Printhead CoreXY - Mosquito & LGX-Lite & 8mm inductive probe & 20mm flex tube cooling air connection

prusaprinters

After using the EVA 2.4 for a long time I realised, that if I want to move forward with the acceleration tuning, I need a specialised, low-weight and robust printhead. This model is made for following components / configuration:LGX LiteMosquito Magnum40x40mm hotend cooling fan8mm pinda probe9mm beltsMGN12 linear rails, mounted to the bottom of the X-gantrySensorless homingOn my V-core3 500^3 this rigid printhead design helped me to get rid of secondary bumps on the shaper graph:Y-axis: 3.600mm/s^2 - 2HUMP_EI   →   5.000mm/s^2 - MZVX-axis: 10.900mm/s^2 - 2HUMP_EI   →   16.200mm/s^2 - MZVall measurements were taken with an ADXL mounted to the nozzle's place with a printed adapter. In my oppinion, every other mounting place for the ADXL will not give you an accurate result. With the nozzle method you will get much worse shaper results compared with other mounting methods. But hey, that is the reading you need to see, dont fool yourself with a resonance graph taken on a wrong place.Regarding the printing and assembly:for the printed parts you have to use a well calibrated printer, because the design is not forgiving with tolerances. Every part has a tight fit. Please dont forget to set a shrinkage value for the plastic you are using in the slicer, mine is PLA - 99.8%dont use PETG or ABS, their E-modul (flexural modulus) is too low if you want to make a stiff printhead. I intentionally use PLA for rigid parts due to their high E-modul. What I used: https://c-3d.niceshops.com/upload/file/Technical_Data_Sheet[3].pdfFor the parts which need support I uploaded one model without supports and one with pre-designed supports. Layer height is 0,25mm.Print with 5 or maximum 6 perimeters. For the infill use whatever you prefer, it will not bring any improvement for the part stiffness anyway.I use M3 x 5,7mm brass inserts, shorter lengths will work as well for sure.For the front belt fixing on the main body you will need 2 pcs diam.3x30mm steel pins.Two brass inserts are a little tricky to insert on the main body, they have to be pushed in very deep trough a relative small channel. Sorry for that. To accomplish that, you will need a soldering tip with max. 4,8mm diameter and minimum 35mm length. After the inserting you probably need to grind off some mess as well. You will not like this part, but I promise, the rest is super straight forward.The longest screw you will need is M3X50mm, these are probably the most important screws for the whole assembly. So prepare/buy 2 pcs in advance.You will not find any cable holder part on the printhead. Not because of lazyness, I just wanted to avoid some unpredictable shaky things on the printhead. I cabletied everything to the 20mm air tube. Not pretty, but effective.The 20mm (inner diameter) air supply tube I used is the following one: https://triasztomlo.hu/termek-pdf-letoltes/airflex-muanyag-elszivotomloI also uploaded additional, useful models, so you have the whole project from one source:7530 fan mounting to the printer frameXY-joiners for flipping the rail to the bottom side of the X-gantry. Left and right have different slot sizes for the 20x20mm carbon tube, because carbon tubes have usually due to the manufacturing method a different dimension on each side (mine has 20.0 x 20.0mm on one side and 20.5 x 20.5mm on the other side). Please check your carbon tube in advance and align during the assembling accordingly to avoid too loose connections with the joiners.The 20x20mm carbon tube I use: https://www.aliexpress.com/item/1005004002385543.html?spm=a2g0o.order_list.0.0.492e1802iLcxI8Very important: use screw washers wherever possible!List of screws needed for the assembly:M3 x 8 - 12 pcsM3 x 12 - 2 pcsM3 x 20 - 2 pcsM3 x 50 - 2 pcsM3 x 8 flathead - 6 pcsM5 x 45 - 2 pcsM3 nyloc nut - 1 pc (insert it for the pinda probe fixing screw)M2 x 10 (or 8) you received with the Mosquito