I wanted to use the updated MGN9 files for constructing my Duender. This was because a number of improvements had been made to the design. Also I I would like to install rails in the future without needing to reprint all of the parts. The MGN9 has improved stacking of the flanged bearing using 0.5mm washers instead of printer shims.
I also saw the "Top Motor Mount w/ Double Shear for Duender" from Andizzle on Printables, and liked how rigidly it mounted to the frame. However this mount was not suitable for the MGN9 version.
These files are not re-mixes of the original STEP or STL files. I have designed each one from scratch in FreeCAD using just the dimensions of the original parts to make them work in place of the originals. However I deem them a remix as they are intended for the Duender, and replace the original parts in a like-for-like way.
I want to thank Sergei Irbis for the design of the Duender and providing a means for my Ender 3 to continue as a useful 3D printer.
I also want to thank Andizzle for the improved motor mounts that I have based my motor mounts design on.
This project contains a re-design of the front tensioner housings from Sergei Irbis, and they re-use the stock pulley holder inserts.
The main change is that it uses the M5x45 and M5x25 bolts from the Ender 3 (you need to tap your threads into the extrusion at least 20mm) to make for a very strong connection.
I have also adjusted the geometry to provide a solid end-stop for my newly designed Wheel to MGN9 Adapters.
Finally I played with the asthetic to get something that I like better.
This project contains a re-design of the motor mounts from Andizzle, however adds 8mm to the deck height to make them compatible with the MGN9 project.
I also removed the trianguler mount from the bottom, as in the future I will have a 20x40 extrusion there to support a 3rd heated bed mount. It seems plenty strong enough without it.
Finally it uses the M5x45 bolts from the Ender 3 (you need to tap your threads into the extrusion at least 20mm) to mount into the 2040 Y-axis extrusions to make for a very strong connection.
You need to mount both of the motor mounts to 2020 extrusion first, as the M5x45 bolts prevent access to the bolts that go into the end of the 2020 extrusion. Then you use the M5x45 bolts to mount the assembly to the frame.
Note that this redesign moves the bolt positions somewhat, so that you cannot mix and match the top and bottom parts from Andizzles project. The belt path remains compatible so there should not be any effect on kinematics.
This is the mod I first started working on. I was looking for options not to have to buy a sheet of aluminium then drill and cut the plates. I used purchased open-build plates for the Z axis, but this doesn't work for the X gantry.
I noticed that the V-wheels posiion the plate approximately 4mm above the top of the extrusion, where as an MGN9 carriage positions it 10mm above the extrusion. It is known that the aluminium plates cannot be 3D printed because 3mm thickness is not rigid enough.
So I thought that if I 3D printed a 6mm plate that should increase rigitity and bring the alignment in line with an MGN9 carriage. So I decided I would design a 6mm adapter than would look like an MGN9 carriage for the stock parts to mount onto.
I have done a few revisions of this in order to move the inner wheel out of the way of potential toolheads. I also had to move the rear outer wheel back to provide stability against twisting. I believe it works well as a stop-gap until you can install rails. The only negative is that you cannot adjust the wheel tension without removing the stock parts from the top. So make sure you adjust the wheel tension before full assembly.
This mod adds support for using an MGN12H linear rail and carriage for the X axis.
I feel that these size rails mount better on the V-slot extrusions, and MGN12 is the current X axis standard for DIY printers like the Vorons and others. It opens up more options for alternative toolheads and mounting systems. The only con being that the nozzle is pushed further forward.
What is EMS? It is a system for managing the electronics for 3D printers from FizzyTechs. It consists of a panel with hexagon cutouts, a set of hexagon shaped plugs that fit into the panel, and a repository of mounts for various 3D printer electrical components. The idea is that if you replace a component, or need to move one around, you can just print the mount for the new component, or move the plugs to a different cutout. There are also plugs for zip-ties, and a set of cable ducts for solving any cable management issue.
https://www.printables.com/model/558357-ft-ems-mounts-repository