Biqu H2 Linear Rail Mount (v2)

thingiverse

18Jul2023 Update: I finished the redesign and made more room for the pieces to adjust to rails that are slightly off-spec (they still need a 20x20 screw pattern) and made the 2 pieces fit together easier. For the belt attachment I ended up making 2 variations. The files called “bottom_belt”, the belt attaches under the X gantry as normal on most printers. The files called “top_belt”, the belt attaches above the X gantry. I think it is easier to connect the belt on the top and saw no reason not to do that. Attaching the belt above the gantry requires reversing your X stepper direction either in firmware (very simple in Klipper, Marlin requires re-flashing) or by swapping 2 wires on the stepper cable. There are plenty of resources available on the internet if you need help with either of those options. ************************************************************************************************** ***NOTICE: IF YOU CONNECT THE BELT ABOVE THE X GANTRY YOU HAVE TO *** ***REVERSE THE DIRECTION OF THE X STEPPER EITHER IN FIRMWARE OR BY *** ***SWAPING 2 WIRES ON THE STEPPER CABLE!!!!!!!!!!! *** ************************************************************************************************** I found that the belt grooves printed best when they were laying down parallel to the build plate but I included a small test block with the same belt groove you can print in different orientations to see what prints best on your printer. The only support needed is a small one on MGN12H_Mount_Bottom_Belt_(v2) where the notch for the endstop is. The wire groove on the side might drop a couple strands if you want to paint in support there but it will not affect function and will be hidden by the wires. I could not get an adjustable endstop for the top belt version so I included files for 5, 7, and 9mm which should meet most peoples needs. F360 files and step files are included if you want/need to adjust something. Printing specs: I have printed these with bot PLA and PETG and both feel fine with the following settings: Layer height : 0.2 Perimeters : 4 Infill : 42% ------------------------------------------------------------------------------------------------------------------------ 17Jul2023 Update: I encountered some issues with this and am making some significant changes. – I ended up not liking the belt connection so that is getting a complete makeover. – I tried mounting it on a carriage from a different manufacturer and the holes were about .5mm off so I need to make it able to shift a bit to accommodate carriages made to different tolerances. Hopefully it will only take me a couple days to get it back to what I would consider acceptable. ************************************************************************************************** In the process of a complete overhaul of my old Ender 3 Pro I decided to use the MAD fan system (thanks to @Predy/prezget and everyone that worked on that) but still needed a rail mount. Since I could not find an acceptable one (and saw a lot of other people looking for one in comments) I decided to take a stab at making one. This one is quite compact and only pushes the hotend about 9.3 mm out from the face of the rail carriage (14mm from the rail). I included holes for zipties and a groove along the left side and top to help with cable management. The groove is not intended to completely encase the wires, it is just a guide to help keep them from shifting. I am using a custom relocation bracket to move my endstop switch to just below the rail so I cannot verify if the included endstop will hit a stock mounted switch. No support is needed if oriented according to the included pic. The 5.7 mm heatset insert in the grooved belt platform sticks out a bit but does not affect performance ( no matter which side sticks out). Platform is only 5mm thick and I did not have shorter inserts on hand. I have included the .stl, .stp, and .f3d if anyone needs (or wants) to tweak them. 3D views available at https://www.printables.com/model/523223-biqu-h2-rail-mount It includes: MGN12H_Mount – mounts directly to the rail carriage H2_Toolhead_Mount - mounts to the H2 hotend and then to the rail mount End_Stop - An X-axis endstop with a little bit of adjustability, mounts to bottom left of the rail mount Belt_Clamp _ Screws onto the grooved platform of the toolhead mount to smash the belt into the grooves. Hardware required is: 5 x M3 x 5.7 heat set inserts 10 x M3 x 8mm countersunk screws 1 x M3 x 8mm socket head cap screw (for the end stop) zipties (all 5 ziptie holes are 1.5 x 4 mm) Printing specs: I have printed these with bot PLA and PETG and both feel fine with the following settings: Layer height : 0.16 Perimeters : 4 Infill : 42% These parts have very tight tolerance so depending on your printer's accuracy or amount of stringing or other imperfections, you might need to do some light scraping to get good a fit. I am still waiting on my new control board so I have not been able to actually print with this yet but I have completely mounted it and moved everything around and have not seen any problems. Let me know if you find a problem or notice something I missed. This is my first Fusion 360 project (a few years exp with FreeCAD) so don't trash me too hard if you are inspecting the f3d file and you think I did things “wrong”.