As result of the work of @m26872 and @GertSanders supported by this community my "need" for a 3D printer is made redundant. The minimal boards like the My Slim 2AA Battery Node and GertSanders "One trick pony" make a housing superfluous.
Some minimal examples here on OpenHardware with 'real' hardware:
![enter image description here](https://www.openhardware.io//uploads/56f4048f5bb2bbd57c6d2bee/image/Std electricity pipe.JPG "enter image title here") ![enter image description here](https://www.openhardware.io//uploads/56f4048f5bb2bbd57c6d2bee/image/Std electricity.JPG "enter image title here")
Standard (3/4 - 19mm) electricity pipe. Also fits a CR123 (3v) battery nicely.
![enter image description here](https://www.openhardware.io//uploads/56f4048f5bb2bbd57c6d2bee/image/Impact resistant.JPG "enter image title here")
Impact resistant (5/8 16mm) pipe (sensor powered by 2AAA/ or 2 'hearing aid' batteries.
An all nature housing in bamboo.
And the ultimate one, no housing. Hidden in the door and door post.
You can cover it with tape and/or paint
all the tools needed:
|Qty||Value||Device||Package||Parts||Description||MF||MPN||Aliexpress or ebay link|
|1||pcs||Very narrow and minimal switch node||custom||https://forum.mysensors.org/topic/3086/very-narrow-and-minim...|
|1||pcs||Door contact/ reed switch||https://www.aliexpress.com/item//2006368350.html|