Stop It! Z Endstop & Chamber Thermistor Mount for Voron Switchwire

What is this?

This mod adds the following small quality of life improvements to any Voron Switchwire (or really any 3030 based printer):

• Rigidly mounted Z endstop away from the bed
• Chamber thermistor mount point away from heat generating components (like extruder stepper drivers on many toolhead boards)
• A small cable guide if you run wires up to the top of your frame (examples include LED strips, CAN or camera cables, thermistor and endstops)

Why do I want it?

In my year or so printing on my Voron Switchwire, I've found it to be a very capable machine.  However, it's not without a small flaw that continually frustrated me during my time with my machine and served as the inspiration for this mod:

• It relies on a virtual endstop (inductive probe or Klicky), on a bed that uses integrated magnets.

That probe, no matter how sensitive, well built or robust, can struggle since there is no fixed “zero” reference point.  The magnets can interfere with the BOM inductive probe, Beacon, etc.  Thermal expansion of the bed or drift in the probe can throw off results. Thrown off too much and your prints will suffer.

Any one of these problems could be frustrating, yet a look at the other Voron printer models offers a method to at least improve things.  On the Trident and 2.4 models, some of these issues are solved by having a fixed endstop AND a probe.  This mod attempts to give this same treatment to the Switchwire.

What do I need?

• Omron D2F microswitch - Qty 1
• M5 3030 T-nuts - Qty 2
• M5x10 screws - Qty 2
• (Optional) 3mm wide thermistor - Qty 1

How to install?

I recommend installing this mod around Z 200mm on the right side of the frame.  In this location, you are close to the Z cable chain but should have some clearance.

For the thermistor and switch wiring, I recommend running the wiring upwards then thru the cable channel, to avoid snagging on any moving parts.

Double check your microswitch can be pressed by the Z rail carriage before you home!!

The configuration changes needed are to remove the “virtual endstop” config line and set the Z endstop position to somewhere around 200 (if you follow my recommendation on placement).  Additionally, I recommend setting the zero reference position to the center of your bed in your bed mesh configuration section so you always have a fixed center point to rely on.

From now on you will need to run z_endstop_calibrate instead of just probe_calibrate, but enjoy what I feel is a more reliable printer!