About this 3D model

Since my design habit is to minimize the use of supports and hardware during printing, most designs use tolerances to directly connect. Due to the printer's tolerance and the relationship between different printers and materials, there are inevitably some cases that are too tight or too loose. Some places may need to be polished or tightened with double-sided tape. Requires 4 686 bearings and 3 106 bearings, a little bit of badminton racket wrap, and a little bit of double-sided tape. For specific installation methods, please check the video on Bilibili. Below is a brief installation guide: https://www.bilibili.com/video/BV1dg4y1Z72X/?spm_id_from=333.999.0.0 First, connect the front and rear axles Since it is designed to be printed without support, this separated structure was used when making the rotating shaft. Align it with the snap-in and put it in. Rotate it slightly with pliers. It's tight enough, don't use excessive force, otherwise, it will be twisted. Then snap on this 686 bearing for later use. Next, we use these 2 106 bearings: One is snapped here. The tolerance reserved is relatively small, and you can use tweezers or a screwdriver to help. The other two are the same way, snapped here. Let's install the gear. This drive gear has a relatively small tolerance, and it needs to be inserted and then pulled out to test before installation. Then install it in place like this, leaving the suspended part alone. The bevel gear also needs to insert and pull out the shaft first. Sometimes, due to the shaking of the printer, the middle part will be a little thicker. Therefore, if necessary, it can be polished slightly. The method is very simple, sandpaper can be used, I usually use pliers to rub it a few times. Then press in the third 106 bearing, press it to the bottom as much as possible, and then put in this small C-shaped ring, which is used to limit the position. Finally, connect it with the bearing and turn it to test. Then we press in the installed rotating shaft. Here is a reference to the design of Bambu AMS. In order to limit the position of the rotating shaft more accurately, the design has been modified here, and a small step has been added. Therefore, when installing, it should be slightly bent outwards. Then we put the support frame into the opened dry box. And then connect with this shaft sleeve. What are these two small spacers for? Because the side of the dry box is not completely vertical, there is a slight angle, so you can choose to install this spacer, which can make the interface smoother. If you have high requirements for sealing, you can use glue here or add some TPU gaskets. Then install the detachable knob and that's it. Last time, a netizen suggested using a handle, a good idea, but I am too lazy to design it, haha, mainly because there is limited space here. This time, the size of the knob has been increased, which feels good to use.