Update 3/6/24

Some users have experienced issues with fitting the magnets in the holes. The design is meant to have the magnets press fit into the holes, so there's some expectation that they are a bit tight. There is apparently some variance in sizes on the ordered magnets from Amazon. In order to provide flexibility with the sizes, I've created a test print that has 3 sizes, represented by A, B, and C. A is the original size I designed for, B for the size that's been reported, and C as the full size magnet of 20 x 5 x 2.

There was a minor update to the pins to include a brim to increase the print reliability.

Rear vent hose adapter for Bambu Labs X1C/P1S printers.

This is designed to provide an easy attachment method for connecting a 3 inch or 4 inch vent hose to the back of the X1C and P1S printers. Its intent is to be an alternative attachment solution for a different vent adapter I created. My other adapter requires you to either tap m3 threads into the holes around the rear fan or use machine screws to attach the base plate. Per user request, I made a different style that does not rely upon additional hardware or tools.

The hose adapter utilizes magnets in order to create an attachment method that can be easily removed for maintenance or for moving the printer. The magnets utilize the metal back plate of the printer to attach to. While this works, it does not make for a very sturdy purchase, as the magnets are prone to move/slide around. In order to solve this problem, I created a base plate that is used to guide the adapter into the correct position and prevent it from moving/sliding around once in place. Since the base plates only purpose is to act as a guide and support, it does not experience a large amount of forces when attaching and detaching the hose adapter, which means I can get away with not needing to use 4 screws to hold the base in place. So instead I created plastic clips that utilize the holes around the rear fan to attach the base plate to the back of the printer.

Installing the base plate utilizes the 3 empty holes and 1 screw hole that surround the rear fan exit.

The existing screw is the primary mounting point, while the 3 clips act as support.

I designed two styles of clips that provide different approaches to hold the base in place.

The first is a basic push pin that you press into the hole and it stays in place via friction. This does well, but I'm not certain of longevity, so I made a threaded screw as an alternative. Since the holes aren't threaded, the screw doesn't actually thread perfectly into the hole. You basically screw it in while applying force in order to “thread” it in. Once it's fully inserted you can screw it in just a bit further until you feel it firmly grab; it kind of cams itself into place. The screw creates a much more stable attachment, but at the expense of being more difficult to install and remove if necessary.

The only work you will need to do for the hose adapter is to install the magnets. The magnets I used were sourced from Amazon and are 20x5x2mm. Like most things from China, these don't quite measure accurately. The magnets true measurements are more like 19x4.5x1.8 and so the magnet slots are designed to fit these measurements. The magnets are meant to press fit into the slots while slightly protruding in order to create the strongest magnetic connection. Some magnets don't quite fit as snug, so you may need to apply CA glue if necessary. The hose adapter diameter is a bit undersized on purpose. It's easier to fit and clamp the hose onto the smaller diameter, I hate fighting to clamp on vent hoses.

The printing requirements are pretty basic.

• The base plate needs no supports
• Clips need supports, printed horizontally for strength, and a .12 layer height
• Hose adapter only needs supports

Parts I used:

• 20x5x2mm (19x4.5x1.8) magnets: https://a.co/d/67ABQKQ
• Black 3 inch vent hose: https://a.co/d/acagw97
• Silver 4 inch vent hose: https://www.lowes.com/pd/IMPERIAL-4-in-x-96-in-Foil-Flexible-Duct/4566284