25 Mitchell is a medium bomber that was introduced in 1941 and named in honor of Major General William „Billy“ Mitchell, a pioneer of U.S. military aviation. Used by many Allied air forces, the B-25 served in every theater of World War II, and after the war ended, many remained in service, operating across four decades. Produced in numerous variants, nearly 10,000 B-25s were built.
... print your plane | www.3DLabPrint.com Included: 1. STL 3d files Universal STL files designed for use with desktop FDM 3D printers and slicer software such as Simplify3D (recommended) CURA or MatterControl (these STLs are not compatible with Slic3r/PrusaSlicer or Makerware slicers). 2. Factory files for Simplify3D slicer With all our settings, these Factory files include all you need.
... print your plane | www.3DLabPrint.com 4. Gcodes Basic Gcodes prepared for direct use. We made it as universal as possible, 100% compatible with PRUSA i3 ORIGINAL and most i3 style printers. Feel free to try it out, but we‘re not able to guarantee it‘s gonna work with your printer. 5. Prepared settings for CURA and MatterControl slicers If you can‘t use Simplify3D for any reason, we provide our basic configuration files for free slicers CURA and MatterControl.
... print your plane | www.3DLabPrint.com Centre of Gravity Wing area: 43 dm2 / 4.7 sq ft / CoG is 83mm /3.27 in from LE Lenght: 1360 mm / 53.
... print your plane | www.3DLabPrint.
... print your plane | www.3DLabPrint.com Step By Step PDF/VIDEO userguide (please go through all videos) Choose airplane at www.3Dlabprint.com. Our Facebook for live information. Basic requirements for our B-25J are: at least 200/200/200mm build volume. Nozzle 0.4mm recommended. Heated bed highly recommended. PLA filament (or PETG, APLA, htPLA, PC-max.... not ABS) and some flex for tires...
... print your plane | www.3DLabPrint.com option B FACTORY files for Simplify3D (recommended) We prepared all you need in the factory files (basic FFF profiles, parts arranged on the bed, etc.) Use our settings as a starting point and edit according to your needs (adapt it for your printer), choose the parts to print etc. Most 3d printers should be ok with files as they are, however if you need some customization, please do so. We are not liable for any damage resulting from the use of our settings.
... print your plane | www.3DLabPrint.com option D CURA or MatterControl (considered as the last resort, we recommend Simplify3D) MatterControl and CURA are free and provide good results. The airframe is still strong enough, but don‘t expect the best quality. Both slicers lacks some very useful features, and finer settings, like multiple processes according to Z height, retraction options, layer start, etc.
... print your plane | www.3DLabPrint.com 3. Print it Save generated Gcodes and insert SD card to your printer, prepare your printer and start printing. We prefer to use SD rather than a direct connection via USB Note: ABS filament is not suitable for this. Scaling the model will lead to unusable result! Note: ninja flex or simmilar fillaments can stick very hard to PEI based surfaces be careful...
... print your plane | www.3DLabPrint.com Basic Tips and Advice Please experiment with your extrusion multiplier to achieve the similar weights as in the list. HotEnd temperature is very important for a strong result. The reason is, the plastic leaving the nozzle has to melt the previous layer to create solid joint. Please print the thinwall temperature tower to find the best hotend temperature value (215° up to 260° Celsius) to achieve strong strong layer bonding without underextrusion on layer starts..
... print your plane | www.3DLabPrint.com 4. Assembling printed parts 4.1 Wing assembly (including Engine Gondola) See video guide #4.1 you will need: CA Glue - medium or similar medium viscosity CA glue Activator for CA Glue or similar, (gas presurized works better) Soldering Iron or any hot tool to cut holes 1.75-2mm rod/axle for flap hinge (we use fillament or toothpick) sound as a option (ESS-AIR Engine Sound System) + cable extension Proceed the way shown in videoguide: See video guide #4.
... print your plane | www.3DLabPrint.com Proceed the way shown in videoguide: See video guide #4.1 Start with glueing the engine gondola and wing1 parts (shown in the picture below): If you want to use engine sound system, this is the time to install the self-adhesive vibration speakers, use a hot tool to cut the hole for speaker cable (the smaller area marked red in the picture).
... print your plane | www.3DLabPrint.com Continue with R and L motor mount, note: for proper function there is angle compensation for propeller slipstream so right orientation is essential, see the pictures below): !ANNEALING! We suggest to anneal the PLA motor mount. You can use this procedure: submerge in boiling water for more than 30 minutes (pla is then much more heat resistant).
... print your plane | www.3DLabPrint.
... print your plane | www.3DLabPrint.
... print your plane | www.3DLabPrint.
... print your plane | www.3DLabPrint.com Apply CA glue to the contact surface of the part (marked red in the picture) and insert it to the main wing part.
... print your plane | www.3DLabPrint.com For flap hinges you can use any 1.
... print your plane | www.3DLabPrint.com 4.2 Fuselage assembly You will need: CA Glue - medium or similar medium viscosity CA glue Activator for CA Glue or similar, but gas presurized aerosol is better Soldering Iron or any hot tool 2x 3.5/20mm (max 4/30mm) self tapping screw Proceed the way shown in videoguide: See video guide #4.2 The weight of parts can vary +/- 8% due to diff PLA color or brand...!!! top_gun 21g/0.74oz F9 35g/1.23oz F7 61g/2.15oz F5 82g/2.89oz F3 74g/2.61oz batt cover 32g/1.
... print your plane | www.3DLabPrint.com Proceed the way shown in videoguide: See video guide #4.2 Glue the fuselage parts F2-F3 with CA glue together. You can use snap knife to clean the shape of printed parts, but mostly this is not necessary.
... print your plane | www.3DLabPrint.com Proceed with glueing fuselage bomb cover parts together and use two self tapping screws to mount it to the fuselage: Glue both top_gun turret parts together: Now battery cover...
... print your plane | www.3DLabPrint.com Now glue the inner wings part with gondolas into the fuselage. Test fit the parts, then apply CA glue to the contact surface on the wing (marked red in the picture) and insert to the fuselage, finally apply the activator: Proceed with the opposite side.
... print your plane | www.3DLabPrint.com 4.3 Fuselage tail and assembly. Now it‘s a good time to assemble the tail stabilizers, elevator and rudder. Proceed the way shown in videoguide: See video guide #4.3 You will need: CA Glue - medium or similar medium viscosity CA glue Activator for CA Glue or similar, but gas presurized aerosol is better 8x 3.5/20mm self-tapping screws 12/750mm carbon tube 1.
... print your plane | www.3DLabPrint.com Proceed the way shown in videoguide (pictures will help you): See video guide #4.
... print your plane | www.3DLabPrint.
... print your plane | www.3DLabPrint.com Assemble the rudder: For rudder hinge use a 1.2-1.5 mm wire or carbon rod.
... print your plane | www.3DLabPrint.
... print your plane | www.3DLabPrint.
... print your plane | www.3DLabPrint.
... print your plane | www.3DLabPrint.com 5. Servo installation You will need 4-12 servos (micro size 21/12/22 HXT900, G90 or compatible) 4 servos for both ailerons and elevators is absolute minimum (just fix rudder and flaps) to fly the plane, yes you can bank‘n‘yank like this, but adding two more servos for rudder (+one for nose wheel steering) makes taking off much easier and flying coordinated turns looks much better :-).
... print your plane | www.3DLabPrint.com Proceed the way shown in videoguide (this pictures will help you): See video guide #5.1 Start with connecting the servo extension cable. Center servo to its neutral position (use your RC system or servo tester) and attach the included servo arms. Note: in case you want to use all the servos (and rectractable LG), you might want NOT to use servo extension leads, but solder the wires directly. It makes running the cables through the tunnels easier.
... print your plane | www.3DLabPrint.com Proceed the same way for elevator as ailerons, only insert the steel wire in to elevator bowden: Center servo to its neutral position (use your RC system or servo tester). Attach the prepared servo arms. Remember that you must slide all the servo cables in to the „servo cable tunnel“ and the servo cable extension must reach the battery/receiver comparment in the nose of the fuselage.
... print your plane | www.3DLabPrint.com Center servo to its neutral position (use your RC system or servo tester) and attach the included servo arms. Make Z bend on the end side of the wire then insert it in to the rudder arm hole, then use some gauge or just pen and mark the position of the servo arm. Cut the wire and make Z bend. Release servo and slide the Z bend wire in and put the servo again in rudder servo slot in vertical stabilizer.
... print your plane | www.3DLabPrint.
... print your plane | www.3DLabPrint.com 6.1 Landing gear (retractable) In this step instal both main LG to each engine gondola, and one nose steering LG... Of course you can use alternative LG Retracts, use suitable hot tool to enlarge the LG comparment if needed. You can aslo use just fixed landing gear and safe some receiver channels (see the 6.2 guide in the end of this chapter).
... print your plane | www.3DLabPrint.com Proceed the way shown in videoguide (this pictures will help you): See video guide #6.
... print your plane | www.3DLabPrint.com Relase both side screws in the LG units and remove the included 5mm LG pin. Insert the prepared main leg with wheel, properly tighten the side screws, you can make seating pads with dremel (likewise the included ones) and use thread locker (Loctite) here. Insert completed main LG in to the slot and secure with self-tapping screws again.
... print your plane | www.3DLabPrint.
... print your plane | www.3DLabPrint.com 6.2 Landing gear (fixed) You can aslo use just fixed landing gear and safe some receiver channels, but of course flight characteristic will suffer from aerodynamic drag (will be not so smooth and stable) You will need: Light Foam Main Wheel or any similar 85-90mm Nose wheel or any similar 45-60mm Landing Gear Wheel Stop Set Collar 9x5.1mm or similar 5 mm wire/rod for LG leg 18x 3.
... print your plane | www.3DLabPrint.com Proceed the way shown in videoguide (this pictures will help you): Insert 3d printed LG unit socket into the engine gondola then use any hot wire (roceed the same way as with retractable LG) and make hole for four self-tapping screws. Secure the retract unit using all four self-tapping screws.
... print your plane | www.3DLabPrint.
... print your plane | www.3DLabPrint.com 7.1 Decals/Marking Use our prepared PDF marking - Cut decals from thin advertisement foil or use any local advertisement or graphic company. Apply it to your model by your choice. You can use also use our prepared shapes/patern (PDF) and make own paint work. This aircraft can be painted with any waterproof acrylic colours. Please use your favorite procedure there are many options, so it is hard to recommend any exact solution as the best. 8.
... print your plane | www.3DLabPrint.com 9.1 Final completion and setting Install your receiver, connect servo cable, setup servos and etc. with your trasmitter, check servo position. Set recommended deflections. Check CoG point CoG is 83mm /3.27 from the Leading Edge of the wing, see the CoG tags on wings. As the last step install propeller. It is generally ideal to correct the center of gravity by the weight of the batteries and not by adding lead to the nose or tail of the aircraft.
... print your plane | www.3DLabPrint.com 10. Pilots Please Attention! Make sure the battery is well fixed in proper position. If it moves during flight it will cause the CoG move aft and can lead to uncontrollable flight behavior. Standard CoG is 83mm / 3.27 from the Leading Edge of the wing (see the CoG tags on wings). NOTE: always use appropriate throttle when flying with extended flaps (above stall speed).
